Logic Error: Error in an input or output module

What does flickering mean?

When LED Diag 1 is lit and LED Diag 2 flickers (50 ms ON / 50 ms OFF), it indicates an error specifically within an input or output module. This suggests a malfunction at the physical interface where signals are read or controlled. The specific input or output module affected is not specified by the flickering pattern alone, requiring further investigation.