Reference
Making special settings in the "Properties > General > Settings" parameter group
Depending on the CP type, you will find setting "Data transfer > 240 bytes"
Notes on data transfer > 240 bytes
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Data transfer > 240 bytes is supported by the newer versions of the CPs. Refer to the information in the documentation of your Ethernet CP.
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With the S7-300 series, remember that this configuration uses one connection resource (free connection for S7 functions) on the S7-300 CPU. CPU connection resources are also used, for example, by S7-300 CPs in FMS mode or by programming devices or OPs.