Posted 17 Nov 2016 Need a little help here - I am trying to re-purpose some old hardware. I have 2 old SLC5/04 B processors (+15 yrs?), that are giving me the same problem. After a power cycle, they boot to a solid fault light - no comms. Cycling the keyswitch has no effect. Popping the processor from the rack and reseating it, powers up in a default state - it will not reload automatically from the EEPROM (when I establish comms, I can reload from the EEPROM or download the program from RSLogix). I can't read the processor fault. The battery is good. The rack was scavenged, I have no idea its history. Also in the 4-slot rack are DI, DO and RIO Scanner cards. I would consider my self a competent programmer, but no A-B expert. Any ideas here would be appreciated. Share this post Link to post Share on other sites
Posted 17 Nov 2016 Probably one of two things. Could be a faulty EEprom module, but since it loads up when you take it out I doubt that. Check incoming power to the power supply, and if OK then replace power supply and see if problem goes away. Obviously if it goes away then the PS is to blame. Share this post Link to post Share on other sites
Posted 17 Nov 2016 I have seen this problem before in my case it turned out to be a bad chassis. Chassis and power supplies are cheap on eBay. I would swap them both out. See link below. http://forums.mrplc.com/index.php?/topic/13336-slc-clears-program-on-power-updown/ 2 people like this Share this post Link to post Share on other sites
Posted 17 Nov 2016 Unfortunately, I don't have a spare 4-slot, but I do have a 7 I can use to test. Thanks, for finding that old thread - I looked at a bunch, didn't find that one. I'll post what I find. Share this post Link to post Share on other sites
Posted 18 Nov 2016 Is the 120/230VAC jumper on the rack power supply set for the correct voltage? Share this post Link to post Share on other sites
Posted 21 Nov 2016 Haven't abandoned the thread, just haven't had a chance to get back to the site. Should be there tomorrow. BTW - double checked the jumper, its good. Share this post Link to post Share on other sites
Posted 23 Nov 2016 Quote Finally had a chance to swap the 4-slot carrier - and everything is working great! Thanks for all the help. Share this post Link to post Share on other sites
Posted 23 Nov 2016 Thanks for letting us know what you found. Share this post Link to post Share on other sites