Fagus Posted April 29 Report Share Posted April 29 Hello, My plc's RTC date and time are continuously swinging between two values, several times in the same second. RTC switches between today and a date from May 2018 (between 16th and 22th, not always the same day, with a different time). PLC: USC-B5-TR22 CPU OS 1.36.44 UniLogic 1.36.63 I've tried to set date and time from UniApps, from UniLog with "Set RTC", to check "auto-sync", but nothing change. I've also tried to download an empty new project to plc, just with some watches on RTC Date: same issue. It's a problem as I want to use a schedule but it switches continuously between true and false... Does someone know what to check else? Or what to do? Thanks in advance. 2024-04-29_14h31_48.mp4 Link to comment Share on other sites More sharing options...
ORSO2001 Posted April 29 Report Share Posted April 29 hi @Fagus do you already check the RTC battery? Link to comment Share on other sites More sharing options...
Fagus Posted April 30 Author Report Share Posted April 30 Hi, The battery is good. Replacing it by a new one doesn't change anything. Link to comment Share on other sites More sharing options...
AlexUT Posted April 30 Report Share Posted April 30 1. Please load completely empty project - no Ladder and no Display elements. *Use "Download All" option. Does this solve problem? 2. Update firmware (use "Forcr" option). Repeat PP 1. Link to comment Share on other sites More sharing options...
Fagus Posted April 30 Author Report Share Posted April 30 "Download All" empty project -> download successfull, but no changes about RTC Note: RTC Date is unstable but UTC Date is stable and correct. Forced remote update firmware, then "Download All" again same empty project -> the download was successfull, I think, but then I lost the connection to PLC "Please check IP configuration". If I try "PC - PLC Communication", I get "Ping to device wasn't successfull" I tried to restore IP configuration with an USB action file, but the actions permissions has been removed from PLC (while they are still activated in the empty project) 30.04.24 11:51:21 Command Write Panel IP was not defined in UniLogic 30.04.24 11:51:21 Command Write CPU IP was not defined in UniLogic I can't access my PLC anymore... Link to comment Share on other sites More sharing options...
AlexUT Posted April 30 Report Share Posted April 30 How far is PLC from your office? Link to comment Share on other sites More sharing options...
Fagus Posted April 30 Author Report Share Posted April 30 Very near. I haven't USB cable with the right USB connector type here. I can find one for thursday. But if there's anything else that can be done on the plc, I can do it. Link to comment Share on other sites More sharing options...
AlexUT Posted April 30 Report Share Posted April 30 First - attempt to use USB cable and ping than connect VNC to IP 169.254.0.1 You can check if this network exists after connecting USB cable to powered-on PLC: C:\Windows\System32>ipconfig Windows IP Configuration Ethernet adapter Ethernet 8: Connection-specific DNS Suffix . : Autoconfiguration IPv4 Address. . : 169.254.161.234 Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : Link to comment Share on other sites More sharing options...
Fagus Posted April 30 Author Report Share Posted April 30 Thanks for your help. I will try with USB cable on thursday. Note: The RUN led was orange blinking on PLC (Stop mode according to help). I've tried to shut off / restart it: RUN led became orange on, then after some time, orange blinking. Link to comment Share on other sites More sharing options...
Fagus Posted May 2 Author Report Share Posted May 2 Hi, I've connected the PLC with USB cable and got access to it. This message box has appeared and I've followed its instructions: . Now I have empty project on PLC and the RTC date is still unstable. Link to comment Share on other sites More sharing options...
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