Category: Control Systems
Your PID Runs Every Scan—but Is Its Time Setting Telling the Truth?
PID timing errors can make unchanged gains behave differently after a task change.
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Encoder Position Is Exactly Four Times Wrong? Check Quadrature Evaluation
An exact factor-of-two or factor-of-four position error often points to counting conventions.
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PID Says 80%, but the Valve Crawls Behind It? Check Output Tracking
A downstream rate limiter can make the actuator lag behind the PID request.
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Heating and Cooling Fight Near Setpoint? Inspect the Split-Range Crossover
Oscillation near a heating-to-cooling crossover may come from split-range behavior.
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PLC Resends a Command Every Scan? Separate State Entry From State Activity
An action intended once on entering a state can accidentally run throughout that state.
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Two PID Loops Keep Fighting? Check the Inner Loop First
Cascade control depends on a useful inner loop.
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Two PLC Transitions Turn True Together? Decide Which One Wins
A sequence needs a defined outcome when more than one transition is true.
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PID Keeps Overcorrecting Before Anything Happens? Measure Dead Time
A controller can overreact while waiting for a delayed process response.
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PLC Timeout Starts Before the Device Gets the Command? Move the Reference Point
A timeout is meaningful only when its starting event is defined.
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Short Servo Moves Never Reach Full Speed? The Profile Explains Why
A short move may finish before reaching its requested maximum speed.
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