As I understand you want the core to be an EtherNet/IP™ Device under an external PLC and an ProfiNet Scanner for talking to drives under the core? In that case its enough with a X3 (not modular) and the CodeSys communication packages: https://developer.community.boschrexroth.com/t5/Store-and-How-to/CODESYS-Fieldbus-Communication/ba-p/49248
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