Posted 22 Nov 2015 (edited) I just commissioned a system utilizing 3 1756-IRT8I TC Analog Input Modules. It was soon discovered that there were sags in the order to 2 -10 % in the inputs across all channels. These sags occurred in all three modules but at different times but were occurring more or less on ~4-6 hour intervals. There are two CJC inputs (Cold Junction Compensation) and it was discovered that one CJC value also sagged while the other one remained constant through the sags. Tech Support had no information about the issue, but eventually found that there was a thus far unannounced firmware update, that was made available. The problem modules all had FW Version 1.013 and the Update Version as of Mid Oct, 2015 is Version 1.014. Following the FW update, the sags are no longer being seen. Bob A. Edited 22 Nov 2015 by Bob A. Share this post Link to post Share on other sites
