The function block is executing.

Cause:

The PLC Interface function is processing.

Check whether the PLC Interface function execution status is busying.

Wait for the function to finish processing.

None.

Applicable equipment

Source: Fault JSON · fault_codes.json · SHA-256 0e057315d3af8f3e28c54fa6e5a00c0a2e3673122cd98839e32715dea3f7f7d8 · 501

Brand	STEP
Updated	2026-10-27

501

The PLC Interface function is processing.

Check whether the PLC Interface function execution status is busying.

Wait for the function to finish processing.

None.

Applicable equipment

Source: Fault JSON · fault_codes.json · SHA-256 0e057315d3af8f3e28c54fa6e5a00c0a2e3673122cd98839e32715dea3f7f7d8 · 501

Brand	STEP
Updated	2026-10-27