FA-11955 / Discrete control systems / Member archive
A relay forgets its state inside the hysteresis band · case 05
A relay forgets its state inside the hysteresis band.
Case contract
Schmitt relay with low<high: boundary equality switches; open interval retains previous boolean output.
Why this case matters
An offline discrete controller model isolates this state or arithmetic fault; it makes no physical plant or safety claim.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| hold on | false | true | Failed |
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