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Modbus Communication

9/26/2013 9:41 AM	Rate (0)
qayyum faiz Experienced Member Joined: 7/30/2012 Last visit: 1/16/2025 Posts: 127 Rating: (0)	To have modbus communication with S7-1200 Do we need have to purchase a seperate license key just like S7-400 we have to have a CP and a seperate license key to add modbus library... do we have to do same with S7-1200 if yes then can please any one tell me what are the hardware requirements for communication of S7-1200 over Modbus means do i have to Add CP and purchase the licese as well if yes then i need part numbers if any one can help me with this Thank you!!

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9/26/2013 9:44 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 12/24/2025 Posts: 9097 Rating: (1202)	Hello, If you are talking about Modbus RTU, you only need a CM1241 or CB1241 (includes the Modbus RTU protocol) You only have to check whether you need RS232 or RS485 Best regards, Wizard

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9/26/2013 9:46 AM	Rate (0)
qayyum faiz Experienced Member Joined: 7/30/2012 Last visit: 1/16/2025 Posts: 127 Rating: (0)	how to Access the modbus blocks in TIA portal??

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9/26/2013 9:58 AM	Rate (0)
qayyum faiz Experienced Member Joined: 7/30/2012 Last visit: 1/16/2025 Posts: 127 Rating: (0)	what i want is i want to monitor the status of my I/O on a DCS system.... hope u get it what i meant......

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9/26/2013 11:01 AM	Rate (1)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 12/24/2025 Posts: 9097 Rating: (1202)	Hello, Perhaps this link might help: how do you establish a MODBUS-RTU communication with STEP 7 (TIA Portal) for the SIMATIC S7-1200? Best regards, Wizard

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