In the official online documentation for the Modbus TCP V1 app (https://docs.automation.boschrexroth.com/doc/4288575786/supported-function-codes/3-03/en/) is FC2 not mentioned. So I guess it is simply not available.
See in comparison the documentation of version 2 https://docs.automation.boschrexroth.com/doc/1973345983/supported-function-codes/latest/en/
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