When you say "PLC", Are you referring to the PLC app, with CODESYS support? I presume the MODBUS-TCP app is intended to provide support from the Ubuntu Core OS, without requiring the PLC app and CODESYS.
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I have found this datasheet S20-ETH-BK, but it says the module supports MODBUS, not Ethercat. Is in this case you suggest using the PLC app in the ctrlX core along with a CODESYS softstack that support MODBUS?
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