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In a (f.e. WireShark) recording between the communication of a PLC and the CODESYS IDE (Integrated Development Environment),
it can be seen, that this communication is limited to a maximum data size per packet of 550 bytes.



The data size is fixed, because the CODESYS routing protocol for communication must not only take UDP communication into account, but must also be able to support CAN, serial and/or USB connections.
In addition, any communication must be considered which refer to devices without a memory, for which 512 bytes + header would be already too large, in order to be able to guarantee error-free communication.

This maximum data size cannot be changed or increased.