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S7-1200 & Modbus TCP

Created by: Abyrne at: 7/1/2009 4:50 PM (55 Replies)

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7/1/2009 4:50 PM	Rate (0)
Abyrne Bronze Member Joined: 11/26/2008 Last visit: 10/20/2025 Posts: 101 Rating: (4)	I was wondering if Modbus over Ethernet (TCP) was supported by the S7 1200...
	Last edited by: CS Moderator at: 7/8/2009 1:33 PM new subject Last edited by: Abyrne at: 7/1/2009 4:51 PM
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7/2/2009 9:08 AM	Rate (0)
Mr D Posts: 21 Rating: (4)	Currently, Modbus TCP is not supported, only Modbus RTU.
Mr D Posts: 21 Rating: (4)
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This contribution was helpful to 1 thankful Users Abyrne

1/6/2010 4:45 PM	Rate (0)
davszym Posts: 1 Rating: (0)	I too am looking for this support. It is the one thing keeping me from using the siemens product in anything other than my stand alone systems. Wishlist please!
davszym Posts: 1 Rating: (0)
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3/2/2010 9:24 PM	Rate (0)
Rohit Bhatia Posts: 15 Rating: (0)	yes that would be great!! Modbus TCP is for some reason in great demand. Wishlist please!
Rohit Bhatia Posts: 15 Rating: (0)
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3/3/2010 11:44 AM	Rate (0)
Denilson Pegaia Diamond Expert Joined: 9/23/2005 Last visit: 12/24/2025 Posts: 4434 Rating: (1487)	Hi, the Modbus TCPis based on TCP comunication. The telegrams are not complex. In theory anyone could create a user program that mount / interpret this data struct and send/ recive it by "normal ways".
	Denilson Pegaia Siemens Industry Sector Technical Support
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3/3/2010 11:48 AM	Rate (0)
Denilson Pegaia Diamond Expert Joined: 9/23/2005 Last visit: 12/24/2025 Posts: 4434 Rating: (1487)	Hi, the Modbus TCPis based on TCP comunication. The telegrams are not complex. In theory anyone could create a user program that mount / interpret this data struct and send/ recive it by "normal ways".
	Denilson Pegaia Siemens Industry Sector Technical Support
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3/4/2010 2:43 PM	Rate (0)
Robster Platinum Expert Joined: 5/28/2008 Last visit: 11/11/2025 Posts: 1344 Rating: (141)	as far I know there is something on the way. Maybe a kind of library for easy using modbus read and write functions. But not as complex like ModbusRTU library. But like Pegaia said, it is nothing more then TCP communication.

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3/9/2010 3:53 PM	Rate (0)
Slack Posts: 30 Rating: (0)	Local tech support guy (out of Virginia) demonstratied the S7-1200 $ Modbus TCP comms to our drives using Modbus Function 23. We exchanged ~20 double words some formated as Integers, others as Reals. Worked quite well. (But like others have said it was custom code he wipped up. Looked to me like we was manually building the Modbus Header & Data Frame. Next was getting the code to support Functions 16 & 3 (As our Touchscreens do not support function code 23). I never went down that path as I found the touchscreen has an S7-300/400 driver and used it instead. I can put you in contact with him if you like, and (he agrees). He has stated that hs Modbus TCP work has 'turned into a national thing'.
Slack Posts: 30 Rating: (0)
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3/10/2010 9:01 PM	Rate (0)
glubb Posts: 26 Rating: (4)	can't you (or he) make it available via this forum? I really like this forum, but Virginia is ~5000 miles away...
glubb Posts: 26 Rating: (4)
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3/12/2010 3:03 AM	Rate (0)
Slack Posts: 30 Rating: (0)	glubb can't you (or he) make it available via this forum? I really like this forum, but Virginia is ~5000 miles away... That would be entierly up to him. I'll point out this thread to him.
Slack Posts: 30 Rating: (0)
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