Modbus RTU and 750-653

CODESYS
1

How to use 750-653/003-000 module for modbus RTU (RS 485) communication in codesys 3.5?

2

CODESYS does not support using the Modbus configuration for a 750 module the same way it does for on-board ethernet and serial ports. You will need to use the WagoAppPlcModbus library. This contains a FbMbMasterSerial function block that you can use. Just use the name of the 750-653 module as the I_Port input of the function block.

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Then add your desired Baudrate, Data Bits, etc to those inputs as well. You will have to manually manage the utQuery structure and xTrigger input to do the required operation on the Modbus servers you have attached.

3 Likes
3

Hi!!
How configure the I_Port If the module is in a coupler (For example a Modbus TCP Coupler)?

4

The example below shows how to create an I_PORT for a 750-1632 in a remote Modbus/TCP node. PV_inputs[0…11] and PV_outputs[0…11] are Modbus data.

Also, you need to add the library WagoSysFieldbusModule to your project.

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5

Thanks you I will try it!