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CB 1241 RS485

12/21/2018 10:18 AM	Rate (0)
siamakhakimi Posts: 2 Rating: (0)	How Can I Connecting Between CPU 1214C and HMI By modbus rs485? I have a signal Board ( CB 1241 RS485 ).
siamakhakimi Posts: 2 Rating: (0)
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12/21/2018 12:36 PM	Rate (0)
enof Silver Member Joined: 2/10/2012 Last visit: 3/10/2025 Posts: 315 Rating: (59)	I don't think a siemens hmi will work 'out of the box' with modbus. Not even sure if it has a serial connection let alone a rs485 connection. Use ethernet for that. If you insist using modbus RTU you can use the modbus server instruction in the plc. A hmi can then communicate as modbus client, if capable. But you have to setup a lot (more) yourself than when using the ethernet connection.
	Last edited by: enof at: 12/21/2018 12:37:45 PM
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12/21/2018 2:17 PM	Rate (0)
siamakhakimi Posts: 2 Rating: (0)	Actually, I want learn how can I use CB1241 for connecting between Hmi ( other brands or modbus transmitter .
siamakhakimi Posts: 2 Rating: (0)
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12/21/2018 3:13 PM	Rate (0)
miami Platinum Member Joined: 8/31/2005 Last visit: 3/24/2025 Posts: 2198 Rating: (331)	see https://support.industry.siemens.com/cs/ww/en/view/59057093 The title says it's for S7-1500, but it's for S7-1200 too (at least chapter 5.4)
	Last edited by: miami at: 12/21/2018 3:14:50 PM Last edited by: miami at: 12/21/2018 3:15:06 PM Last edited by: miami at: 12/21/2018 3:15:21 PM
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