Safety Output Short Circuit Diagnostic Active

What does Short Circuit diagnostic mean?

A diagnostic value of '1' indicates a general short circuit condition has been detected on a safety output. This can occur due to a short to 24V DC, ground, or between output points, causing the module to fault and turn off the output.

• Output point wiring shorted to 24V DC due to insulation breakdown or incorrect connection.
• Output point wiring shorted to system ground due to insulation breakdown or contact.
• Output points in a pair (e.g., Ptxx and Ptxx+1) shorted to each other.
• 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 output point Ptxx where the fault is detected via Studio 5000 Logix Designer diagnostics.

2. 2

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

3. 3

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

4. 4

   If the output point is part of a paired output, measure resistance between the two output terminals of the pair to check for a short.

5. 5

   If the short circuit was to 24V DC, cycle power to the entire module to reset the diagnostic.