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get data for RS422(Slave) and RS485 (Master)

Created by: Tanink at: 7/12/2013 1:30 PM (8 Replies)

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7/12/2013 1:30 PM	Rate (0)
Tanink Posts: 7 Rating: (0)	Hello Could you example for me of S7-1200 about modbus. I want to get data for RS422(Slave) andRS485 (Master) detail asattach fils Thank you TaninK Attachment S7-1200.jpg (518 Downloads)
Tanink Posts: 7 Rating: (0)	Last edited by: O_Moderator at: 7/12/2013 2:01 PM new subject after splitting from /tf/WW/en/Posts/81907#top
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7/12/2013 1:37 PM	Rate (0)
umencho Diamond Expert Joined: 3/21/2006 Last visit: 3/30/2025 Posts: 10239 Rating: (1183)	Start withHow do you establish a MODBUS-RTU communication with STEP 7 (TIA Portal) for the SIMATIC S7-1200?

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7/15/2013 12:15 PM	Rate (0)
Tanink Posts: 7 Rating: (0)	Hello UMENHO Thank you for your link to me.I would like to inform you. I have first time for experiencesiemens modbus. So Could you please suggest me about slave and master in only oneCPU and slave card is RS422. andmaster two card is RS485 as below link using network 2 CPU for transfer data master/slave. Do you have guide line or example for 1 CPU and slave card is RS422.andmaster two card is RS485? How do you establish a MODBUS-RTU communication with STEP 7 (TIA Portal) for the SIMATIC S7-1200? Best Regards TaninK.
Tanink Posts: 7 Rating: (0)
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7/15/2013 12:31 PM	Rate (1)
Kaulquappe Posts: 3093 Rating: (324)	Hello Tanink, for your configuration you need three calls of MB_COMM_LOADwith different instance DBs and different port numbers. So you need the sample "S7 is slave" twice and the sample "S7 is master" once. You should combine this three parts in you program. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)	Last edited by: Kaulquappe at: 7/15/2013 12:35 PM
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This contribution was helpful to 1 thankful Users Tanink

7/15/2013 12:36 PM	Rate (0)
DS SURESH KUMAR Bronze Member Joined: 4/17/2012 Last visit: 4/5/2025 Posts: 474 Rating: (10)	Kaulquappe Hello Tanink, for your configuration you need three calls of MB_COMM_LOADwith differern instance DBs and different port numbers. So you need the sample "S7 is slave" twice and the sample "S7 is master" once. You should combine this three parts in you program. Regards, Kaulquappe Hi, is this configuration will work in modbus with different netwiork layer? Slave is RS 422 and Master is RS485?
	Last edited by: DS SURESH KUMAR at: 7/15/2013 12:38 PM
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This contribution was helpful to 1 thankful Users Tanink

7/15/2013 12:49 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	DS SURESH KUMAR is this configuration will work in modbus with different netwiork layer? Slave is RS 422 and Master is RS485? Yes, each module represents one Modbus device.The firstmodule represents the Modbus master, the second module represens the slave to master A and the third one the slave to master B. And each module can use different physical interfaces. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)	Last edited by: Kaulquappe at: 7/15/2013 12:54 PM just have a look at the attached jpeg of Tanink - this are three different connections
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7/15/2013 12:53 PM	Rate (0)
Tanink Posts: 7 Rating: (0)	Dear All Yes Sir. Slave is RS422 and Master is RS485. and also I need to you suggest or give me for example "S7 is slave" twice and the sample "S7 is master" once.as you are expert suggest. for network show as abrove attach fils. Thank you so much for you support. TaninK
Tanink Posts: 7 Rating: (0)
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7/16/2013 1:49 PM	Rate (0)
DS SURESH KUMAR Bronze Member Joined: 4/17/2012 Last visit: 4/5/2025 Posts: 474 Rating: (10)	Tanink Dear All Yes Sir. Slave is RS422 and Master is RS485. and also I need to you suggest or give me for example "S7 is slave" twice and the sample "S7 is master" once.as you are expert suggest. for network show as abrove attach fils. Thank you so much for you support. TaninK Hi, Sorry just one i saw your attachment of the configuration. it is possible only. In your S7-1200 you should have both communication modules one for RS 422 and other for RS 485. In 1200 you will get a Communication Board (CB) and connect other comunication left side of CPU.

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This contribution was helpful to 1 thankful Users Tanink

7/31/2013 8:38 AM	Rate (0)
O_Moderator Diamond Member Joined: 4/24/2009 Last visit: 8/20/2024 Posts: 2682 Rating: (135)	Follow-up question was splitted to question about modbus 1 slave (Sensor) 2master (one is DCS and one is flowcom) Best regards O_Moderator
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