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Cominication between VS710 and CPU 315-2DP

Created by: mr83 at: 6/8/2010 8:00 PM (4 Replies)

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6/8/2010 8:00 PM	Rate (0)
mr83 Posts: 3 Rating: (0)	Hello to everybody, I need help with this thread. I had a CPU 315 with a CP 342-5 (Profibus) connected to a VS 710 (Vision). Now I want to change the CPU to a 315-2DP without the Profibus card (CP 342-5) but I dont know if I know that I need change the HW in the program but I dont know if I need change the program (DB, FC or UCT). If the program was made for CPU 315 with a CP 342-5 (Profibus) its necessary change something if i change the CPU to a 315-2DP ? Thanks a lot Greatings to everyone
mr83 Posts: 3 Rating: (0)
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6/8/2010 11:33 PM	Rate (0)
Hulzhex Gold Member Joined: 8/25/2005 Last visit: 1/29/2025 Posts: 1162 Rating: (111)	Hello mr83, using the CP, there are the functions DP_Send and DP_Recv within your program. This wouldn't be needed anymore. The I/O data of your slave will be found within the I/O data of the CPU. Maybe there are DP_Diag and DP_CTRL too? Please check this. They would be obsolete too. Best regards Sabine

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6/9/2010 5:18 AM	Rate (0)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 3/17/2025 Posts: 4518 Rating: (843)	Hello, Basically, if you have changed the CPU, you have to modify the HW config and download again on the new CPU. In your case, you will use the integrated profibus DP port of the CPU instead of using CP. Then you will remove the CP from the old HW config. You will connect the vision sensor to the DP port of the CPU. And to achieve the same functionallity of the old system, do not forget to keep the profibus network baud rate the same as that of the old system. I recommend to use the same profibus addresses for all slaves on the profibus network and also to use the same I/O addresses to avoid re-wiring. Hope this helps.
	Ayman Elotaify
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6/9/2010 6:58 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/18/2025 Posts: 3042 Rating: (1061)	mr83 If the program was made for CPU 315 with a CP 342-5 (Profibus) its necessary change something if i change the CPU to a 315-2DP ? Hello mr83 apart from the HWconfig changes thatAyman Elotaifyalready outlined, there is one more additional change that you will have tomake. Put simple, your program will currently communicate with the CP 342-5 via pre-programmed Siemens FC'scalled DP_SEND and DR_RECV (default numbers are FC 1 and FC 2, but these can be changed). DP_RECV will take all (Profibus) Inputs from the CP342-5 and (typically) put these into a DB from which your program accesses them. Conversely, your program will write all CP342-5 related (Profibus) Outputs (typically) into a DB from which DP_SENDwill take them and write them to the CP342-5. Your program may also additionally use the (optional) FC's DP_DIAG and DP_CTRL (default numbers are FC3 and FC4). You can NOT use any of the four above mentioned FC's 1 to 4 anymore if youuse the onboard DP port of the CPU and will have to rewrite this part of the logic. Good news is that it is in general simpler to use the onboard DP port of the CPU as you now have direct access to the Profibus I/O's, bad news is that you will have to change your program. Have a look too at SFC 14 and 15 which may come in handy to replace DP_SEND and DP_RECV (note though that you'll need one SFC14/15 call per I/O module per DP Slave). Below are a few links which have more on this subject and I hope they help with the "reverse Engineering" of your logic from CP342-5 to the onboard DP port: What should you watch out for when configuring a CP342-5 as DP master? What are the differences between an integrated DP interface of my CPU (e.g. CPU 315-2 DP) and the DP interface of the CP 342-5? Which entries deal with consistent data in conjunction with distributed I/O?
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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6/9/2010 2:25 PM	Rate (0)
mr83@ Posts: 4 Rating: (0)	Hello fritz, Thanks a lot for the advice. Il will try to do that. I have in my program a FB106 SEND_CP, FB107 RECV_CP, FC1 DP_SEND and FC2 DP_RECV, if i understand correct, i will dont need this anymore, but i need to do again this part in the program for that i can continous with my comunication between CPU 315-2DP and my cam VS710. The system is working in a machine that work everyday.....and i hope that the change that i will make will be ok...because time is money Thanks a lot to everyone. Greatings
mr83@ Posts: 4 Rating: (0)
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