N2P Controls Posted April 9, 2017 Report Share Posted April 9, 2017 We have a JZ20-R31 that displays the following message on power up: WDT ERR @ 22. The 24VDC power supply for the Jazz died recently and was just replaced. On powering up the PLC the screen was blank for a few minutes and then the WDT ERR message is displayed on the screen. Can any suggest what this indicates and how to remedy? Thanks heaps. Quote Link to comment Share on other sites More sharing options...
AlexUT Posted April 12, 2017 Report Share Posted April 12, 2017 Hi, You should have backup of project for this PLC. Then continue. Power-on PLC with pressed <I> button. This will start PLC with OS stop mode. < PROGRAM STOP > message appears. Does WD error appears? Can you communicate to PLC with MJ20-RS adapter? Create empty project and download it to PLC. Restart PLC and check, if WD error appears or not. If everything is OK - check SB 8 . Is battery low? Download ariginal PLC project. Does it works? If you continue to have WD problem, contact your distributor. Best regards. Quote Link to comment Share on other sites More sharing options...
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