The bit 0 of q_wAlrmId is TRUE.

Wrong order of the limit switch detected.

Check for the wiring of the limit switches. The function block is designed for the NC type of input signals from the limit switches only.

The bits 1...3 of q_wAlrmId are TRUE.

The parameterization of the function block is incorrect if the stop on distance function is enabled.

Check the parameterization of the function block.

Raised alarm in first cycle for Limit switch error bit 0.

Information about limit switch status is transferred through the fieldbus.

Wait until the state of the limit switch is updated after power cycle of the controller before enabling the FB.