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U10-11-UA24 display problems

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I’ve encountered problem with JZ10-11-UA24, programmed using latest U90 Ladder 6.4.9 and using O/S JZ V1.12 (B00). PLC controls temperature in oil heater – so I know that it keeps running outputs properly, but after random amount of time lets say 1h or so display and keyboard hang. There is no possibility to change screen - display shows mix of proper data with some random chars in random places seems like multiple variables are being overwritten? I was trying to recompile project, making slight changes, deleting variables etc. even exchanging PLCs - nothing  helps.






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