I have recently started a new job and to my surprise the site has quite a few S5 plc's. I had the official training with siemens over 20 years ago and have not seen a S5 for the last 13 years. I am now at work attempting to alter a timer value on a machine but get a message saying user program in eprom. I thought I had done this previously where the program is on eprom, when the CPU has been powered off the program is loaded from eprom but once it is running then online edits can be made and timer values could be edited. I hav unplugged the eprom and the machine is running as normal but still unable to edit the timer value. Am I remembering this operation correctly or am I mistaken? I have resorted to loding the program from the PG to allow me to edit the timer, the eprom can be re-programmed with the correct values at a later time after the commissioning has been completed, but there has got to be a better way. Any advice would be greatly appreciated.