Author: PLC Play Ground
HMI Write Succeeded, but Nothing Moved? Success Has Several Layers
A successful tag write confirms a software operation, not necessarily a completed machine action.
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HMI Setpoint Keeps Bouncing? Trace the Bidirectional Binding
A bidirectional binding can write values as well as display them.
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CSV Export Turns 1.5 into Two Columns? Check the Locale Contract
A CSV file can be structurally valid yet import incorrectly when producer and consumer disagree about delimiters or decimal notation.
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Historian Events Arrive Late? Separate Event Time from Arrival Time
A record arriving late does not necessarily describe a late process event.
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Trend Looks Perfect During an Outage? Check the Quality Gaps
A continuous trend line can conceal missing or bad-quality data.
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Alarm Disappeared from the Screen? Check Shelving and Filters
An alarm absent from one display may still be active.
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Audit Log Names a Shared Account? The Missing Identity Matters
An audit trail can record a change without identifying the individual who made it.
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Operator Enters 12.34, but the PLC Gets 12.3? Trace Precision End to End
Displayed decimal places, accepted entry precision, and stored precision can differ.
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Production Count Doubles After a Retry? Give Each Event a Durable Identity
Retrying a database write can duplicate a production event when the first write succeeded but its acknowledgment was lost.
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SCADA Log Stops Overnight? Check Disk Space and Rotation Limits
A logging process can keep running while new records stop reaching disk.
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