Safety Test Output Short Circuit Fault

What does Testxx.ShortCircuit mean?

This boolean tag indicates that a short circuit has been detected on the safety test output Testxx. A tag value of '1' means a short circuit is present, and if the output is in Pulse Test or Power Supply mode, it may not be able to be set to a safe state.

• Test output Testxx wiring shorted to 24V DC due to insulation breakdown or incorrect connection.
• Test output Testxx wiring shorted to system ground due to insulation breakdown or contact.
• Test output Testxx wiring shorted to another output or an adjacent signal wire.
• Damage to the field wiring or the connected load causing a low-resistance path.

Click steps to track your progress.

1. 1

   Identify the specific test output Testxx where the fault is detected via Studio 5000 Logix Designer diagnostics.

2. 2

   Examine the physical wiring connected to test output Testxx for any damage, improper termination, or contact that could cause a short to 24V DC or ground.

3. 3

   With power removed from the module and field devices, use a multimeter to measure resistance between the test output terminal Testxx and 24V DC, and between Testxx and system ground; expect an open circuit (high resistance).

4. 4

   If the test output was shorted to 24V DC, cycle power to the entire module to reset the diagnostic.