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Not very favourable design to trust HMI / OPC to perform such actions.
If the destination is a PLC, it is *VERY* advisable to implement the set/delay/reset there.
In my case, it's from HMI to IED (IEC61850 MMS Protocol) through IEC Connect. Is there any other best possible/reliable solution?
Sorry, nothing comes to mind other than you should avoid design where the HMI acts as a PLC (performing automated actions).
Please speak with an IEC specialist about what can be done without involving the HMI in a set-reset operation.
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