The PLC is a S5 100u CPU 102 with 2 I/O units. The old unit was on Stop mode because it had a PEU error in ISTACK. We replaced the CPU and everything is fine, the green light is on, but no program is loaded.
I made the steps to load the program from the EPROM (it's the memory with the UV window), but no valid program is loaded. The only things that are loaded are the arithmetic FBs (FB240 to FB251). Is it a special procedure to load the program from the EEPROM for CPU102 ? I don't have access to a Siemens programmer and i use PG2000 to connect to the PLC with a DIY RS232-TTY interface.
The schematic was on the manual that came with the machine.
When the new CPU came (SH unit bought from Ebay), i connected the memory module and i started the PLC. Next, i found a program in the PLC, but it doesn't look like the schematic from the manual. I saved the program and performed an overall reset and then a manual loading of the program from the memory module to the program memory, as it states in the manual. And now, only the arithmetic FB's are in the program memory. Is it possible that the program i found in the PLC to be from the old machine, even thought i connected the memory module before starting the PLC ? The program should have loaded from the memory module at PLC start ?
Thank you.
