Author: PLC Play Ground
Vacuum Gripper Works on One Box but Drops Another? Test the Surface
Vacuum gripping depends on the workpiece surface as well as the vacuum source.
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Replacement Solenoid Fits but Fails? Match More Than the Connector
A connector that fits does not prove that a replacement coil is compatible.
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New 5/3 Valve Changes Cylinder Behavior at Rest? Check the Center Symbol
Five ports and three positions do not fully identify a valve function.
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HMI Displays Fahrenheit but Writes Celsius? Test Both Directions
A converted display can look correct while an operator entry writes the wrong units.
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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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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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