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S7-1200 & Modbus RTU

Created by: Abyrne at: 7/10/2009 3:59 PM (8 Replies)

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7/10/2009 3:59 PM	Rate (0)
Abyrne Bronze Member Joined: 11/26/2008 Last visit: 12/8/2023 Posts: 101 Rating: (4)	I have an application i would like to create... I have a Sentron PAC 3200 power meter which i want to connect to the S7-1200 CPU1214. I need to gather data from the meter using Modbus RTU. I want this data to be then sent to a WinCC SCADA package. Can anyone help with setting up/configuration a project on this? I am having difficultly setting up the Modbus connection with the PAC3200. I am also not too sure about how to connect to the WinCC SCADA. Thanks for any help!
	Last edited by: CS Moderator at: 7/20/2009 11:31 AM new subject after splitting
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7/10/2009 4:37 PM	Rate (0)
Robster Gold Member Joined: 5/28/2008 Last visit: 10/23/2024 Posts: 1343 Rating: (141)	For Modubus RTU you need also a communication module for s7-1200 (RS232 or RS485). Then you can work with the blocks from modbus library. WinCC SCADA can work, but must'n. Like I wrote in the other thread you can try using S7-300 communication driver. WinCC flex works, I tested this already. From Siemens there is no official release. But I think they're working on this.

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This contribution was helpful to 1 thankful Users Abyrne

7/10/2009 5:04 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 12/26/2024 Posts: 4376 Rating: (1458)	Hi, in principle, it is possible to have Modbus TCP with TCP open connection and a user implementation of the Modbus protocol in the data package. So It isdone by S7-300/400 systems. However, there is no library already ready to use. You will need to read the Modbus protocol documentation (maybe in www.modbus.org) and implement it by yourself.
	Denilson Pegaia Siemens Industry Sector Technical Support
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This contribution was helpful to 1 thankful Users Abyrne

7/10/2009 5:13 PM	Rate (0)
Abyrne Bronze Member Joined: 11/26/2008 Last visit: 12/8/2023 Posts: 101 Rating: (4)	Creating a modbus libraryblock does not sound like fun! But i will have to try!

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7/13/2009 12:25 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 12/26/2024 Posts: 4376 Rating: (1458)	Hi, I'm sorry, I agree with you, it is a hard work. If you wish, you could use S7-300 to do this task (maybe a ET200S CPU). However, think in the oportunity: if you develop a solution (that really works), you can sell it.
	Denilson Pegaia Siemens Industry Sector Technical Support
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8/5/2009 4:39 PM	Rate (0)
JalejandrO Advanced Member Joined: 9/25/2008 Last visit: 10/21/2021 Posts: 8 Rating: (0)	I use this application connecting the pack directly to the WinCC Flexible using its Modbus/TCP driver, it works just fine, I really think you can do the same with WinCC Scada

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2/25/2010 11:10 PM	Rate (0)
tecnoall Posts: 7 Rating: (0)	Hi, JalejandrO, could you share me your wincc flexible project, Thanks in advance
tecnoall Posts: 7 Rating: (0)
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2/26/2010 9:24 PM	Rate (0)
mzunigat Posts: 16 Rating: (0)	Dear: The best way to connect once PAC 3200/4200 to Scada is simulate CPU Premiun Micro. this way Siemens recomend and work well. attach file for that you follow the step and them your can send the information to PLC. Good Lucky Attachment Modbus TCP WinCC and Pac4200.pdf (360 Downloads)
mzunigat Posts: 16 Rating: (0)
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3/18/2010 7:38 AM	Rate (0)
Brander Regular Member Joined: 7/14/2008 Last visit: 4/25/2023 Posts: 3 Rating: (0)	Siemens has informed me that they are making a standard block for PAC 3200 to the S7-1200 CPU, and that this is coming in about one month

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