Vasilii Posted July 29, 2017 Report Share Posted July 29, 2017 Good day to all! There was a PLC V120-22-T1 with OS version 4.7.1 with a loaded working program that worked fine, but it broke the screen (it turns on, but almost the entire working screen is flooded with a black background), it was decided to buy a new V120-22- T1. Also from the old PLC we saved the working program and loaded it into the new PLC, but the program stopped working correctly. We began to understand what the problem was and found that the new PLC has a newer version of OS 5.04. How to be? Is it possible to make a new version of OS 4.7.1 on the new PLC to download the program and it could work correctly? In advance everyone is grateful for answers Yours faithfully, Vasili Quote Link to comment Share on other sites More sharing options...
Cam Posted July 30, 2017 Report Share Posted July 30, 2017 Yes it is possible to downgrade the OS , you need the OS update and bin files and then can use the OS tab from the communication and OS window to load them into the PLC. Quote Link to comment Share on other sites More sharing options...
MVP 2021 Joe Tauser Posted July 31, 2017 MVP 2021 Report Share Posted July 31, 2017 Contact support at support@unitronics.com to get the files. Then you copy them to C:\Program Files(x86)\Unitronics\Unitronics Visilogic_C\Os\Vision\V120 In Visilogic, go to Connection->Commmunication & OS and select the fourth tab over - Install Operating System. The OS files you just copied should appear there. Joe T. Quote Link to comment Share on other sites More sharing options...
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