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SFC67 X_GET

Created by: PC4 at: 6/30/2009 12:15 AM (6 Replies)

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6/30/2009 12:15 AM	Rate (0)
PC4 Posts: 23 Rating: (0)	hi i'm wanting to share a real value between two seperate S7-300 315-2DP . I was going to use the MPI port to do this along with the X_GET SFC. Could someone help me out like what do i do to the CPU that i'm getting the data from how do i set that one up and how do i setup the cpu that i'm recieving the data to. MIke
PC4 Posts: 23 Rating: (0)
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6/30/2009 2:18 AM	Rate (0)
Safety1 Posts: 73 Rating: (20)	Hello PC4, X_GET and X_PUT can be used on the MPI port. The PLC requiring data from another PLC can simply run the X_GET. There is no programming on the other PLC. One of the parameters for X_Get VAR_ADDR which is the remote data address where you want to get data from. There is a very good example at http://support.automation.siemens.com/WW/view/en/747743 You will also find information on this in Step7. Go to START>SIMATIC>DOCUMENTATION> System Software for S7-300/400 System and Standard Functions. Chapter 22. You will also find example projects installed withStep7. Start Step7 select FILE>OPEN>SAMPLE PROJECTS>Select ZEn01_11_STEP7__Com_SFC1.
Safety1 Posts: 73 Rating: (20)
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This contribution was helpful to 1 thankful Users salah_90

6/30/2009 8:56 AM	Rate (0)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 11/6/2024 Posts: 4516 Rating: (839)	Hello, There's another simple method for establish a communication ebtween 2 CPUs via MPI. It's called Global Data Communication "GD-communication". Here's in this thread a lot of details on how you can implement the GD-communication. Also have a look on the following FAQs: Basic communication between CPUs with global data What properties, advantages and special features does the global data communication offer? Regard,
	Last edited by: Ayman Elotaify at: 6/30/2009 8:57 AM Ayman Elotaify
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7/1/2009 3:14 PM	Rate (0)
PC4 Posts: 23 Rating: (0)	i went ahead and did it similiar to the example. but i'm still able to get the information. i moved the real reading toa MD40.0 location on the cpu i want to get the information from. and then on the cpu that i want to recieve i set up like REQ - M30.0, CONT - M30.3, DEST_ID - W#16#4, VAR_ADDR - P#M 40.0 BYTE 5, RET_VAL - MW40, BUSY - M35.0, RE - P#M60.0 BYTE 5, and i do have the MPI address on the cpu that has the information is address 4. they are set up as two seperate programs. do they need to be in the same program and the cpu connected up in net pro? Mike
PC4 Posts: 23 Rating: (0)
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7/1/2009 8:44 PM	Rate (0)
jklm Platinum Member Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (309)	Hello, you could also declare one CPU315 as DP Master, and the second CPU315 as DP Slave. You can configure in the HWconfig the second CPU as intelligent slave I-slave (=configured station in HW config) of the firts CPU. And declare a range of bytes that are exchanged like I/O bytes between both systems. Here an example (where the Master is an S7-400, but the basic settings remain the same). http://support.automation.siemens.com/WW/view/en/6518822
	Best regards jklm Suggestion was helpful? Feel free to rate it.
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7/1/2009 8:55 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (999)	PC4 do they need to be in the same program and the cpu connected up in net pro? Mike No! But the MPI adress must be different form the adress of your PLC.
IBN-Service Posts: 8946 Rating: (999)
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7/17/2016 9:35 PM	Rate (0)
Leem Posts: 14 Rating: (0)	IBN-Service PC4 do they need to be in the same program and the cpu connected up in net pro? Mike No! But the MPI adress must be different form the adress of your PLC. I know this is an old thread, but I found it while looking for help on SFC67 X_GET Similar issue to the OP, I want to exchange data between 2 315-2 DP CPU's so tryin to use X_GET. I can't get it to read data from the other PLC. My PLC's are not in the same project, but they do have different MPI addresses. (PLC1=MPI2, PLC2=MPI3) As they are not in the same project, I'm wondering if this is why it isn't working? UPDATE: I got it working! I found another post on Siemens with a X_GET and X_PUT example. At the bottom of the post it mentioned about putting the CPU into stop before downloading to the PLC in order for it to run properly. I had already downloaded to the PLC so power cycled the machine and Hey Presto, it's working!
Leem Posts: 14 Rating: (0)	Last edited by: Leem at: 7/17/2016 10:20:34 PM
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