text: <s>[INST] Communication between a Siemens ET200SP and a Powerflex 525 I need to let these two component communicate. I was sure there was available a PROFINET module for the powerflex but it seems that exist only for the bigger 7xx series... am I correct? So I see that there is the Profibus module, but from PLC side the profibus add-on it's too big for the current machine. The last solution I think is the Modbus RTU communication but I can't find any real information about that and how to manage it, can you help me? Thank You [/INST] Modbus RTU communication can be accomplished through the embedded DSI port. See App. C inside the User Manual: http://literature.rockwellautomation.com/idc/groups/literature/documents/um/520-um001_-en-e.pdf - fuzzy logic In order to enhance the reputation of the Forum's contributors, please rate the replies you got and remember to close the thread clicking Choose as Best Answer button over the solving answer. Thanks ! \\n </s>