The S5-102 processor has 2 modes, an editing mode and a running "Fast" mode. If you have an eprom in the PLC and cycle power, it will go to the "Fast" mode, where you are. It will not let you monitor on line in status mode or make program changes and thus the error message. If you have the eprom, upload the entire program to your programmer from the programming port. Kill power and remove the eprom. Do an over-all reset and then transfer your program back with the modifications. If it fails, fall back to the old program. It will run at about 1/10 of the old speed, but will allow online monitoring. The 102 does not have eprom burning built in and will have to be done offline. Once you get the program the way you want it, erase and re-burn the prom, shut off power, install prom and then you will be back on the road again.