interfacing masibus transmitter to M340 PLC

Join Date
Sep 2018
Location
Chittorgarh
Posts
22
hello
i want to read temperature data from Masibus UT94 temperature transmitter which is giving data on RS485 port.
i have assigned ID:-30 and baud rate :-9600 to transmiter. now i would like to read temperature from this transmitter through RS485 to ethernet converter(IP 192.168.1.9) using my PLC. my plc is M340 make schneider and software is Unitypro.

can anyone help me with this logic.
modbus address attached for reference

address.JPG
 
Experience shows that Modbus RTU's strict timing requirements are not handled well by generic RS-485/Ethernet converter/gateways. There are a number of commercial Modbus RTU/Ethernet converter/gateways that are designed to handle the timing requirements of Modbus RTU. It will pay to use an RS-485/Ethernet converter specifically designed to handle Modbus RTU. If the converter you does not mention Modbus RTU specifically, then it is generic.

On gateways like the Moxa MB3180, you can choose what the function the serial side is, RTU master or slave, which for an RTU temperature transmitter slave, the gateway serial side would be an RTU master.

Presumably, the PLC has Modbus/TCP client functionality to control the Modbus polling. So the gateway would be a Modbus/TCP server on the Ethernet side.

The two data points you want are Modbus input registers read with the Modbus Function code 04.
 

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