Interesting background Pee, thank you.

I tried not loading the ASM file, but the controller wouldn't jog the lathe although it went 'ready'. So I tried a full reload with ASM and very sadly it STILL won't jog - PLC reporting a few errors such as low hydraulic pressure (Gauges say OK), and drive faults. Had enough for today - will re-visit it tomorrow with hopefully a clearer head. It's probably nothing to do with ASM not having been loaded, and more to do with old electronics being turned on and off a few times.

Thankfully I have in the past (thanks to help from Pee El Sea) managed to get Step 5 running and download and interpreted the PLC program which helps enormously fault finding. I'll try and set up Step 5 in monitoring mode which shows the state of variable if I can remember how to do it !

Copy of my PLC program attached as bedtime reading :)

Not Jogging was the Keyswitch on the control panel - so back to just not taking any notice of the PCA file.