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PLC programming tools used is concept 2.6 using Momentum PLC use for VSD ATV61. Peer cop address for input is 401550 length 4 BIN, Output 401500 length 10 BIN. Go to option link 0 is ticked. My Modbus port 1 (RS232) 8-E-1 address 1. Modbus port 2 (rs485) 8-e-1 address 1 both are set 9600.XMIT block address 401600.