Skip to Content

Register Login

Industry Online Support

Technical Forum

Navigation

Setting up a DP/DP coupler

Created by: Sean Greaves at: 3/4/2007 9:08 PM (7 Replies)

Rating (0)

Thanks 1

8 Entries

3/4/2007 9:08 PM	Rate (0)
Sean Greaves Experienced Member Joined: 9/27/2006 Last visit: 1/17/2022 Posts: 62 Rating: (0)	Hi Can anybody on the forum help me with how to set up data exchange using a DP/DP coupler. I have set up the data I/O in hardware config but am unsure on how to send and recieve data. Any examples would be helpful. My PLC is a S7-300 315-2-DP. Thanks

Suggestion To thank Quote Answer

3/5/2007 4:18 AM	Rate (0)
usjwo Posts: 36 Rating: (9)	You don't need any special function to receive and send data. Use it like normal input and output.Receive data – read from inputs area, send data – write to outputs, that’s all. Regards Usjwo
usjwo Posts: 36 Rating: (9)
Suggestion To thank Quote Answer

3/5/2007 11:19 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 11/17/2023 Posts: 2705 Rating: (318)	Hi Gengus, It is very easy, just program the first time one byte output on system A and one byte input in system B. The DP/DP-coupler is for both systems a slave. When it is the new coupler then the first bit in the first byte can be used to look if the other system is working well (something like a alive bit). This can be chosen with the dipswitches on the coupler. When that is working you might couple 2 and 4 bytes also easy, therefore are some commands to read them out like "L IW..." "L ID..." when you want to do 3 bytes or more then 4 bytes then you have to use SFC14 and SFC15 to get the data at onces into the CPU. When it is in the PII or the PIQ then it is not necessarry to use SFC14/15. Please also see the handbook: DP/DP Couplerfor further information about the dipswitches and so on....
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
Suggestion To thank Quote Answer

3/7/2007 9:09 PM	Rate (0)
Sean Greaves Experienced Member Joined: 9/27/2006 Last visit: 1/17/2022 Posts: 62 Rating: (0)	Late I need to send data from analogue temperature inputs and i think only receive on/off data, resetting faults etc. Do i use the function you metioned. Once again thanks for your help. Gengus

Suggestion To thank Quote Answer

3/11/2007 1:58 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 11/17/2023 Posts: 2705 Rating: (318)	Gengus I need to send data from analogue temperature inputs and i think only receive on/off data, resetting faults etc. Do i use the function you metioned. Dear Gengus, The DP/DP coupler don't need to know what type of data is transfered. The only thing whats needed for analog values is that they are transfered at once, they call it consistent, for doing that with analog you may use words consistent. Every data that must stay together must transfered consistent!
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
Suggestion To thank Quote Answer

8/24/2007 9:21 PM	Rate (0)
Darren_T3 Posts: 95 Rating: (10)	Hi Late, I was Searching for a thread just like this and had a follow up question to your previous reply. I am also setting up a DP/DP coupler and was wondering what the difference was between the consistent I/O and the ‘non-consistent’ I/0. From reading your reply I understand that consistent data needs to ‘stay together’ is that correct? Perhaps if you can elaborate just a bit more will help me in my clarity on the subject. Also in the manual example (Section 4.3.4) their setup has several listings for inputs and outputs both consistent and not and a universal module. Do you have any tips on knowing when to use these module types? For example when would a universal module be a better choice compared to a fixed module size? Another thought I have is if I was passing data from multiple DB’s would I set up a module for each DB or just calculate the largest amount of data from all of my ‘sources’ and choose that module size? If the data was just BOOL and an occasional Word or DW would that be considered ‘non-consistent”? Thanks for all your continued advice! Cheers, Darren in Dallas
Darren_T3 Posts: 95 Rating: (10)
Suggestion To thank Quote Answer

6/11/2008 8:40 AM	Rate (0)
Sean Greaves Experienced Member Joined: 9/27/2006 Last visit: 1/17/2022 Posts: 62 Rating: (0)	Hi Darren I was also interested in how to send data blocks of information, containing real, words and bool types. Did you get a response to your question. Also when to use the universal module the handbook does not explain very well. Regards Gengus

Suggestion To thank Quote Answer

6/15/2008 5:14 PM	Rate (0)
jklm Platinum Member Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (308)	Hello all together There is an interesting FAQ about consistency of data in distributed IO in general (a DP/DP coupler is just one possibility among others). http://support.automation.siemens.com/WW/view/en/28991143 Download the "description" from the site, and you will have a good idea what consistent data is. You will see alsoa lot of other entries about consistent data. I hope this help.
	Last edited by: edr at: 6/15/2008 5:21 PM Best regards jklm Suggestion was helpful? Feel free to rate it.
Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users oluwasedago

|

Share this page:

Share this page on...

Follow us on