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4.Modbus Address Mapping*
*(Only the Model WS-1122, WS-1222, WS-1322 offer Modbus Read/Write)
The discrete I/O points of the Ethernet Converter can be easily control and monitor
through Modbus/TCP protocol. The Modbus address mapping with discrete I/O is
described below.
4.1 Modbus Holding Register 40001
The 2-point digital output of the Ethernet Converter is mapped with the Modbus
holding register “40001”. The following table describes the exact bit-mapping for
Modbus holding register “40001”.
Modbus Holding Register
Digital Output
40001
DO-1
Bit 0 (40001:0)
DO-2
Bit 1 (40001:1)
4.2 Modbus Holding Register 40002
The 12-point digital input of the Ethernet Converter is mapped with the Modbus
holding register “40002”. The following table describes the exact bit-mapping for
Modbus holding register “40002”.
Modbus Holding Register
Digital Input
40002
DI-1
Bit 0 (40002:0)
DI-2
Bit 1 (40002:1)
10