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CPU 315 2DP and Danfoss drive comm via Profibus DP

Created by: manmeet at: 1/17/2006 1:26 PM (9 Replies)

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1/17/2006 1:26 PM	Rate (0)
manmeet Gold Member Joined: 1/3/2006 Last visit: 2/19/2024 Posts: 726 Rating: (71)	Hi there, I'am writing a program in Simatic Manager( CPU 315 2DP), which comunicates with Danfoss drives (VLT 5000) via Profibus DP. In hardware configuration I have selected PPO type 5. I have written these lines to read data from drive. CALL SFC 14 ;Reads data from Standard DP Slave. LADDR :=W#16#178 ;Address of Drive RET_VAL:=#temp RECORD :=P#DB10.DBX20.0;Place where data is bing stored. My question is in which Word will the value of Frequency get stored ????? Will it be DB10.DBW20 or DB10.DBW30 ? or some other place?
	Last edited by: CS Moderator at: 5/2/2006 4:25 PM Edited Subject from Dnafoss to Danfoss
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1/17/2006 3:10 PM	Rate (0)
Hulzhex Gold Member Joined: 8/25/2005 Last visit: 10/5/2024 Posts: 1162 Rating: (111)	Hello manmeet, I'm not an specialist for drives communication. But I have used the SFC more than once. So I hope that the following informations will help to answer your question: The parameter "RECORD" is a so called ANY-Pointer. You type P#DB10.DBX20.0. I am missing the length of the Buffer. Such as WORD 10. The data from the Slave will be copied one by one to the buffer. So the first Word into DBW20, the Second into DBW22 and so on. If you don't get data from your Slave, please check the "RET_VAL" of the SFC. Sorry if I told you informations you already know [:blush:] Best regards Sabine

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1/17/2006 5:52 PM	Rate (0)
neo Posts: 264 Rating: (59)	Hello mammeet, · You have to search for this information where the frequency will be stored in The documentation of the danfoss device. · PPO type 5 sets the standard fort he length of the information you will be able to receive from the drive device. · Normally you will get one or more status words from the drive. The allocation of the bits in this status word and description for should also be in the documentation of the drive device. · In the PLC you will find word 0 starting in db10.dbw20, word 1 in db10.dbw22 and so on. · I´m (like sabine) also missing the information about the length you want to receive with sfc14 with the any pointer Hope this helps you Best regards
neo Posts: 264 Rating: (59)
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1/18/2006 10:56 AM	Rate (0)
manmeet Gold Member Joined: 1/3/2006 Last visit: 2/19/2024 Posts: 726 Rating: (71)	hi there Hulzhex and Neo Actually DB10.DBX20.0 in SFC 14 automatically takes the length of 20 Bytes. I have an idea , but i want to get it confirmed. Hvae a nice day regards Manmeet

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1/18/2006 4:08 PM	Rate (1)
Shamsher Posts: 102 Rating: (3)	Hai All I have tried profibus communication in between S7 cpu's and siemens drives. All you have to do in siemens case is that for getting the cyclic data you simply use the load and transfer commands. Say the PIW addess of the drives as specified in the hardware configuration starts from say 520 and ends up at 529 then all you have to do is create a db say DB10. Leave the word address DB10.DBW0 as free. use the following programm L PIW520 T DB10.DBW2 L PIW522 T DB10.DBW4 . . . L PIW528 T DB10.DBW10 Apart fromthis you will have to parameterise the drive to send the data that you need to access. Use of SFC14 and SFC15 is advisable only if you need to reciebve and transmit acyclic data
Shamsher Posts: 102 Rating: (3)
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1/23/2006 2:11 AM	Rate (0)
RaGud Posts: 46 Rating: (1)	Hi all, I have just been working on a project which included interfacing 314C-2DP's with Danfoss VLT6000 drives, via Profibus. At first I considered the SFC's, and I can tell you that by far the quickest way is to use the PIW/PQW allocated to the drive in the PLC process image. Let me know if you want me go into more details.... RaGud.
RaGud Posts: 46 Rating: (1)
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1/24/2006 2:20 PM	Rate (0)
manmeet Gold Member Joined: 1/3/2006 Last visit: 2/19/2024 Posts: 726 Rating: (71)	hi there RaGud you said that you have quickest way is to use the PIW/PQW allocated to the drive in the PLC process image,for VLT 6000. Please let us know what is that? Regards Manmeet

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1/26/2006 11:34 AM	Rate (0)
RaGud Posts: 46 Rating: (1)	Hi manmeet, I assume you have installed the .gsd and setup the VLT in the HW config. When you insert an I/O module into the VLT slave (in the HW config) the VLT is allocated I/O addresses. You write to the output addresses the commands,setpoint frequency and VLT registers to read back, and Control Word. And you receive the response from the VLT on the corresponding input addresses (such as actual frequency, VLT register, Status Word, etc.). I.e. it as simple as reading/writing to normal I/O. Saying that,it's all but simple to understand the Danfoss Profibus manual! I havn't got one with me at the moment so I can't give you an example. But, let me know if you run into moreproblems and I'll get hold of the manual and try to get into more detail. I was going to include a snapshot of my HW Config for info, but once again attachements don't work on this web site. If you want I can send you the snapshot via e-mail - just let me know. Hope this helps, good luck! RaGud
RaGud Posts: 46 Rating: (1)	Last edited by: RaGud at: 1/26/2006 11:35 AM
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4/11/2006 4:11 PM	Rate (0)
Smurf Silver Member Joined: 9/28/2005 Last visit: 10/24/2024 Posts: 414 Rating: (28)	Hi, You can find the Danfoss Manual here: http://mcliterature.danfoss.com/WebPublish/main.do;jsessionid=G71vp1y1g5GnxQvyjbX5Mhnyl5WTZvGzV5QBrSGT4lTZ8R9qzXzL!210266483?series=VLT+5000 If you look at the option Profibus you will see an application description about a VLT5000 and a S7-315-2DP. Regards,
	Smurf "The only difference between a problem and a solution is that people understand the solution."
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7/10/2006 1:23 AM	Rate (0)
Siemen-Stains Posts: 101 Rating: (0)	It doesnt matter which PPO you use, the first word is always STAT/CTRL word and the second word is the MAV/MRV (Mainreference value, speed reference from drive) (Mainactual value, speed sent to drive) 27500=100% So what ever way you map it to DB,s consider the first DBW as STAT/CTRL and second MAV/MRV. Its STAT/MRV as PIW (data from drive) and CTRL/MAV as PQW (data to drive)
Siemen-Stains Posts: 101 Rating: (0)
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