10/1/2015 8:47 PM | |
Joined: 1/24/2009 Last visit: 3/29/2024 Posts: 85 Rating: (7) |
Hi again, thank you for your answers. The 4 loadscells of the installation will be connected to the DGT4PB module = Transmitter indicator. Attached is the datasheet of this transmitter. It refers that DGT4PB will be eqquiped with : 1 RS232 bidirectional port and PROFIBUS. There are A and B terminals on the terminal strip of this transmitter. Unfortunately, we have not bought it yet to make a simulation. From this transmitter, we just need to transfer the weight measurement to S71200 system ( CPU 1214 ) using RS485 two wire connection. Instead of RS485 we could use analog output of the transmitter but it will not be enouph accurate. Is CB1241, able to handle this connection or we must buy CM1242-5 ? We have not used CB1241 in the past. I suppose that all necessary blocks are inclluded in TIA portal v13 ? AttachmentDATASHEET-DGT.pdf (324 Downloads) |
10/1/2015 10:28 PM | |
Joined: 7/7/2010 Last visit: 9/24/2024 Posts: 15221 Rating: (2417)
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To make it easy, I would suggest downloading the GSD file, add it to your project, and see the options you get with the built in gsd configuration ( see this link http://www.vetek.com/Weighing-Transmitter-4-channels-Output-RS232Profibus-DGT4PB-en/article and download this file Profibus GSD mm.rar ) If it provides all your options, you are in good shape. Since profibus can be networked, you may need to consult with the manufacturer to see how to set up a network of these devices before deciding how to proceed. If they can only be networked with native rs485, that is the answer to your question for which comm module. If you have to go rs485, good luck. It will be on your to make them all work reliably and smoothly. The blocks available for sending and receiving exist. What does not exist is the infrastructure to package up text char arrays and / or strings and send/receive them asynchronously with relative ease. It is possible and not too awful difficult, but it does require some patience making it work. If you can use profibus, that would save you countless hours of development time and make your life so much better.
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