Siemens 115u 943b change eprom to eeprom

[cottagewood]

I did this once before but it was about 30 years ago

I just tried it on a plc this morning and,when i fitted the eeprom and downloaded the program but the plc wouldn't run.
I assume i should have done a plc delete and then downloaded but i bottled it as the machine needed to go back into production.
Am i correct in thinking that no matter what i delete, when i fit tbe original eprom back in the plc will be back to original ?.
Do s5s have a config and if so does it get stored on tbe eprom?

 

[gclshortt]

http://www.plctalk.net/qanda/showthread.php?t=1381

The above thread may help you out.
Regards,

 

[cottagewood]

Thanks Garry,
I did read that thread but it's a bit confusing as someone on it states that an eeprom can't be loaded via a plc which I'm sure isn't true. I know an eprom needs to be programmed outside of the cpu but im pretty sure an eeprom can be loaded via the cpu.

 

[cottagewood]

Another thing that confused me, i first powered down and removed the eprom, then powered back up again, the plc was in run but no program seemed to be in it. I thought that the eprom was just for backup and that the plc should run without it , providing the battery is good. I didn't actually go online at that point to see if there was anything in the plc ram as i was under pressure not to hold up production

 

[sigmadelta]

The EEPROM for a CPU 943 must be programmed by an external USB Prommer or Siemens PG with built-in Prommer, and STEP 5 V7.x (under Windows XP).

 

[sigmadelta]

The S5 95/100U CPUs had the capability of programming EEPROMs on the CPU itself, not the 115/135/155U CPUs.

 

[cottagewood]

thanks for the confirmation