E-Stop Discrepancy Error - Group 4 (Safe Inputs Active)

What does FB ESTOP Bit 11 mean?

This fault indicates a discrepancy in E-Stop input group 4, similar to 'FB ESTOP Bit 3', but specifically when the 'Safe Inputs after Disc Error' option is activated. This means that even after a discrepancy, the FB attempts to maintain a safe state for the inputs, but a persistent or critical discrepancy has occurred, preventing normal operation and requiring intervention.

• One channel of E-Stop Input Group 4 is failing to maintain its active state when required, leading to a discrepancy.
• Broken wire or high resistance in the connection to one E-Stop input terminal for Group 4 (e.g., controller terminal X10.1).
• Mechanical wear or debris within the E-Stop button causing one contact to be delayed or fail during actuation.
• Insufficient power supply stability to the safety input circuit, leading to inconsistent signal levels on one channel.
• Incorrectly configured discrepancy time (e.g., P_ESTOP_DISC_ACTIVE_G4) in the safety controller for Input Group 4.

Click steps to track your progress.

1. 1

   De-energize and check the continuity of both E-Stop Group 4 input wires from the E-Stop device to the safety controller terminals (e.g., X10.1, X10.2).

2. 2

   Verify the E-Stop button's mechanical integrity and the cleanliness of its contacts for Group 4.

3. 3

   Measure the voltage across both E-Stop Group 4 input channels at the safety controller when the system attempts to enable 'Safe Inputs Active'.

4. 4

   Review the safety controller's diagnostic logs for E-Stop Group 4 to identify specific timing deviations between the channels.

5. 5

   Adjust the discrepancy monitoring time for E-Stop Group 4 in the safety controller's parameters to a suitable value for the application.