What is the specific communication protocol used between the M74-PLC and the CCD machine code of the KM-ASSYM2-05?

Can you verify if the CCD part machine code is running correctly and receiving commands from the M74-PLC?

Is
The solution to this issue could potentially be to restart the CCD part, which could communicate with the M74-PLC and provide feedback. However, it's important to take note that this is just one possible solution and other underlying issues