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Restoring RET function block accumulated time after power failure

We use the RET function block to control change sequence for drier unit. All is working perfectly except the fact that after a power failure or controller download the RET count is reset to zero thereby forcing the sequence to start from beginning.
We have enabled the "Restore parameter values after restart" but the problem persist.
Kindly assist with suggestions on how to solve this problem.

Thank you 



Moses Sawa

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