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DP DP COUPLER

Created by: Eastern at: 6/5/2008 6:24 AM (4 Replies)

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6/5/2008 6:24 AM	Rate (0)
Eastern Posts: 557 Rating: (64)	HI i am using s7 400 cpu 414 4h system , 2 dp dp coupler, networking is one dp dp coupler is connected on one plc, another one is connected to another plc, both dp dp coupler's are connected to each other with profibus cable, the same line is going to third party plc. is this configration work or not....... vivek
Eastern Posts: 557 Rating: (64)
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6/5/2008 8:13 AM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 3/20/2023 Posts: 11992 Rating: (2573)	Hello viveks; I have tried to illustrate the setup you are suggesting; as I understood this each S--414-H CPU would act as an independant mster on Profibus, and you would use thje DP/DP coupler as an exchange medium with a 3rd PLC, also a Profibus Master. There is one problem I see with this setup: in a primary/standby redundant system, the standby DP-master would not be active while the primary is active, and the contrary would also be true. So the data transfered through the DP/DP coupler would not be valid when its S7-414H CPU was not active. You could of course use the DIA setting (I/O data validation) functions on both couplers and use the first byte transfered to validate the status of the tramsitting master's data. But I fear this could lead to invalid decisisons in PLC3 based on invalid data. Please correct me if my interpretation is wrong. The second drawing illustrates the "accepted" way of transfering data between redundant H-system PLCs and a 3rd slave; this at least is supported by Siemens and you would get support in case of problems. Hope this helps, Daniel Chartier Attachment S7Hsystem_DP.jpg (112 Downloads)

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6/6/2008 11:06 AM	Rate (0)
Eastern Posts: 557 Rating: (64)	HI dchartier Your observation is right, but my problem is third party plc (YOKOGAVA) is master only, in case I can go only master master communication, does this configuration work. Or if u have a other idea about this please let me know, but my all plc’s are master & I have to exchange the datavivek
Eastern Posts: 557 Rating: (64)
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6/6/2008 4:59 PM	Rate (0)
J_Bell Posts: 5822 Rating: (411)	Hello, may I ask you how you want to detect which of the two DP/DP couplers is connected with the current active PLC part of the H System? Best regards J_Bell
J_Bell Posts: 5822 Rating: (411)
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3/8/2009 7:47 AM	Rate (0)
Eastern Posts: 557 Rating: (64)	hi i am using 2 DP-DP coupler for both H-system independently. i will make a program by using a OR GATE, in same way in yokogava i will incall 2 gsd file for DP-DP coupler, & communicate. regards vivek
Eastern Posts: 557 Rating: (64)
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