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| 12/8/2009 5:53 PM | |
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Posts: 65 Rating:
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without using DP-DP coupler is this communication possible??????????????? |
| 12/9/2009 2:03 AM | |
Joined: 5/28/2008 Last visit: 9/9/2024 Posts: 4515 Rating:
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Dear deepak.samal05, I am not sure if I have understand your question correctlly. If you have two redundant CPUs and you have some remote I/Os (ET200M for instance) and you want to connect the CPUs to the remote I/O station, you have to use RED-BUNDLE. Red-bundle consists of two IM153-2 and one Bus unit IM/IMto be mounted on the rear of them. Then you can install signal module up to 12 modules using active bus units. There are other examples in the attached brochore. If my answer does not meet your requirements, please explain your question by a drawing. Regards, Attachmentbrochure_simatic-controller_en.pdf (237 Downloads) |
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Ayman Elotaify |
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| 12/9/2009 6:07 PM | |
Joined: 9/27/2006 Last visit: 9/16/2024 Posts: 12282 Rating:
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Hello deepak; So you have 2 CPUs setup as DP-masters, each with their ET 200Sslave. You are using the integrated Profibus connector on the CPUs for the Profibus exchanges. Correct? I see 2 ways of doing what you want to do: 1) using the Profibus-DP interface on the CPUs; 2) using the MPI port; 1) using the Profibus-DP interface on the CPUs; A Profibus interface can only be setup as master, or as slave, not both at the same time. An an integrated Profibus interface (the one on the CPU) cannot be setup for peer-to-peer exchanges (what is known as an FDL connection), so you cannot use Profibus FBs to exchange master-to-master. So, if you do not want, or cannot use additionnal hardware (the DP/DP coupler would be the standard recommendation in this case, or CP 342-5 Profibus CPs for FDL connection) you can finnagle your way by doing this: -Deternine the one CPU you will keep as a DP-master; -Change the other CPU to slave status; I believe you already have access to FAQs that show you how do do the master-slave comms between a CPU master and a CPU slave; -Configure both ET 200S as slaves to the master CPU. -Connect the ET 200S stations and the CPU slave in daisy-chain fashion, using proper Profibus cable and connectors; -Finally read/write all values from the ET 200S stations in the master CPU, and then write the data from the second IM 151 to the second CPU, so its program can take action based on the status of its original slave (vbasically use the CPU master as a bridge between the second CPU and its original ET 200S slave); This will require some work, and a bit of testing to make sure everything communicates properly. But it is doable. And you will save on the hardware. 2) using the MPI port; Leave tyour Profibus-DP setup as is, and use either an MPI cable (5m max) or Profibus cable and connectores (50m max without repeaters) to connect the MPI ports of each CPU. Then use Global Data configurations or communication FCs/FBs (such as SFC 65 "X_SEND, and SC 66 "X_XCV", or SFC 68 "X_GET" and SFC 67 "X_PUT")to write data from one CPU to the other. Look at the attached document explaining different aspects of MPI connections that you can use. Hope this helps, Daniel Chartier AttachmentCommunicationBook_MPIPart_e.pdf (309 Downloads) |
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