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CPU315-2DP to Deltav through CP342-5

Created by: Lo_quik at: 5/4/2010 2:47 PM (7 Replies)

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5/4/2010 2:47 PM	Rate (0)
Lo_quik Posts: 3 Rating: (0)	Hi Experts, I'm working on a project based on a DeltaV DCS and few packages controls by CPU315-2DP. On several packages, we communicate through the profibus port of CPU, we have a 2 DB for exchange (1read & 1 write) and the communciation is define in Profibus properties/configuration with some slots (see attached picture) Unfortunately, one of my packagist is using a CP342-5 to communicate with our deltaV. Emerson programmer don't want to use a different way to communicate, so they want this type of "mapping" and two DB. I'm trying to find how two configure this. My config': CPU315-2DP is master with ET200S on profibus network 1, CP342-5 is Slave on profibus network 2 DeltaV is Master on profibus network 2 In GSD file of CP342-5, I find this, I understand that it's possible to create this mapping ;<Modul-Definition-List> ;************************************************************************** ; BYTE MODULES (spezielle Kennungsformate) ;************************************************************************ ;************************ I N P U T ********************************* ;************************************************************************** ; input * byte constcy * byte data * 1..64 byte ;********************************************************** Module = " 1byte DI/constcy 1byte " 0x40,0x00 EndModule Module = " 2byte DI/constcy 1byte " 0x40,0x01 EndModule Module = " 4byte DI/constcy 1byte " 0x40,0x03 EndModule Module = " 8byte DI/constcy 1byte " 0x40,0x07 EndModule Module = "16byte DI/constcy 1byte " 0x40,0x0F EndModule Module = "32byte DI/constcy 1byte " 0x40,0x1F EndModule Module = "64byte DI/constcy 1byte " 0x40,0x3F EndModule And I have more or less the same in GSD file for CPU315-2DP Thnaks for your help. BR Laurent Attachment Configuration.jpg (400 Downloads)
Lo_quik Posts: 3 Rating: (0)
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5/5/2010 2:33 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 12/9/2024 Posts: 3028 Rating: (1057)	Hello Lo_quik you will be able tocreate (almost) the same DP Slave I/O config for a CP342-5 as you usually do for the onboard DP port of your CPU. "Almost", because your onboard DP port I/O config uses 244 Bytes of Inputs (i.e. the maxpermissble number of Bytes for a DP Slave). A CP342-5 as a DP Slave is however "limited" to 240 Bytesmax of Inputs (and/or Outputs), so you will have to live with 4 Bytes less of data. There are plenty of FAQ's, Forum questionsand examplesto be found on the Siemens web concerning the usage of the CP342-5 and below are a few "main" ones (which themselves contain further links). 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? Notes on linking a CP342-5 as DP slave to a DP master with STEP 7 What master/slave communication options are available on PROFIBUS DP? Simatic Net Quickstart Profibus DP examples I hope this helps
	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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5/5/2010 3:31 PM	Rate (0)
Lo_quik Posts: 3 Rating: (0)	Hi Fritz, Thanks for the answer. Unfortunately,I have already read most of the link you send to me but none of them give the explanation about how to configure this DP link as shown on the picture attached to my previous post. I think this is mainly due to a lack of vocabulary on my side. I read this: "You can use a data block, the marker area or the I/O area for this." Is "I/O area " is the method I want to use? If yes, how should I configure it ? Thanks for helping me. Laurent
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5/5/2010 3:56 PM	Rate (0)
J_Bell Posts: 5822 Rating: (412)	Dear Laurent, you can stay away from tne E/A fields used within CPUs because the CP uses virtual I/O. This virtual I/O may be mapped directly to the DB you want to use anyway, this is an advantage, isn't it? This way you can save the time and program memory you need to move the data form the I/O to the DB because the used functions, DP_SEND / DP_RECV (FC 1 and FC 2 from the S7-300 folder of the SIMATIC NET library, already to the job. Best regards J_Bell
J_Bell Posts: 5822 Rating: (412)
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5/7/2010 3:55 PM	Rate (0)
Lo_quik Posts: 3 Rating: (0)	Hi J_Bell Thanks for the answer. I discuss about your response to Emerson, which is in charge of coding the deltaV system. It seems that there is only one way to configure the profibus DP communication (in deltaV), and it's with the mapping solution, (what I understand being the virtual IO). So, even if through the CP342-5, we can use the DP_Send and DP_Receive, is it possible to use the mapping instead of FC1/FC2? If yes, how can it be done? Because when I read the GSD file, I see the same structure than a GSD for a CPU315-2DP. Thanks for your help.
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5/7/2010 4:24 PM	Rate (0)
J_Bell Posts: 5822 Rating: (412)	Dear Laurent, I must admit... I do not get your point. Where is your problem? The virtual I/O is not seen by Emerson at all. The only place you notice the difference is within the CPU program where the CP 342-5 is located in. You only have to adjust the PLC program in the S7-300 this way. Emerson will not notice any difference from remote. Best regards J_Bell
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5/8/2010 3:29 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 12/9/2024 Posts: 3028 Rating: (1057)	Hello Lo_quik I think there's some confusion going on here, so let me try to clarify: Lo_quik It seems that there is only one way to configure the profibus DP communication (in deltaV), and it's with the mapping solution, (what I understand being the virtual IO). The deltaV is aDP Master, your S7 PLC is a DP Slave (via a CP342-5 in this case). The DP Slave needs to be configured in theDP Master and the DP Master will then exchange I/O's with the DP Slave (let's call them "Profibus I/O's" from now on). The main(and basically only) difference for the Emerson Engineer is that he will have to configure a CP342-5 as a DP Slaverather than a 315 CPU (i.e. he will use a different GSD file). The only other difference is that he can only configure/use a maximum of 240 Bytes of I/O's rather than 244(see also my previous post). The bottom line (for the Emerson Engineer) though is: He'll still have the same data exchange mechanims as before in his DeltaV! Lets leave the DP Master and move over to your end (the315 CPU with a CP324-5 as a DP Slave): You will no longer "see" the Profibus I/O's in your CPU as the CP342-5 takes care of this, instead you willexchange data betweenyour CPU and the CP342-5 via FC1 & 2. You will also NOT configure any I/O's directly in the HWconfig setup of your CP342-5 (you would have done this when you used the CPU's oboard DP port as a DP Slave). Instead the lenght of the DB's that you ideally use for data exchange between the CPU and the CP342-5 now determine the overall amount of data that you exchange. You will find a fair few examples in the previosuly listed links, have a another look at the ones that have a CP342-5 as a DP Slave (and ignore the S5 or S7 Master configuration part on the examples) Lo_quik So, even if through the CP342-5, we can use the DP_Send and DP_Receive, is it possible to use the mapping instead of FC1/FC2? I don't quite understand what you mean by this, but hope the above clarified this question too. One last thing, if you haven't bought the CP342-5 yet, a DP/DP coupler may be an easier solution or at least something to consider for the future. I hope this helps
	Last edited by: fritz at: 5/8/2010 3:33 PM 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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This contribution was helpful to 2 thankful Users J_Bell dchartier

4/11/2014 2:52 AM	Rate (0)
ojven2014 Posts: 3 Rating: (0)	Hi, Please Attach the S7 Project, in both cases with cp-342 as slave and in case on cp 315-2dp as slave, i have some issues in this case with deltav emerson. thanks.
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