Skip to Content

Register Login

Industry Online Support

Technical Forum

Navigation

Communication between TM831 and RIO S7 via RS232 or RS485

Created by: drozerce at: 12/22/2009 3:08 PM (6 Replies)

Rating (0)

Thanks 0

7 Entries

12/22/2009 3:08 PM	Rate (0)
drozerce Bronze Member Joined: 6/3/2009 Last visit: 9/14/2022 Posts: 118 Rating: (2)	Hi everyone, I have a TM831 (Three phase electronicmulti function meter)that is not Siemens. This TM831 has a modul that has RS485. Additional can be add another modul with RS232. This TM831 device has own softwere. My question is: From this TM831 I want to read measured values (for ex. Current, power etc.) Is it posible to make conection between this TM831 device and RIO (S7 -300/400) via RS485 or RS232? Is there modules for RIO that has RS485/RS232 ports? Do I need special code to read values from this TM831? Because this TM831 has it's own softwere, do I need to make changes in that softwere after I make the conection via RS232 to PLC(because the specification for TM831 says that the modul RS232 that can be added, can be configured in the factory that makes it, and after that you justneed toadd itto TM831 device)? Does anyone had has situation like this one, or can refer me to someone else? In attachment I'm sending you picture to clearify all this. Thanks Attachment TM831 and RIO.JPG (155 Downloads)

Suggestion To thank Quote Answer

12/22/2009 4:41 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 10/4/2024 Posts: 12283 Rating: (2685)	Hello drozerce; Connecting your PLC to the meter using RS-232 or RS-485 is comparable to establishing a telephone link between 2 users: it is useful only when the users speak the same language, or else they cannot understand each other. ÙJust to gibve you an example, RS-485 is the physical layer for both Profibus-DP and many Modbus-RTU applications. Since I cannot find a link to your particular meter (possibly you could give us an address?) I have to ask you to verify in your available manuals what exchange protocol it uses: if it can "talk" Modbus, or ASCII for example, then you could use a CP 340 or CP 341 to exchange data in serial mode. If it has a proprietary protocol you might have to program your exchange strings in the CPU, which could mean some work (but it can be done). Are other protocols available with the meter, Profibus, Ethernet? Hope this helps, Daniel Chartier

Suggestion To thank Quote Answer

12/23/2009 9:40 AM	Rate (0)
drozerce Bronze Member Joined: 6/3/2009 Last visit: 9/14/2022 Posts: 118 Rating: (2)	Hello Chartier and thank you for your replay, Here is the technical description for TM831 (attachment). From that what I read, it has IR Fiber Optical communication interfaceand thepurchaser told me that it has RS485. I also read that optional can be added RS232, Ethernet modul etc. And if everything is ok, I mean if I can make communication between TM831 and some CP (S7), after that in my S7 SW how I can see which byte is what (for ex. first byte is current, second byte is voltage etc.) something like when I use ABB drives and Siemens PLC (for communication between Siemens and ABB I know that it has in the ABB manual which byte is what)? You said that it has some work, but that is ok. But how? How I can make this? I don't know if you understand me, maybe my english is not good as I think it is Best regards Attachment MT 830 i MT 831.pdf (152 Downloads)

Suggestion To thank Quote Answer

12/23/2009 5:12 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 10/4/2024 Posts: 12283 Rating: (2685)	Hello drozerce; In the pdf file from Iskraemeco, they mention IEC 6205x protocol support. On their website, they specify IEC 62056 communications on their modules, even over modem lines and GSM. And they do not mention OPC as a possible solution. I personnaly have never worked with or studied these IEC 6250xprotocols; difficult for me to help you there, unfortunately.Siemens A&D division does not work often with what we call "substation protocols", although recently PCS 7 communication blocks for IEC 61850 have been developped. However, in Siemens' Energy and Automation division (formerly SiemensPower generation), you will find some communication modules for SICAM (based on S7-400 CPUs) that are described this way: Typically, these solutions are either based on the large system component AK 1703 ACP (19” rack design) or on the compact TM 1703 ACP (DIN-rail mounted). Like all members of the SICAM 1703 family, they can be equipped with different combinations of communication, both serial and Ethernet (TCP/IP). Different protocols are available, mainly IEC standards, e.g., IEC 60870-101/103/104 IEC 61850, IEC 62056-21, but also a lot of other well-known protocols from different vendors (product description section 6.3-2). You can look at the complete document on this link: https://www.automation.siemens.com/mcms/totally-integrated-power/de/Documents/Power_Engineering_Guide_2008.pdf?HTTPS=REDIR I know some members here have integrated SICAM modules in their S7 projects, in just such cases. Maybe they can chime in with their experioences. Hope this helps, Daniel Chartier
	Last edited by: dchartier at: 12/23/2009 5:17 PM
Suggestion To thank Quote Answer

3/3/2010 9:18 AM	Rate (0)
drozerce Bronze Member Joined: 6/3/2009 Last visit: 9/14/2022 Posts: 118 Rating: (2)	Hi DChartier, Thanks for the manual, it seems ok. But I need more information about SICAM. If you can connect me with someone that has more experience with this. I need to ask some more questions, so if you can do that, then that will be just fine. Thanks again

Suggestion To thank Quote Answer

3/5/2010 6:29 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 10/4/2024 Posts: 12283 Rating: (2685)	Hello drozerce; There are a few members who work with SICAM, so a general call on the orum could locate some willing helpers for you. The best contact for you should be Mike J, who works for the Energy division that produces the SICAM line. Just look him up in the forum Search box, you should find a few threads he has answered recently. Hope this helps, Daniel Chartier

Suggestion To thank Quote Answer

3/7/2010 1:41 PM	Rate (0)
roberoi Posts: 1 Rating: (0)	You may like to study specs of Arctic Modbus Gateway for your use, RS 232 / RS 485 are inbuilt
roberoi Posts: 1 Rating: (0)
Suggestion To thank Quote Answer

|

Share this page:

Share this page on...

Follow us on