PLC has stopped communicating with NCU on the operating screen

AutoGen_3718683

Good Morning.  our plc has stopped communicating with ncu on the operating screen. NC / plc communication failure appears, on the electrical panel our plc has no number and a dot to the right.  How do I reestablish this communication? 

 Hello,

Please create new topic instead of posting in old topic.

You have not mentioned your controller type, but I presume it to be 840D. 

From your attached snap, it looks like NCU has detected error in cyclic operation. Please switch OFF & ON power of NCU & check if same status of NCU repeats. If so, check if you have valid NC/PLC start up data on your machine or on external storage devices. After confirmation of valid NC/PLC data, please clear NC/PLC data (refer attached sheet for details) & check NCU should display number 6. If it is so, then you can reload NC/PLC data. If there is no any change in NCU seven segment display, please remove PCMCIA card from its slot & reinsert it & check.

If problem persist, probably you need to check 840D NCU box.

HTH.

Hello,

Error is NC reset not possible because NC is not ready.

Please note, unless you get 6 on seven segment display of NCU (i.e. NCU boot succesfully & PLC is in run mode), data could not be reloaded. So please refer my reply in earlier post, try to clear NC, PLC data, check/see that system boots on default data & gets READY i.e. 6 on seven segment display, no error, PLC in RUN mode, DP yellow/orage LED blinks. Then try to reload back up.

HTH.