Author: PLC Play Ground
The Sensor Is Fast but the PLC Reacts Late? Add Up Every Filter
Several modest filters can combine into a significant response delay.
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Servo Hits the Position but Shakes the Machine? Review Jerk
Correct final position does not prove that a motion profile suits the mechanics.
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Alarm Appears on SCADA but Nobody Gets Notified? Trace the Pipeline
An active alarm and a delivered notification are separate outcomes.
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Database Is Back but History Is Still Missing? Inspect Store-and-Forward
Restoring a database connection does not guarantee that queued history has been written successfully.
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Production Report Repeats an Hour? Check Daylight-Saving Time
Local clock labels can repeat during a daylight-saving transition.
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Two Trends Look Identical but Values Differ? Check the Axes
Chart shape alone does not establish equal values or a causal relationship.
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OEE Jumps After a Dashboard Update? Audit the Denominator
An OEE improvement can come from a changed calculation rather than changed production.
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Your FAT Passed Every Normal Cycle? Add the Missing Negative Tests
A successful normal cycle proves only the path that was exercised.
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PLC File Says Final but the Controller Differs? Compare the Evidence
A filename such as final does not establish what is running in the controller.
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The Spare PLC Is the Right Model but Still Unsuitable? Check Compatibility
Matching the catalog number is only part of a replacement plan.
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