I have a controller 750-8208 with programming software codesys v2.3.9.66. I want to read modbus tcp data through FB. When I load the library i.e. ModbusEthernet_04.lib, the program shows error. Is there a way to upgrade this library in codesys 2.3 or is there any other library through which i can re…

I believe you need to add the Ethernet.lib library to your project. On my system, that library is found in the “32-Bit” folder inside my 2.3 library repository. [image]

@AdamReeve @pp0098 please be aware that libraries in the 32-bit folder may not work for the PFC200. Instead of the ModbusEthernet_04.lib i would recommend the WagoLibModbus_IP_01.lib

Thanks for the clarification. Does anyone know up to which version of the PFC200 firmware the 32-bit Ethernet.lib is supported and therefore functional? The WagoLibModbus_IP_01.lib does not seem to allow the implementation of a Modbus server/slave, but only a client/master.

The Ethernet lib is not compatible with the PFC200 at all. The naming of Master/Slave is only for Modbus serial where only one Master is possible. On the Ethernet side you should use Client/Server. because more than one Client can communicate with the same Server (last command win). On this side,…

Hi, found your reply on similar topic, could you please answer this post: [image] Modbus tcp server on different ports, 750-899 CODESYS Hello everyone, Which library do I need for my 750-899/… PLC if I want to listen different ports for Modbus TCP requests. …

Codesys 2.3 Library

CODESYS

Yevhen_ea August 25, 2026, 3:26pm 7

Hi, found your reply on similar topic, could you please answer this post:

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Codesys 2.3 Library

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