Gateway Modbus Tcp-Ip / Modbus Rtu (1 Port Master And 1 Port Slave); How It Works - Seneca Z-KEY User Manual

Modbus ethernet serial gateway and serial device server

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USER MANUAL – Z-KEY

11.

Gateway Modbus TCP-IP / Modbus RTU (1 port Master and 1 port

Slave)

In this scenario a Modbus TCP-IP master is connected with ethernet to Z-KEY, one PLC with only the

Modbus Master protocol is connected to the Z-KEY Modbus slave port. By this port the Modbus RTU Slaves

(connected to the Z-KEY Modbus Master port) values are available for the PLC.

Also the PLC can write to the Modbus Slaves registers.

Through the ethernet the Registers written from the Z-KEY Modbus Slave Port or read from the the Modbus

Slave Port are available.

A typical LAN connection is represented into this figure:

11.1.

A lot of PLCs have the limitation that only the Modbus Master protocol is implemented. When values from

the Modbus Slaves must be read/write from the PLC and also from a SCADA/Datalogger, the Z-KEY can be

configured with one serial port in modbus slave (connected to the PLC modbus master port) and the other

in modbus master (connected to the modbus slaves).

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