PLC5 - Which program loads?

We have a PLC5/20 with a EEPROM. The program loaded in the EEPROM is the same as the running program in memory. The configuration is set to have the EEPROM load the program on startup.
If I go to program mode and load a new (and different) program to the processor and then go back to run mode did the EEPROM load it's program when I switched between program and run? Does the EEPROM load only when powered off and then powered back on?
I looked through the archives and did not find an answer to this question.
Thanks for any help.

It should only load on power up. I don't have the document at hand but I remember it being in one of my manuals that explains the backplane switches for the 1771 I/O.

Yes a power cycle is required for the EEPROM to reload. See page 3 of this document on the EEPROM. It's a bit dated but still applies.

http://literature.rockwellautomation.com/idc/groups/literature/documents/td/1785-td007_-en-p.pdf


Also, here is the Processor User Manual. Check out page E-4.

http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1785-um012_-en-p.pdf

OG

Thank You both

Thanks msmassey and operaghost.