Profibus communication between two CPU314C-2DP
Created by: Flevange at: 9/2/2016 12:34 PM (5 Replies)
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| 9/2/2016 12:34 PM | |
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Posts: 12 Rating:
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Hello everybody I want to establish a profibus communication between 2 cpu314c-2dp .Each cpu is connected with one panel ktp 1200 basic cpu 1with t.p1 for machine 1 and cpu2 with t.p2 for machine 2. I want the 2 machines to share some common functions (alarms etc)and the operator of the machine to be able to see the alarms and the state of the machine 2 at the panel 1 and vice versa. Is this feasible?What other modules do I need for this task except these shown in the attached diagram?Are there some tips step by step for the software programming for this task? Thank you in advance. AttachmentPROFIBUS DIAGRAM.pdf (160 Downloads) |
| 9/2/2016 3:17 PM | |
Joined: 9/27/2006 Last visit: 3/18/2025 Posts: 12344 Rating:
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Hello Flevange; If you want to exchange data between 2 S7-300 CPUs that are setup as Profibus master, your only option is to use a DP/DP coupler. Any other type of exchange between masters (communication functions for S7 connections, for example) require a Profbus CP 342-5 in the rack. Here is a basic dicument explaining how the DP/DP coupler is used in a Profibus network, how it is setup and commissioned to exchange datablocks between DP masters.: https://support.industry.siemens.com/cs/fr/en/view/1179382 Basically.the coupler is constructed as a dual DP slave; it has 2 DP slave interfaces, each one is attached to the Profibus network of a different master. As a slave, it can exchange up to 244 bytes OUT and 244 bytes IN between the 2 masters, and there is nothing to program; the only requireent is a correct configuration. To prepare the data you will exchange between the masters, you should create 2 DBs in each master's porgam, one for the s=data sent to the other master, one for the data recieved. Then copy to the send DB all the alarm information you want to exchange, inside the master's program, so the DB is written to dynamically during the program RUN. That will also give you an idea of the size of the data you will exchange. Check out the manual above to get a feel of what is to be done. Come back to us if you have moe questions. Hope this helps, Daniel Chartier |
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| 9/2/2016 3:38 PM | |
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Posts: 12 Rating:
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Dear dchartier Thank you for your advice. I will check it more . Best Regards. |
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