FAILURE MAP
← Case archive

FA-91991 / PLC ladder logic scan cycles / Open access

One-shots sharing a storage bit are simulated with private storage · case 01

The simulated program misses the interaction where one instruction consumes the edge for another sharing the same bit.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Storage is keyed by instruction position rather than by the storage tag named in the program.

THE FAILURE

Storage is keyed by instruction position rather than by the storage tag named in the program.

Unsuccessful approach: Keying storage by tag and kind still separates an OSR and OSF that share a bit.

Case contract

One-shot rising (OSR) and one-shot falling (OSF) instructions executed in program order each scan; instrs is a list of [kind, input_tag, storage_tag] and scans a list of {tag: bool} (missing tags are false). Prescan initializes each OSR storage bit true and each OSF storage bit false (later instructions overwrite shared storage), so nothing pulses on the first scan merely because an input is already in its steady state. OSR pulses when input is true and storage false; OSF pulses when storage is true and input false; the storage bit is then set to the input. Instructions that share a storage tag share its state. Return the pulse list per scan.

Why this case matters

Ladder programs are executed as repeated scans; each defect here changes what a rung, timer, counter or data-table instruction reports on a particular scan, which is how commissioning and field faults are actually observed.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(instrs, scans):
    store = {}
    for j, (kind, tag, st) in enumerate(instrs):
        store[j] = kind != 'OSF'
    out = []
    for inputs in scans:
        pulses = []
        for st, (kind, tag, _st) in enumerate(instrs):
            cur = bool(inputs.get(tag, False))
            if kind == 'OSF':
                pulse = store[st] and not cur
            else:
                pulse = cur and not store[st]
            store[st] = cur
            pulses.append(pulse)
        out.append(pulses)
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['regression: shared storage',
   [[['OSR', 'I:0', 'B:10'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': True}, {'I:0': False, 'I:1': True}, {'I:1': True}, {}]],
   [[False, False], [False, True], [False, True], [False, False]]],
  ['regression: scenario 4',
   [[['OSF', 'B:3', 'B:12'], ['OSF', 'B:3', 'B:12'], ['OSR', 'I:0', 'B:11'], ['OSR', 'B:3', 'B:12']],
    [{'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': True},
     {'I:0': False, 'I:1': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': True}]],
   [[True, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [True, False, True, False],
    [False, False, False, False],
    [False, False, True, False],
    [False, False, False, False]]],
  ['control: input on at power-up',
   [[['OSR', 'I:0', 'B:10'], ['OSF', 'I:1', 'B:11']],
    [{'I:0': True}, {'I:0': True}, {'I:0': False}, {'I:0': True, 'I:1': True}, {}]],
   [[False, False], [False, False], [False, False], [True, False], [False, True]]],
  ['control: falling edge train',
   [[['OSF', 'I:0', 'B:12']],
    [{'I:0': True}, {'I:0': False}, {'I:0': False}, {'I:0': True}, {'I:0': False}, {}]],
   [[False], [True], [False], [False], [True], [False]]],
  ['regression: scenario 1',
   [[['OSR', 'I:1', 'B:10'], ['OSR', 'I:1', 'B:10'], ['OSF', 'B:3', 'B:12']],
    [{'B:3': False},
     {'I:0': False, 'I:1': True},
     {'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': False},
     {'I:0': True, 'I:1': True, 'B:3': True}]],
   [[False, False, False],
    [True, False, False],
    [False, False, False],
    [False, False, False],
    [True, False, False],
    [False, False, False],
    [False, False, True],
    [True, False, False]]],
  ['control: scenario 2',
   [[['OSF', 'I:1', 'B:13'], ['OSF', 'B:3', 'B:10']],
    [{'I:0': True, 'B:3': False},
     {'I:0': False, 'B:3': False},
     {'I:1': True, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:1': False, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': True}]],
   [[False, False], [False, False], [False, False], [False, True], [True, False], [False, False]]],
  ['regression: scenario 3',
   [[['OSF', 'I:0', 'B:12'], ['OSF', 'B:3', 'B:12']],
    [{'I:0': True, 'I:1': True},
     {'I:1': False, 'B:3': True},
     {'I:1': False},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': False, 'B:3': False}]],
   [[False, True], [False, False], [True, False], [False, False], [False, False]]],
  ['control: scenario 5',
   [[['OSR', 'I:0', 'B:10'], ['OSF', 'B:3', 'B:12']],
    [{'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': True}]],
   [[False, False], [False, False], [False, False], [False, False], [False, False]]]],
 [['regression: scenario 2',
   [[['OSR', 'I:1', 'B:11'], ['OSR', 'I:0', 'B:11']],
    [{'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False},
     {'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': False},
     {'I:0': False},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': True}]],
   [[False, False],
    [False, False],
    [False, True],
    [False, False],
    [False, False],
    [False, False],
    [False, True],
    [False, False]]],
  ['regression: scenario 4',
   [[['OSF', 'B:3', 'B:12'], ['OSR', 'B:3', 'B:12'], ['OSR', 'I:0', 'B:10']],
    [{'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': False},
     {'I:0': False, 'I:1': True},
     {'I:0': True, 'I:1': True, 'B:3': False}]],
   [[True, False, False],
    [False, False, True],
    [False, False, False],
    [False, False, False],
    [False, False, True]]],
  ['control: input on at power-up',
   [[['OSR', 'I:0', 'B:10'], ['OSF', 'I:1', 'B:11']],
    [{'I:0': True}, {'I:0': True}, {'I:0': False}, {'I:0': True, 'I:1': True}, {}]],
   [[False, False], [False, False], [False, False], [True, False], [False, True]]],
  ['regression: shared storage',
   [[['OSR', 'I:0', 'B:10'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': True}, {'I:0': False, 'I:1': True}, {'I:1': True}, {}]],
   [[False, False], [False, True], [False, True], [False, False]]],
  ['control: falling edge train',
   [[['OSF', 'I:0', 'B:12']],
    [{'I:0': True}, {'I:0': False}, {'I:0': False}, {'I:0': True}, {'I:0': False}, {}]],
   [[False], [True], [False], [False], [True], [False]]],
  ['control: scenario 1',
   [[['OSF', 'B:3', 'B:11'], ['OSR', 'B:3', 'B:10']],
    [{'I:0': False, 'B:3': True},
     {'I:0': True, 'I:1': True},
     {'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': False}]],
   [[False, False], [True, False], [False, False], [False, False], [False, False], [False, False]]],
  ['regression: scenario 3',
   [[['OSR', 'I:0', 'B:11'], ['OSF', 'I:0', 'B:12'], ['OSR', 'I:1', 'B:13'], ['OSR', 'I:0', 'B:12']],
    [{'I:0': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:1': True},
     {'I:0': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': True}]],
   [[False, False, False, False],
    [False, False, True, False],
    [False, True, False, False],
    [False, False, True, False],
    [True, False, False, False],
    [False, True, True, False]]],
  ['regression: scenario 5',
   [[['OSF', 'B:3', 'B:13'], ['OSF', 'I:1', 'B:13']],
    [{'I:0': False, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': False, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': False, 'B:3': False},
     {'I:1': True, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:1': False, 'B:3': True},
     {'I:1': False, 'B:3': True}]],
   [[False, False],
    [False, False],
    [False, True],
    [False, False],
    [True, False],
    [True, False],
    [False, False],
    [True, False],
    [False, True],
    [False, True]]]],
 [['regression: scenario 2',
   [[['OSF', 'I:1', 'B:11'], ['OSF', 'B:3', 'B:10'], ['OSF', 'I:0', 'B:10'], ['OSF', 'I:1', 'B:10']],
    [{'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': True},
     {'I:0': False, 'B:3': True},
     {'I:1': False}]],
   [[False, False, False, False],
    [False, False, False, False],
    [False, False, True, False],
    [False, False, False, False],
    [True, False, True, False],
    [False, False, False, False]]],
  ['regression: scenario 13',
   [[['OSF', 'I:0', 'B:12'], ['OSF', 'I:0', 'B:12'], ['OSR', 'B:3', 'B:12'], ['OSF', 'I:0', 'B:10']],
    [{'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': True, 'I:1': True},
     {'I:0': False, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': False}]],
   [[True, False, False, False],
    [False, False, True, False],
    [False, False, False, False],
    [False, False, False, True],
    [False, False, False, False]]],
  ['control: input on at power-up',
   [[['OSR', 'I:0', 'B:10'], ['OSF', 'I:1', 'B:11']],
    [{'I:0': True}, {'I:0': True}, {'I:0': False}, {'I:0': True, 'I:1': True}, {}]],
   [[False, False], [False, False], [False, False], [True, False], [False, True]]],
  ['regression: shared storage',
   [[['OSR', 'I:0', 'B:10'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': True}, {'I:0': False, 'I:1': True}, {'I:1': True}, {}]],
   [[False, False], [False, True], [False, True], [False, False]]],
  ['control: falling edge train',
   [[['OSF', 'I:0', 'B:12']],
    [{'I:0': True}, {'I:0': False}, {'I:0': False}, {'I:0': True}, {'I:0': False}, {}]],
   [[False], [True], [False], [False], [True], [False]]],
  ['regression: scenario 1',
   [[['OSF', 'B:3', 'B:12'], ['OSR', 'I:1', 'B:13'], ['OSR', 'I:1', 'B:12']],
    [{'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': False},
     {'I:0': True},
     {'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'B:3': True},
     {'I:1': True, 'B:3': True},
     {'I:1': True}]],
   [[False, False, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [False, True, False],
    [True, False, True]]],
  ['regression: scenario 3',
   [[['OSR', 'I:0', 'B:13'], ['OSR', 'I:0', 'B:11'], ['OSF', 'B:3', 'B:10'], ['OSF', 'B:3', 'B:10']],
    [{'I:1': True, 'B:3': False},
     {'I:0': True, 'B:3': True},
     {'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': True},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': False},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': False}]],
   [[False, False, False, False],
    [True, True, False, False],
    [False, False, True, False],
    [True, True, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [True, True, False, False],
    [False, False, False, False]]],
  ['control: scenario 4',
   [[['OSF', 'B:3', 'B:11'], ['OSF', 'I:0', 'B:13'], ['OSR', 'I:1', 'B:12']],
    [{'I:0': False, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'B:3': True},
     {'I:1': True},
     {'I:0': True, 'I:1': True, 'B:3': False}]],
   [[False, False, False],
    [False, False, True],
    [False, True, False],
    [True, False, True],
    [False, False, False]]]],
 [['regression: scenario 4',
   [[['OSF', 'B:3', 'B:13'], ['OSF', 'I:0', 'B:11'], ['OSR', 'I:1', 'B:13'], ['OSR', 'I:0', 'B:10']],
    [{'I:0': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'I:1': False},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'B:3': True},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': False, 'B:3': False},
     {'I:0': False, 'B:3': False},
     {'I:0': False}]],
   [[True, False, False, False],
    [False, False, True, True],
    [True, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, True, False, False],
    [True, False, False, False],
    [False, False, False, False],
    [False, False, False, False]]],
  ['regression: scenario 14',
   [[['OSF', 'B:3', 'B:11'], ['OSF', 'B:3', 'B:13'], ['OSR', 'B:3', 'B:13']],
    [{'I:0': False, 'I:1': True, 'B:3': True},
     {'I:1': False, 'B:3': False},
     {'I:0': True, 'I:1': True},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'B:3': True},
     {'I:0': True, 'I:1': False},
     {'I:0': False, 'I:1': True, 'B:3': False}]],
   [[False, False, False],
    [True, True, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [True, True, False],
    [False, False, False]]],
  ['control: input on at power-up',
   [[['OSR', 'I:0', 'B:10'], ['OSF', 'I:1', 'B:11']],
    [{'I:0': True}, {'I:0': True}, {'I:0': False}, {'I:0': True, 'I:1': True}, {}]],
   [[False, False], [False, False], [False, False], [True, False], [False, True]]],
  ['regression: shared storage',
   [[['OSR', 'I:0', 'B:10'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': True}, {'I:0': False, 'I:1': True}, {'I:1': True}, {}]],
   [[False, False], [False, True], [False, True], [False, False]]],
  ['control: falling edge train',
   [[['OSF', 'I:0', 'B:12']],
    [{'I:0': True}, {'I:0': False}, {'I:0': False}, {'I:0': True}, {'I:0': False}, {}]],
   [[False], [True], [False], [False], [True], [False]]],
  ['regression: scenario 1',
   [[['OSR', 'I:0', 'B:10'], ['OSR', 'I:0', 'B:13'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': True},
     {'I:1': False},
     {'I:0': False, 'I:1': False}]],
   [[False, False, False],
    [True, True, False],
    [False, False, False],
    [False, False, True],
    [False, True, False],
    [True, False, False],
    [False, False, False],
    [False, False, False]]],
  ['control: scenario 2',
   [[['OSR', 'I:1', 'B:11'], ['OSR', 'I:1', 'B:12'], ['OSR', 'I:0', 'B:13'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': True}]],
   [[False, False, False, False],
    [False, False, True, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, True, False]]],
  ['regression: scenario 3',
   [[['OSF', 'I:1', 'B:10'], ['OSR', 'I:1', 'B:10'], ['OSF', 'B:3', 'B:11'], ['OSR', 'I:0', 'B:11']],
    [{'I:0': True, 'B:3': False},
     {'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False},
     {'I:0': False, 'B:3': False},
     {'I:1': True, 'B:3': False},
     {'I:0': False, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'B:3': False}]],
   [[True, False, True, True],
    [False, False, True, False],
    [True, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [True, False, False, False],
    [False, False, False, True],
    [True, False, True, False]]]],
 [['regression: scenario 9',
   [[['OSR', 'B:3', 'B:10'], ['OSR', 'B:3', 'B:13'], ['OSR', 'I:0', 'B:12'], ['OSF', 'I:1', 'B:12']],
    [{'I:0': False, 'I:1': False},
     {'I:1': True},
     {'I:0': True, 'B:3': False},
     {'I:0': False, 'I:1': True},
     {'I:0': False, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': True},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': False}]],
   [[False, False, False, False],
    [False, False, False, False],
    [False, False, False, True],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [True, True, False, True],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, False, False]]],
  ['regression: scenario 21',
   [[['OSF', 'B:3', 'B:10'], ['OSR', 'I:1', 'B:12'], ['OSR', 'I:0', 'B:13'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': True, 'I:1': True},
     {'I:1': True, 'B:3': False},
     {'B:3': True},
     {'I:0': True, 'B:3': False},
     {'I:0': False, 'I:1': False},
     {'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False},
     {'I:0': True, 'I:1': True, 'B:3': True}]],
   [[True, False, False, True],
    [True, False, False, True],
    [False, False, False, False],
    [False, False, True, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, True, True, False]]],
  ['control: input on at power-up',
   [[['OSR', 'I:0', 'B:10'], ['OSF', 'I:1', 'B:11']],
    [{'I:0': True}, {'I:0': True}, {'I:0': False}, {'I:0': True, 'I:1': True}, {}]],
   [[False, False], [False, False], [False, False], [True, False], [False, True]]],
  ['regression: shared storage',
   [[['OSR', 'I:0', 'B:10'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': True}, {'I:0': False, 'I:1': True}, {'I:1': True}, {}]],
   [[False, False], [False, True], [False, True], [False, False]]],
  ['control: falling edge train',
   [[['OSF', 'I:0', 'B:12']],
    [{'I:0': True}, {'I:0': False}, {'I:0': False}, {'I:0': True}, {'I:0': False}, {}]],
   [[False], [True], [False], [False], [True], [False]]],
  ['control: scenario 1',
   [[['OSF', 'I:1', 'B:12'], ['OSR', 'B:3', 'B:11'], ['OSR', 'I:0', 'B:13'], ['OSR', 'I:0', 'B:11']],
    [{'I:0': True, 'I:1': True, 'B:3': True},
     {'I:1': False, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': False},
     {'B:3': True}]],
   [[False, False, False, False],
    [True, False, False, False],
    [False, False, True, True],
    [True, False, False, False],
    [False, True, False, False]]],
  ['regression: scenario 2',
   [[['OSF', 'I:0', 'B:13'], ['OSF', 'B:3', 'B:10'], ['OSF', 'B:3', 'B:10'], ['OSF', 'B:3', 'B:10']],
    [{'I:0': True, 'I:1': False},
     {'B:3': False},
     {'I:1': False},
     {'B:3': True},
     {'I:0': False, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:1': False, 'B:3': False},
     {'I:0': False, 'B:3': True}]],
   [[False, False, False, False],
    [True, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, True, False, False],
    [False, False, False, False],
    [False, True, False, False],
    [True, False, False, False],
    [False, True, False, False],
    [False, False, False, False]]],
  ['control: scenario 3',
   [[['OSR', 'I:1', 'B:11'], ['OSF', 'I:1', 'B:12']],
    [{'I:0': False, 'I:1': False, 'B:3': False},
     {'I:1': True, 'B:3': True},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': True},
     {'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': True},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': True}]],
   [[False, False],
    [True, False],
    [False, False],
    [False, False],
    [False, True],
    [False, False],
    [True, False],
    [False, False],
    [False, True]]]]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
regression: shared storage[[False, False], [False, True], [False, False], [False, False]][[False, False], [False, True], [False, True], [False, False]]Failed
regression: scenario 4[[False, False, False, False], [False, False, False, False], [False, False, False, True], [True, True, True, False], [False, False, False, False], [False, False, True, False], [False, False, False, True]][[True, False, False, False], [False, False, False, False], [False, False, False, False], [True, False, True, False], [False, False, False, False], [False, False, True, False], [False, False, False, False]]Failed
control: input on at power-up[[False, False], [False, False], [False, False], [True, False], [False, True]][[False, False], [False, False], [False, False], [True, False], [False, True]]Passed
control: falling edge train[[False], [True], [False], [False], [True], [False]][[False], [True], [False], [False], [True], [False]]Passed
regression: scenario 1[[False, False, False], [True, True, False], [False, False, False], [False, False, False], [True, True, False], [False, False, False], [False, False, True], [True, True, False]][[False, False, False], [True, False, False], [False, False, False], [False, False, False], [True, False, False], [False, False, False], [False, False, True], [True, False, False]]Failed
control: scenario 2[[False, False], [False, False], [False, False], [False, True], [True, False], [False, False]][[False, False], [False, False], [False, False], [False, True], [True, False], [False, False]]Passed
regression: scenario 3[[False, False], [True, False], [False, True], [False, False], [False, False]][[False, True], [False, False], [True, False], [False, False], [False, False]]Failed
control: scenario 5[[False, False], [False, False], [False, False], [False, False], [False, False]][[False, False], [False, False], [False, False], [False, False], [False, False]]Passed

SHA-256 / e003ac1a60d054dea951318855f54b3448bd264b5d3b0c31286ccf031ef0d52b

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(instrs, scans):
    store = {}
    for kind, tag, st in instrs:
        store[(st, kind)] = kind != 'OSF'
    out = []
    for inputs in scans:
        pulses = []
        for kind, tag, _st in instrs:
            st = (_st, kind)
            cur = bool(inputs.get(tag, False))
            if kind == 'OSF':
                pulse = store[st] and not cur
            else:
                pulse = cur and not store[st]
            store[st] = cur
            pulses.append(pulse)
        out.append(pulses)
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['regression: shared storage',
   [[['OSR', 'I:0', 'B:10'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': True}, {'I:0': False, 'I:1': True}, {'I:1': True}, {}]],
   [[False, False], [False, True], [False, True], [False, False]]],
  ['regression: scenario 4',
   [[['OSF', 'B:3', 'B:12'], ['OSF', 'B:3', 'B:12'], ['OSR', 'I:0', 'B:11'], ['OSR', 'B:3', 'B:12']],
    [{'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': True},
     {'I:0': False, 'I:1': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': True}]],
   [[True, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [True, False, True, False],
    [False, False, False, False],
    [False, False, True, False],
    [False, False, False, False]]],
  ['control: input on at power-up',
   [[['OSR', 'I:0', 'B:10'], ['OSF', 'I:1', 'B:11']],
    [{'I:0': True}, {'I:0': True}, {'I:0': False}, {'I:0': True, 'I:1': True}, {}]],
   [[False, False], [False, False], [False, False], [True, False], [False, True]]],
  ['control: falling edge train',
   [[['OSF', 'I:0', 'B:12']],
    [{'I:0': True}, {'I:0': False}, {'I:0': False}, {'I:0': True}, {'I:0': False}, {}]],
   [[False], [True], [False], [False], [True], [False]]],
  ['regression: scenario 1',
   [[['OSR', 'I:1', 'B:10'], ['OSR', 'I:1', 'B:10'], ['OSF', 'B:3', 'B:12']],
    [{'B:3': False},
     {'I:0': False, 'I:1': True},
     {'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': False},
     {'I:0': True, 'I:1': True, 'B:3': True}]],
   [[False, False, False],
    [True, False, False],
    [False, False, False],
    [False, False, False],
    [True, False, False],
    [False, False, False],
    [False, False, True],
    [True, False, False]]],
  ['control: scenario 2',
   [[['OSF', 'I:1', 'B:13'], ['OSF', 'B:3', 'B:10']],
    [{'I:0': True, 'B:3': False},
     {'I:0': False, 'B:3': False},
     {'I:1': True, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:1': False, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': True}]],
   [[False, False], [False, False], [False, False], [False, True], [True, False], [False, False]]],
  ['regression: scenario 3',
   [[['OSF', 'I:0', 'B:12'], ['OSF', 'B:3', 'B:12']],
    [{'I:0': True, 'I:1': True},
     {'I:1': False, 'B:3': True},
     {'I:1': False},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': False, 'B:3': False}]],
   [[False, True], [False, False], [True, False], [False, False], [False, False]]],
  ['control: scenario 5',
   [[['OSR', 'I:0', 'B:10'], ['OSF', 'B:3', 'B:12']],
    [{'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': True}]],
   [[False, False], [False, False], [False, False], [False, False], [False, False]]]],
 [['regression: scenario 2',
   [[['OSR', 'I:1', 'B:11'], ['OSR', 'I:0', 'B:11']],
    [{'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False},
     {'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': False},
     {'I:0': False},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': True}]],
   [[False, False],
    [False, False],
    [False, True],
    [False, False],
    [False, False],
    [False, False],
    [False, True],
    [False, False]]],
  ['regression: scenario 4',
   [[['OSF', 'B:3', 'B:12'], ['OSR', 'B:3', 'B:12'], ['OSR', 'I:0', 'B:10']],
    [{'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': False},
     {'I:0': False, 'I:1': True},
     {'I:0': True, 'I:1': True, 'B:3': False}]],
   [[True, False, False],
    [False, False, True],
    [False, False, False],
    [False, False, False],
    [False, False, True]]],
  ['control: input on at power-up',
   [[['OSR', 'I:0', 'B:10'], ['OSF', 'I:1', 'B:11']],
    [{'I:0': True}, {'I:0': True}, {'I:0': False}, {'I:0': True, 'I:1': True}, {}]],
   [[False, False], [False, False], [False, False], [True, False], [False, True]]],
  ['regression: shared storage',
   [[['OSR', 'I:0', 'B:10'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': True}, {'I:0': False, 'I:1': True}, {'I:1': True}, {}]],
   [[False, False], [False, True], [False, True], [False, False]]],
  ['control: falling edge train',
   [[['OSF', 'I:0', 'B:12']],
    [{'I:0': True}, {'I:0': False}, {'I:0': False}, {'I:0': True}, {'I:0': False}, {}]],
   [[False], [True], [False], [False], [True], [False]]],
  ['control: scenario 1',
   [[['OSF', 'B:3', 'B:11'], ['OSR', 'B:3', 'B:10']],
    [{'I:0': False, 'B:3': True},
     {'I:0': True, 'I:1': True},
     {'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': False}]],
   [[False, False], [True, False], [False, False], [False, False], [False, False], [False, False]]],
  ['regression: scenario 3',
   [[['OSR', 'I:0', 'B:11'], ['OSF', 'I:0', 'B:12'], ['OSR', 'I:1', 'B:13'], ['OSR', 'I:0', 'B:12']],
    [{'I:0': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:1': True},
     {'I:0': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': True}]],
   [[False, False, False, False],
    [False, False, True, False],
    [False, True, False, False],
    [False, False, True, False],
    [True, False, False, False],
    [False, True, True, False]]],
  ['regression: scenario 5',
   [[['OSF', 'B:3', 'B:13'], ['OSF', 'I:1', 'B:13']],
    [{'I:0': False, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': False, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': False, 'B:3': False},
     {'I:1': True, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:1': False, 'B:3': True},
     {'I:1': False, 'B:3': True}]],
   [[False, False],
    [False, False],
    [False, True],
    [False, False],
    [True, False],
    [True, False],
    [False, False],
    [True, False],
    [False, True],
    [False, True]]]],
 [['regression: scenario 2',
   [[['OSF', 'I:1', 'B:11'], ['OSF', 'B:3', 'B:10'], ['OSF', 'I:0', 'B:10'], ['OSF', 'I:1', 'B:10']],
    [{'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': True},
     {'I:0': False, 'B:3': True},
     {'I:1': False}]],
   [[False, False, False, False],
    [False, False, False, False],
    [False, False, True, False],
    [False, False, False, False],
    [True, False, True, False],
    [False, False, False, False]]],
  ['regression: scenario 13',
   [[['OSF', 'I:0', 'B:12'], ['OSF', 'I:0', 'B:12'], ['OSR', 'B:3', 'B:12'], ['OSF', 'I:0', 'B:10']],
    [{'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': True, 'I:1': True},
     {'I:0': False, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': False}]],
   [[True, False, False, False],
    [False, False, True, False],
    [False, False, False, False],
    [False, False, False, True],
    [False, False, False, False]]],
  ['control: input on at power-up',
   [[['OSR', 'I:0', 'B:10'], ['OSF', 'I:1', 'B:11']],
    [{'I:0': True}, {'I:0': True}, {'I:0': False}, {'I:0': True, 'I:1': True}, {}]],
   [[False, False], [False, False], [False, False], [True, False], [False, True]]],
  ['regression: shared storage',
   [[['OSR', 'I:0', 'B:10'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': True}, {'I:0': False, 'I:1': True}, {'I:1': True}, {}]],
   [[False, False], [False, True], [False, True], [False, False]]],
  ['control: falling edge train',
   [[['OSF', 'I:0', 'B:12']],
    [{'I:0': True}, {'I:0': False}, {'I:0': False}, {'I:0': True}, {'I:0': False}, {}]],
   [[False], [True], [False], [False], [True], [False]]],
  ['regression: scenario 1',
   [[['OSF', 'B:3', 'B:12'], ['OSR', 'I:1', 'B:13'], ['OSR', 'I:1', 'B:12']],
    [{'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': False},
     {'I:0': True},
     {'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'B:3': True},
     {'I:1': True, 'B:3': True},
     {'I:1': True}]],
   [[False, False, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [False, True, False],
    [True, False, True]]],
  ['regression: scenario 3',
   [[['OSR', 'I:0', 'B:13'], ['OSR', 'I:0', 'B:11'], ['OSF', 'B:3', 'B:10'], ['OSF', 'B:3', 'B:10']],
    [{'I:1': True, 'B:3': False},
     {'I:0': True, 'B:3': True},
     {'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': True},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': False},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': False}]],
   [[False, False, False, False],
    [True, True, False, False],
    [False, False, True, False],
    [True, True, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [True, True, False, False],
    [False, False, False, False]]],
  ['control: scenario 4',
   [[['OSF', 'B:3', 'B:11'], ['OSF', 'I:0', 'B:13'], ['OSR', 'I:1', 'B:12']],
    [{'I:0': False, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'B:3': True},
     {'I:1': True},
     {'I:0': True, 'I:1': True, 'B:3': False}]],
   [[False, False, False],
    [False, False, True],
    [False, True, False],
    [True, False, True],
    [False, False, False]]]],
 [['regression: scenario 4',
   [[['OSF', 'B:3', 'B:13'], ['OSF', 'I:0', 'B:11'], ['OSR', 'I:1', 'B:13'], ['OSR', 'I:0', 'B:10']],
    [{'I:0': False},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'I:1': False},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'B:3': True},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': False, 'B:3': False},
     {'I:0': False, 'B:3': False},
     {'I:0': False}]],
   [[True, False, False, False],
    [False, False, True, True],
    [True, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, True, False, False],
    [True, False, False, False],
    [False, False, False, False],
    [False, False, False, False]]],
  ['regression: scenario 14',
   [[['OSF', 'B:3', 'B:11'], ['OSF', 'B:3', 'B:13'], ['OSR', 'B:3', 'B:13']],
    [{'I:0': False, 'I:1': True, 'B:3': True},
     {'I:1': False, 'B:3': False},
     {'I:0': True, 'I:1': True},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'B:3': True},
     {'I:0': True, 'I:1': False},
     {'I:0': False, 'I:1': True, 'B:3': False}]],
   [[False, False, False],
    [True, True, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [False, False, False],
    [True, True, False],
    [False, False, False]]],
  ['control: input on at power-up',
   [[['OSR', 'I:0', 'B:10'], ['OSF', 'I:1', 'B:11']],
    [{'I:0': True}, {'I:0': True}, {'I:0': False}, {'I:0': True, 'I:1': True}, {}]],
   [[False, False], [False, False], [False, False], [True, False], [False, True]]],
  ['regression: shared storage',
   [[['OSR', 'I:0', 'B:10'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': True}, {'I:0': False, 'I:1': True}, {'I:1': True}, {}]],
   [[False, False], [False, True], [False, True], [False, False]]],
  ['control: falling edge train',
   [[['OSF', 'I:0', 'B:12']],
    [{'I:0': True}, {'I:0': False}, {'I:0': False}, {'I:0': True}, {'I:0': False}, {}]],
   [[False], [True], [False], [False], [True], [False]]],
  ['regression: scenario 1',
   [[['OSR', 'I:0', 'B:10'], ['OSR', 'I:0', 'B:13'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': True},
     {'I:1': False},
     {'I:0': False, 'I:1': False}]],
   [[False, False, False],
    [True, True, False],
    [False, False, False],
    [False, False, True],
    [False, True, False],
    [True, False, False],
    [False, False, False],
    [False, False, False]]],
  ['control: scenario 2',
   [[['OSR', 'I:1', 'B:11'], ['OSR', 'I:1', 'B:12'], ['OSR', 'I:0', 'B:13'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': True}]],
   [[False, False, False, False],
    [False, False, True, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, True, False]]],
  ['regression: scenario 3',
   [[['OSF', 'I:1', 'B:10'], ['OSR', 'I:1', 'B:10'], ['OSF', 'B:3', 'B:11'], ['OSR', 'I:0', 'B:11']],
    [{'I:0': True, 'B:3': False},
     {'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False},
     {'I:0': False, 'B:3': False},
     {'I:1': True, 'B:3': False},
     {'I:0': False, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'B:3': False}]],
   [[True, False, True, True],
    [False, False, True, False],
    [True, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [True, False, False, False],
    [False, False, False, True],
    [True, False, True, False]]]],
 [['regression: scenario 9',
   [[['OSR', 'B:3', 'B:10'], ['OSR', 'B:3', 'B:13'], ['OSR', 'I:0', 'B:12'], ['OSF', 'I:1', 'B:12']],
    [{'I:0': False, 'I:1': False},
     {'I:1': True},
     {'I:0': True, 'B:3': False},
     {'I:0': False, 'I:1': True},
     {'I:0': False, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': True},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': False}]],
   [[False, False, False, False],
    [False, False, False, False],
    [False, False, False, True],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [True, True, False, True],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, False, False]]],
  ['regression: scenario 21',
   [[['OSF', 'B:3', 'B:10'], ['OSR', 'I:1', 'B:12'], ['OSR', 'I:0', 'B:13'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': True, 'I:1': True},
     {'I:1': True, 'B:3': False},
     {'B:3': True},
     {'I:0': True, 'B:3': False},
     {'I:0': False, 'I:1': False},
     {'I:1': False, 'B:3': False},
     {'I:0': False, 'I:1': False},
     {'I:0': True, 'I:1': True, 'B:3': True}]],
   [[True, False, False, True],
    [True, False, False, True],
    [False, False, False, False],
    [False, False, True, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, True, True, False]]],
  ['control: input on at power-up',
   [[['OSR', 'I:0', 'B:10'], ['OSF', 'I:1', 'B:11']],
    [{'I:0': True}, {'I:0': True}, {'I:0': False}, {'I:0': True, 'I:1': True}, {}]],
   [[False, False], [False, False], [False, False], [True, False], [False, True]]],
  ['regression: shared storage',
   [[['OSR', 'I:0', 'B:10'], ['OSR', 'I:1', 'B:10']],
    [{'I:0': True}, {'I:0': False, 'I:1': True}, {'I:1': True}, {}]],
   [[False, False], [False, True], [False, True], [False, False]]],
  ['control: falling edge train',
   [[['OSF', 'I:0', 'B:12']],
    [{'I:0': True}, {'I:0': False}, {'I:0': False}, {'I:0': True}, {'I:0': False}, {}]],
   [[False], [True], [False], [False], [True], [False]]],
  ['control: scenario 1',
   [[['OSF', 'I:1', 'B:12'], ['OSR', 'B:3', 'B:11'], ['OSR', 'I:0', 'B:13'], ['OSR', 'I:0', 'B:11']],
    [{'I:0': True, 'I:1': True, 'B:3': True},
     {'I:1': False, 'B:3': True},
     {'I:0': True, 'I:1': True, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': False},
     {'B:3': True}]],
   [[False, False, False, False],
    [True, False, False, False],
    [False, False, True, True],
    [True, False, False, False],
    [False, True, False, False]]],
  ['regression: scenario 2',
   [[['OSF', 'I:0', 'B:13'], ['OSF', 'B:3', 'B:10'], ['OSF', 'B:3', 'B:10'], ['OSF', 'B:3', 'B:10']],
    [{'I:0': True, 'I:1': False},
     {'B:3': False},
     {'I:1': False},
     {'B:3': True},
     {'I:0': False, 'B:3': False},
     {'I:0': False, 'I:1': False, 'B:3': True},
     {'I:0': True, 'B:3': False},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:1': False, 'B:3': False},
     {'I:0': False, 'B:3': True}]],
   [[False, False, False, False],
    [True, False, False, False],
    [False, False, False, False],
    [False, False, False, False],
    [False, True, False, False],
    [False, False, False, False],
    [False, True, False, False],
    [True, False, False, False],
    [False, True, False, False],
    [False, False, False, False]]],
  ['control: scenario 3',
   [[['OSR', 'I:1', 'B:11'], ['OSF', 'I:1', 'B:12']],
    [{'I:0': False, 'I:1': False, 'B:3': False},
     {'I:1': True, 'B:3': True},
     {'I:0': False, 'I:1': True, 'B:3': False},
     {'I:0': True, 'I:1': True, 'B:3': True},
     {'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': True, 'I:1': False, 'B:3': True},
     {'I:0': False, 'I:1': True},
     {'I:0': False, 'I:1': True, 'B:3': True},
     {'I:0': True}]],
   [[False, False],
    [True, False],
    [False, False],
    [False, False],
    [False, True],
    [False, False],
    [True, False],
    [False, False],
    [False, True]]]]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
regression: shared storage[[False, False], [False, True], [False, True], [False, False]][[False, False], [False, True], [False, True], [False, False]]Passed
regression: scenario 4[[False, False, False, False], [False, False, False, False], [False, False, False, True], [True, False, True, False], [False, False, False, False], [False, False, True, False], [False, False, False, True]][[True, False, False, False], [False, False, False, False], [False, False, False, False], [True, False, True, False], [False, False, False, False], [False, False, True, False], [False, False, False, False]]Failed
control: input on at power-up[[False, False], [False, False], [False, False], [True, False], [False, True]][[False, False], [False, False], [False, False], [True, False], [False, True]]Passed
control: falling edge train[[False], [True], [False], [False], [True], [False]][[False], [True], [False], [False], [True], [False]]Passed
regression: scenario 1[[False, False, False], [True, False, False], [False, False, False], [False, False, False], [True, False, False], [False, False, False], [False, False, True], [True, False, False]][[False, False, False], [True, False, False], [False, False, False], [False, False, False], [True, False, False], [False, False, False], [False, False, True], [True, False, False]]Passed
control: scenario 2[[False, False], [False, False], [False, False], [False, True], [True, False], [False, False]][[False, False], [False, False], [False, False], [False, True], [True, False], [False, False]]Passed
regression: scenario 3[[False, True], [False, False], [True, False], [False, False], [False, False]][[False, True], [False, False], [True, False], [False, False], [False, False]]Passed
control: scenario 5[[False, False], [False, False], [False, False], [False, False], [False, False]][[False, False], [False, False], [False, False], [False, False], [False, False]]Passed

SHA-256 / 34ae717913dc49e1dd3a13534ff6e57269598534195d0537f8868c11c3e33c30

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 8 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

Member access is invitation-based. Sign in with your invited account to inspect the repair.

Sign in to the archive ↗

Verification & scope

A deterministic bounded teaching model of one PLC instruction or rung pattern evaluated scan by scan. The stated contract is a stipulated toy convention, not a claim of conformance to any vendor controller or IEC 61131-3 runtime. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:51:41.634832+00:00.

Case digest / 884243ac1430f232f786c3fab2e4de7f46e7a2792d217a3cf7c405e90bc5f6bb