program lost after operation in PLC 5/20

  • Thread starter sandeep kharbanda
  • Start date
S

Thread Starter

sandeep kharbanda

I have the PLC 5/20 for the operation of DG in automatic mode. when the grid fails the DG operate in automatic mode. from just few days i have been facing the problem that just after the operation, the program of the plc lost.

can any one guide me why this is happening?
 
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