Using the MODBUS library integrated in STEP 7 (TIA Portal) V11 you can define each communication module as a MODBUS master or slave. You can add up to three communication modules to each S7-1200 controller. 22/08/12 Siemens Industry Online Support - Automation Serv ice, Automation Support, Simatic Serv ice, Simatic S… /WW/llisapi.dll?f unc=ll&objid=47755811&nodeid0=34612486&load=tree… show the entry list S7-1200 communication modules - Configuring and programming communication - MODBUS RTU How do you establish MODBUS-RTU communication with STEP 7 (TIA Portal) V11 for the SIMATIC S7-1200? How do you establish MODBUS-RTU communication with STEP 7 (TIA Portal) V11 for the SIMATIC S7- 1200? Display part number Description The SIMATIC S7-1200 enables point-to-point communication using the communication modules CM 1241 RS485 and CM 1241 RS232.
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