Hi All!!!

I currently have some phenomena on INTEGREX 200-SY with MAZATROL 640.
I would appreciate any advice concerning this phenomena.

I see at ladder diagram of the machine that output Y8F must be activated (the rang is closed to activate it). However, the output is actually deactivated, "0". And there is only one rang in ladder activating the output. See screenshot attached.
I see that it is "0" in voltage measurement as well as in DIAGNOSIS MONITOR screen.
I can activate the output manually in I/O MONITORE WRITE option of DIAGNOSIS MONITOR screen. I see also the output voltage when I activate it this way.
However the output does not work according to PLC ladder.

I also tried to change the value of Y8F through DIAGNOSIS screen at other machine with MAZATROL 640, but there, the value cannot be overridden this way, i.e. there is some protection.

Looks like some I/O override parameter/command activated.
Could you please advise any possible solution for this issue? May be I should simply correct a parameter that I'm not familiar with?

Note: The IO module interfaces with the machine through some serial protocol. I could not identify this protocol since it's not indicated in MAZAK documentation also.

Thanks in advance!