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I am periodically having a problem with Read_Var function Blocks on switch-over in M580 hot standby systems. What can be a possible reason?

In a Hot Standby system, it is important that the variables in the communications blocks are not transferred from the primary to the standby so that on a switchover the blocks will not be is a strange state. Therefor all variables associated with the blocks must have as an attribute that they are not exchanged. So the check box for EXCH On Standby MUST be unchecked. See the screenshot in the attachment. 
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