Allen-Bradley · Compact 5000 Digital I/O Modules
This boolean tag indicates that a field power loss condition exists on the test channel Testxx. A tag value of '1' signifies that the external 24V DC field power supply for the test channel is not present or has failed, disrupting its operation.
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Verify the 24V DC field power supply connected to the module is energized and producing the correct voltage (e.g., measure 24VDC at the module's field power input terminals).
Check any fuses or reset any circuit breakers associated with the 24V DC field power supply circuit.
Inspect the field power wiring connections to the module for integrity and secure termination.