Posted 29 May 2020 Dear All, Need your help. I have problem with plc cj2m cpu35. After power trip plc error. Err HE Ip 01..what is mean? plc also connected with one pc using ethernet cable. Any suggestion need to do... Share this post Link to post Share on other sites
Posted 13 Jun 2020 "CPU Unit service monitoring error" Page 6-26 of Manual W472-E1-13. In Manual W473: "A CPU Unit service monitoring error will occur in the Special I/O Unit if it is not refreshed every 11 seconds. (The ERH indicator and the RUN indicator on the Special I/O Unit will light.)". Share this post Link to post Share on other sites
Posted 14 Jun 2020 The red error lights on the CPU and some of the I/O modules indicate that SIOU refreshing is not being accomplished. Have you made any changes to the PLC settings? Do you have a copy of the program? Do any of the units have check marks [see attached picture]? This error occurs if SIOU refresh has been disabled in the PLC settings and the program logic fails to perform an SIOU refresh for more than 11 seconds. Share this post Link to post Share on other sites
Posted 15 Jun 2020 Whoever designed the panel knows nothing about heat or how to follow directions... wireway is millimeters away from PLC providing no room for cooling. There is a documented minimum airspace required around the controller for proper ventilation. I doubt the issue is heat related, but it can cause cards to fail. Share this post Link to post Share on other sites