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How to establish multiple master in Profibus-DP

Created by: SonNH at: 11/8/2010 12:05 PM (5 Replies)

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11/8/2010 12:05 PM	Rate (0)
SonNH Posts: 50 Rating: (1)	Dear all I want to establish multiple master in Profibus-DP network. In my project, I use 2 type of comunications, Ethernet and Profibus-DP, containts: 1. Ethernet: S7-400 Station with CPU414-3 and CP443-1. I use CP443-1 to connect S7-400 station with 2 OSs via Ethernet and I think it's ok. 2. Profibus-DP: 2.1. S7-400 Station with CPU414-3 used as Profibus master. I also attached 2 ET200M as slave of this master. 2.2. S7-300 Station with CPU314C-2DP used as master with 1 slave ET200M. 2.3. Another Station S7-300 with CPU314C-2DP. Can I establish multiple master in Profibus-DP network? Is possible with 3 master in this case? Do I need more hardware for that? Please help me soon Thanks Best regards
SonNH Posts: 50 Rating: (1)
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11/8/2010 12:19 PM	Rate (0)
Ammy Platinum Member Joined: 4/19/2008 Last visit: 11/21/2024 Posts: 1525 Rating: (159)	SonNH Dear all I want to establish multiple master in Profibus-DP network. In my project, I use 2 type of comunications, Ethernet and Profibus-DP, containts: 1. Ethernet: S7-400 Station with CPU414-3 and CP443-1. I use CP443-1 to connect S7-400 station with 2 OSs via Ethernet and I think it's ok. 2. Profibus-DP: 2.1. S7-400 Station with CPU414-3 used as Profibus master. I also attached 2 ET200M as slave of this master. 2.2. S7-300 Station with CPU314C-2DP used as master with 1 slave ET200M. 2.3. Another Station S7-300 with CPU314C-2DP. Can I establish multiple master in Profibus-DP network? Is possible with 3 master in this case? Do I need more hardware for that? Please help me soon Thanks Best regards Hi SonNH, For your Configuration I suggest you the DP-DP Coupler, so in that it will work with all DP Master configuration. Have a look on the Manual,
	Ammy New for every one.............. “No duty is more urgent than that of returning thanks.” If Problem Solved......! I can't help you privately - please post in the Forums
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11/8/2010 1:10 PM	Rate (0)
SonNH Posts: 50 Rating: (1)	Thanks Ammy Is there another way to do multiple master with my project? So, I've checked again specification of CPU414-3, which has 2 Profibus port. Can I build 2 subnets of Profibus-DP with S7-400? Thanks BG
SonNH Posts: 50 Rating: (1)
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11/8/2010 1:53 PM	Rate (0)
umencho Diamond Expert Joined: 3/21/2006 Last visit: 3/19/2025 Posts: 10239 Rating: (1183)	Hello, Yes, you can. My suggestion is: In the first (MPI) port to exchange data with one S7-300 (limited quantity of data). (MPI network http://support.automation.siemens.com/WW/view/en/747743). In othe other port (Profibus) to exchange data with S7-300 (like Profibus slave) or via DP/DP Coupler with S7-300 (like Profibus Master).(Profibus Network). Or in both ports to build Profibus network and to exchange data with slaves. (Profibus network). Of course you could have mix of both previous case if you add one interface card in 416-4 CPU. (MLFB 6ES7964-2AA04-0AB0INTERFACE MOD. DP-MASTER F. S7-400) BR, Hristo Mihalev
	Last edited by: UMENCHO at: 11/8/2010 1:56 PM Last edited by: UMENCHO at: 11/8/2010 1:54 PM
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11/9/2010 5:19 PM	Rate (0)
SonNH Posts: 50 Rating: (1)	Dear UMENCHO Would you like to explain for me differents of DP-slave and DP Intelligent-slave? Assume I've got one S7--300 station as DP I-slave, S7-400 station as DP-master. So, can I connect directly one ET200M to DP I-slave? Thanks Best regards
SonNH Posts: 50 Rating: (1)
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11/9/2010 8:05 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 3/19/2025 Posts: 12344 Rating: (2707)	Hello SonNH; I am afraid I do not exactly understand what you are trying to do here, but I will try to clear up a few issues. An I-slave is an "intelligent"Profibus-DP slave (based on an S7 CPU) that can exchange data with another I-slave, in a mechanism called "Direct data Exchange" (DDX), instead of having the DP master tranfer the data between the slaves. In the following FAQ, yuou will fing a great explanation of this DDX function, and a link to a sample project and a list of DDX-capable slaves. http://support.automation.siemens.com/WW/view/en/15196761 Now, if I have understood you well, you would like to have DDX between a slave CPU and ET 200M module. Based on the list of I-slaves mentionned eearlier, this is not possible. You could simply establish both the S7 CPu and the ET 200M as regular slaves to the Profibus master in your project. If I have not cleared up the issue, please come back with more detailed questions. Hope this helps, Daniel Chartier

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