Set the command data in 'Message communication command' (Un\G272 to Un\G287) (110H to 11FH).
Set the attribute data in 'Message communication data' (Un\G304 to Un\G423) (130H to 1A7H).
When 'Message communication request' (Y12) is turned on, the master node writes the attribute data to the slave node set with the command data.
When the write processing completes, the processing result is stored in 'Message communication result' (Un\G288 to Un\G303) (120H to 12FH) and
'Message communication completion' (X02) turns on.
When the write processing completes with an error, 'Message communication error signal' (X05) turns on. The content of 'Message communication result'
(Un\G288 to Un\G303) (120H to 12FH) is read, and the cause of the error is checked.