Posted 12 Nov 2021 We have a Omron HMI NT631C-ST153B-EV3 connected with Omron PLC CQM1H-CPU51 The backup battery of 3.6V got discharged and before replacing the program data got erased After replacing the battery the HMI is getting upto system initialization screen with a error message Program doesn't exist or incorrect We don't have program back-up Request to help to resolve the issue Share this post Link to post Share on other sites
Posted 12 Nov 2021 If I'm not mistaken, the program is stored in flash memory. You lost only the communications settings. Do you have CX Programmer? If you can get the serial port settings from the PLC you'll need to make the screen match them in the screen. Touch any 2 corners of the screen to get to the system menu. Most likely the settings are NT Link (1:1 or 1:N) since it lost communications. Default is Host Link 9600, 7, E, 2 for both PLC and NT. Share this post Link to post Share on other sites
