LM90 6.01 vs. CPU331+EEPROM WRITE FAILURE

"(S44) PLC requested action has failed"
Result when WRITE the RAM program to the EEPROM.
No pre-confirmation message first.
VERIFY fails too, seems to not hit EEPROM either.


Changing broken clip modules on 10slot backplane IC693CHS391N
Prepared workbench with spare backplane/PWR321 & NEW CPU331 IC693CPU331-CE FW=8.4 WIN98PC+LM90 6.01+IC690ACC901 cable.

At OEM machine, I can WRITE to EEPROM successfully.
CPU331 FW=8.4 also.

But on workbench, failure.
New EEPROM XICOR X28HC256P-15. JP1=2-3
Confirm, resetting fault table for missing I/O after transfer Not assigning a SNP-ID either.


Some initial thoughts or direction? I could appreciate.
Thinking try another type EEPROM or migrate the old one.
But would like to succeed at the workbench.

I may be wrong, but I think the transfer is between RAM and EEPROM. You will need to send the program and configuration from LM90 to the CPU first, then the write to EEPROM is from CPU RAM to EEPROM.

Correct, the WRITE is from RAM to EEPROM.
So LM90 WRITE function is only starting the process.
Transfer from programmer to PLC RAM is successful.
Program onboard PLC, and after to WRITE is a failure.
Program will RUN, but after power cycle is empty again.
logic parameter changed to RAM, and then is OK.
But I would like to match the existing CPU with an EEPROM.

Are you sure the EEPROM you put in the CPU is compatible? I have only ever written to EEPROMs I purchased from my GE supplier.

Is my concern too.
In the attach photo, the EEPROM is new
It is listed in GFK-0356P manual as a third party compatible
https://www.electronicsurplus.com/
I ordered it from here because it was in stock.
I would feel more confident if was GE as well.
Do you know another IC supplier?
Or better yet a GE supplier or cross reference?

Or better yet a GE supplier or cross reference?

Click to expand...

Powermation or GEXPro

Perfect, and thanks a lot.
Both are vendors with accounts already
Our buyer is running with the GEXPro # 602545
Now I have to pack everything up and go work from home for the next weeks.
Good luck and be safe, Ill update again after I have gotten EEPROMs.