Readback Contact Open or Welded N/O Contact

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An error in the reset circuit has occurred: either the readback contact of an external actuator is open (external error), or an internal normally open (N/O) contact is welded shut (internal error). This state is present when sensor circuits 1 and 2 are active, the reset/start circuit is activated, and the segment circuit is open. This prevents the reset circuit from operating correctly, thereby compromising machine safety.

• Readback contact of the external actuator in the reset circuit is open
• Internal normally open (N/O) contact is welded shut

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1. 1

   For external errors: Check the external actuator for proper operation and verify the state of its readback contact

2. 2

   For internal errors: Perform a power down reset (switch off and then re-apply operating voltage)

3. 3

   After addressing the error and performing any power down reset, conduct a subsequent function test