Discrepancy Time Expired

What does 3 mean?

This error occurs when the configured discrepancy time for inputs has been exceeded. This typically indicates a mismatch or delay in signals from redundant input channels, suggesting a sensor or wiring issue, or an incorrectly set discrepancy time, which can compromise the safety function's reliability.

• One of the redundant input sensors (e.g., S1 or S2) is stuck, operating intermittently, or has failed entirely.
• Physical damage or breaking of one input wire for a redundant channel, leading to an open circuit.
• Incorrect setting of the 'Discrepancy Time' parameter (e.g., P7-10) which is too short for the application's response time.
• Excessive signal noise or interference on one input channel, causing transient signal discrepancies.

Click steps to track your progress.

1. 1

   1. Measure the electrical state of both redundant input channels (e.g., X1 and X2) at the safety module terminals.

2. 2

   2. Verify the functionality of each individual sensor or switch connected to the redundant inputs.

3. 3

   3. Check the integrity and continuity of wiring from each sensor back to the safety module's input terminals.

4. 4

   4. Review and adjust the 'Discrepancy Time' parameter (e.g., P7-10) in the safety configuration, if necessary.

5. 5

   5. Inspect cable shielding and grounding for the input signals to mitigate potential noise issues.