E-Stop EDM Monitoring Error - EDM1

What does FB ESTOP Bit 4 mean?

An External Device Monitoring (EDM) error has been detected for the EDM1 feedback loop of the FB ESTOP. This typically means that the feedback from the safety contactors or relays, which are expected to open after an E-Stop activation, has not been received within the allowed time or in the correct state. This indicates a failure in the safety output circuit or feedback path, preventing safe operation.

• Auxiliary feedback contact (e.g., NO contact 13-14) of the external safety contactor K1 is failing to close or open as expected.
• Wire break or loose connection in the EDM feedback loop from safety contactor K1 to the safety controller's EDM1 input (e.g., terminal X5.1).
• Main power contacts of the external safety contactor K1 are welded, preventing the auxiliary contact from changing state when de-energized.
• EDM monitoring time parameter (e.g., P_EDM_MON_TIME_1) in the safety controller is set too short for the contactor's mechanical response time.
• Incorrect wiring of the EDM feedback loop, such as using an NC contact instead of an NO, or vice versa.

Click steps to track your progress.

1. 1

   De-energize the circuit and verify external safety contactor K1 is de-energized. Use a multimeter to measure continuity across its EDM feedback auxiliary contact (e.g., K1-A1, K1-A2), which should be open.

2. 2

   Energize the safety circuit (without active E-Stop) and verify K1 pulls in. Measure continuity across its EDM feedback auxiliary contact, which should now be closed (e.g., 0 ohms).

3. 3

   Inspect the auxiliary contact block of contactor K1 for physical damage, proper seating, and correct contact type (NO/NC).

4. 4

   Trace and measure resistance of the EDM feedback wires from contactor K1 auxiliary contacts back to the safety controller's EDM1 input terminals.

5. 5

   Verify the EDM feedback loop configuration parameter (e.g., P_EDM_INPUT_TYPE1) in the safety controller matches the physical wiring (e.g., normally open feedback).