[Al_The_Man]

I doubt if there are many of these around any more, and if there is, not many will have the PLC listing or the ability to extract it.
You may have to start from scratch with a PLC of your choice and come up with a suitable program.
Many machines of this era had the basic commands in and from the CNC side and the MTB would supply whatever PLC they chose, before PLC/PMC became built in.
The only thing you would need is these basic I/O lines in and out of the CNC.
A simple example is you would have one line in that is cycle start, the PLC program would condition this signal before inputting into the CNC, such as looking at overtravels and control on etc,etc.
The trickiest will be the M,S & T code conditioning.
Al.