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May I know which value you want to read from P3 relay?
Because as I know, in P3 relay, all the values are kept within 16 bits.
And normally the scaling setting will be sufficient to keep the value within 65535.
So my understanding is that we may not need to configure it in PO, normally no special action is required, because most default scaling setting in P3 is sufficient.
I have attached a Modbus configuration application note for P3 for your reference.
Hope this can help.
Best regards,
Frank
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