Category: Control Systems
Pause, Stop, and Abort Share One Button Path? Review Recovery Behavior
Different interruption commands can require different recovery paths.
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Position Trigger Works Slowly but Vanishes at Speed? Check the Window
A narrow software position window can be crossed entirely between PLC evaluations.
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PLC Runs a Fresh Batch With an Old Completion Flag? Add Transaction Identity
A completion bit left over from earlier work can incorrectly finish a new transaction.
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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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Machine Skips Several Steps in One Scan? Inspect State Assignment Order
A sequence may advance through several states during one task execution if later logic sees earlier state assignments immediately.
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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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PLC Parallel Branch Waits Forever? Define the Join Condition
Parallel actions need a precise rule for joining again.
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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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PLC Recovery Retries Forever? Put a Budget on Automatic Attempts
Automatic retries need a defined stopping condition.
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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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