Posted 19 Aug 2019 (edited) I have found my self in a plant with no experience with this PLC its old and I cant find much documentation. Just out of curiosity say I had a failed input output card (series 800). Can I remove power to the processor or remote processor(J890) and have it retain its memory ? also are they any changes I would have to make in Concept programming software to see this new input/Output card. I am aware of top and bottom keying on input/output modules. Just want to be prepared so if any thing happens which I am sure it wont I will atleast know a thing or two. Thanks for any info Edited 19 Aug 2019 by mmd604 Share this post Link to post Share on other sites
Posted 19 Aug 2019 You do not need to kill power to replace an I/O card. You can replace it "hot". You only need to kill power on the processor, remote I/O interfaces, power supplies etc. The J890 gets updated from the processor on power up. nothing to reload there. Also, no programming changes for replacement card. 1 person likes this Share this post Link to post Share on other sites
Posted 19 Aug 2019 Ok thanks so for example If I change a bad I/O card on remote rack and processor(J890). I can kill power to the power supply I wont risk losing memory because the memory is stored on the Master PLC ? That being said if I was to change a bad I/O card on the Master PLC (984) just make sure my battery is good before I kill power on the power supply. Once again thanks for any info you provide! Share this post Link to post Share on other sites
Posted 19 Aug 2019 That is correct. But even on the "master" rack you do NOT need to kill power to replace an I/O card. 1 person likes this Share this post Link to post Share on other sites
Posted 19 Aug 2019 Ok thanks sorry for being a pain but in the manuals it says to kill power to the power supply before pushing in i/o card that's not correct? or just a safety precaution Share this post Link to post Share on other sites
Posted 20 Aug 2019 (edited) Geez, a 984A, B or X? I worked on those in the early 90s. I remember them being "hot swappable" as long as it was a one for one replacement. I think there were exceptions for some specialty modules. I think I used Concept once. This is the dark ages, we used the old Taylor MODSOFT running in a MS-DOS or WIN 3.0. Of course, before that we have the oscilloscope suitcase for programming on a 4 inch CRT. Edited 20 Aug 2019 by pcmccartney1 1 person likes this Share this post Link to post Share on other sites
Posted 20 Aug 2019 (edited) Its A I believe and to be honest it scares me haha. That being said these things last!! 20 years no problems Edited 20 Aug 2019 by mmd604 Share this post Link to post Share on other sites