Limitation
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.
Example: 
Background:
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.