Thanks for your help.
I have come across the hand held programmer in my draw!, looks like a pain in the arse type thing.
By the way, is it possible for me to remove a flash card from a S7 - 400 CPU, without interupting the PLC, or did the machine grind to halt purely by coincidence, the second the card left the pin connections?.
As i understand, and from past experience, the PLC does / should not use the Flash cards / Eproms under normal cyclic conditions.
As you are probably aware by now, my PLC knowledge is at the " knows enough to be dangerous" stage!.