Output Fault (Overload, Short Circuit, Broken Wire)

What does DIAG_BIT_1 (Channel S) mean?

A diagnostic bit (e.g., Diagnostic bit S for channels 1 through 8) is set to '1' for a digital output channel on modules 750-507 (-508), -522, 753-507, or 750-537. This indicates a general output fault condition such as an overload, a short circuit, or a broken wire affecting the respective output. The specific type of fault requires further investigation.

• Overcurrent condition on the output channel due to excessive load.
• Short circuit between the output terminal and ground or supply voltage.
• Broken wire in the connection between the output terminal and the load.
• Faulty load drawing abnormal current or having an internal short/open.

Click steps to track your progress.

1. 1

   Disconnect the load from the affected output channel.

2. 2

   Measure the resistance of the load to check for open circuit, short circuit, or correct impedance.

3. 3

   Use a multimeter to check the wiring from the output terminal to the load for continuity and insulation to ground or other potentials.

4. 4

   Verify the current rating of the connected load is within the module's specified output current.