EEPROM Loss?

[mbrun93 0]

We have an SLC04 in one of our pieces of equipment that loses its memory everytime we experience a power disruption. We have installed new batteries twice(Just to be sure the first replacements were not defective). We don't normally lose power, however we are doing a number of upgrades to equipment and frequently shut main power to the building down to install breakers,etc. on the weekend. Every time we do this we lose the program on this particular machine only. I believe that there may be a problem with the EEPROM. Does anyone have ,or have you had in the past, a similar problem and ,if so, was the EEPROM the culprit? As to the cause, I am thinking that the cabinet may be too hot. It is pretty full and the cooling system is not that great

[Shiner 2]

how hot is hot? Do you have an IR temp reader? What kind of time period are you powering down for? AB has a list of what may corrupt the memory on these series processors. http://au.rockwellautomation.com/applications/gs/ap/gsau.nsf/pages/SLC500_Installation_CheckList

[mbrun93 0]

[mbrun93 0]

temp is probably 100f to 110f haven't taken a reading yet ,but know this is too hot. Thanks for the link.

[Shiner 2]

110 is fairly hot to the touch, not comfortable running equipment that hot, but if you do the conversion it is about 43C and the AB spec says it is good up to 60C....

[Ken Roach 194]

Your description is consistent with the EEPROM being loaded with an "empty" application program and being set to "load always". You can test this by going online with the controller and performing a "Load from EEPROM". If the result is an "empty program" then you've found the issue.