What causes fault code AB-F019 (GuardLogix Safety Signature Mismatch)?

Safety program was edited but not re-validated. Safety signature was recorded incorrectly in safety documentation. Downloaded wrong safety program version. Safety add-on instruction (AOI) was modified

How do I fix fault code AB-F019?

Compare current safety signature to documented approved signature. If program was intentionally modified, complete safety validation per site procedure. If unintentional, reload the approved safety program version from backup. Record new safety signature in safety documentation after validation. Lock safety task after validation to prevent unauthorized changes

GuardLogix Safety Signature Mismatch

AB-F019

GuardLogix safety controller reports safety signature does not match expected value. Safety program may have been modified without validation.

critical allen-bradley

allen-bradley guardlogix safety signature validation

Probable Causes (ranked)

Safety program was edited but not re-validated
Safety signature was recorded incorrectly in safety documentation
Downloaded wrong safety program version
Safety add-on instruction (AOI) was modified

Fix Steps

1 Compare current safety signature to documented approved signature
2 If program was intentionally modified, complete safety validation per site procedure
3 If unintentional, reload the approved safety program version from backup
4 Record new safety signature in safety documentation after validation
5 Lock safety task after validation to prevent unauthorized changes

Field Trick

Safety signature must match what's on the validation document. If it doesn't match, someone changed the safety program. Lock it down and investigate.

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