Modbus TCP SLAVE (TCP to TRU)

CODESYS
1

I’m faced with an unusual task.
The Wago PFC200 is connected via Ethernet to the MOXA.
The MOXA is configured to operate the TCP Server on standard port 4001. It will send Modbus Master RTU via RS-485.
It is necessary to make software conversion Modbus Slave TCP to Modbus Slave RTU somehow. Is that possible?
P.S… I have previously done a similar conversion for FbMbMasterTcp (WagoAppPlcModbus). There it is done quietly via eMbFrameType.0.

2

Hi Tomas,

What is the role of the PFC200 in your setup? Do you need it to act as a Modbus TCP Slave and a Modbus RTU Master?

BR,

3

The PFC200 will be in the Slave role

4

Yes, you use the 750-8212 serial port as a ModbuRTU slave. You can right click on the left side and add Modbus Slave to the tree, then you can configure the register arrays.

Please keep in mind that these variables are not retentive, so you will need manage this in your program. (write every few seconds to retained variables, and then read/load the values on power up, etc)

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5

Thanks for the reply, I know that way.
I need to forward Modbus TCP to RTU.
In the program tree will be Ethernet - Modbus TCP Slave.