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Sample program: S7 communication GET and PUT instructions

Created by: MrPaiva at: 1/19/2012 12:54 PM (45 Replies)

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1/19/2012 12:54 PM	Rate (5)
MrPaiva Silver Member Joined: 6/29/2010 Last visit: 10/27/2022 Posts: 112 Rating: (63)	Hello guys, Here is a sample program of S7 communication betweenthree S7 1200 CPUs (thePLC1 reading data from PLC3 and writing data in PLC2). Attachment S7 1200 GET_PUT.zip (7818 Downloads)
	Last edited by: MrPaiva at: 1/20/2012 4:23 PM Last edited by: MrPaiva at: 1/19/2012 8:13 PM
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This contribution was helpful to 15 thankful Users Denilson Pegaia Vippi MartijnD Ganes10 AmirAlwaled Nelliyan randy wiks LeandroSouza Andrés_Ariza 40084783 jankoslayer Towome gc137 Alex Mol Diniz_

6/26/2012 11:26 PM	Rate (0)
BradyB Posts: 1 Rating: (0)	Damaged file no longer functional it seems that if SEIMANS wanted to sell more of the S7 1200 unitsthey would have more sample files available
BradyB Posts: 1 Rating: (0)
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6/26/2012 11:33 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 3/31/2023 Posts: 13226 Rating: (2152)	BradyB Damaged file no longer functional it seems that if SEIMANS wanted to sell more of the S7 1200 unitsthey would have more sample files available I just downloaded the file and it seems ok for me. I am not saying I do not agree there could be more 'reference projects'. I agree there could be more reference projects and examples within the online documentation in the portal showing several ways to use each instruction for normal and expected usage of those instructions. Very powerful to be able to copy right from the help file into the editor like you can for computer programming projects.
	science guy
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8/29/2012 4:16 AM	Rate (0)
Jacky444 Posts: 3 Rating: (0)	hello, Just download the file and had some doubt with the addr_1. the command that was key in was P#DB1.DBX0.0 BYTE 2 . Now DB1 is referring to which db that is meant for read/write and byte 2 refering the number of data to read but what does dbx0.0 refer?
Jacky444 Posts: 3 Rating: (0)
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8/29/2012 3:19 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 3/31/2023 Posts: 13226 Rating: (2152)	Jacky444 hello, Just download the file and had some doubt with the addr_1. the command that was key in was P#DB1.DBX0.0 BYTE 2 . Now DB1 is referring to which db that is meant for read/write and byte 2 refering the number of data to read but what does dbx0.0 refer? DBX0.0 in that context, namely, P#DB1.DBX0.0 BYTE 2, means start in DB1 at byte 0, bit 0, or the beginning of the DB. The DBX0.0 is common in pointers like this.
	science guy
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8/30/2012 5:01 AM	Rate (0)
Jacky444 Posts: 3 Rating: (0)	PLC 2 and PLC 3 its data type is 'word' and PLC1 is reading/writing the address of PLC 2 and 3 as 'byte'. won't it be a problem/conflict? if there no problem does it mean say i one to read/write PLC 2 or 3 with different data type, i just make sure the address i am refering is correct?
Jacky444 Posts: 3 Rating: (0)
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10/3/2012 8:33 PM	Rate (0)
MrPaiva Silver Member Joined: 6/29/2010 Last visit: 10/27/2022 Posts: 112 Rating: (63)	Hello Jacky444, The syntax "P#DB1.DBX0.0 BYTE 2" is a pointer, with this syntax we are accessing the 2 first bytes of the DB1, and these bytes were declared as a word. The "BYTE" of the systax is a unit of data to be accessed, not the type of the data.

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This contribution was helpful to 1 thankful Users Josehermis

10/4/2012 12:06 PM	Rate (0)
Walid Elshazly Experienced Member Joined: 7/6/2009 Last visit: 6/1/2022 Posts: 100 Rating: (0)	Why I Can't Open this Project with Step 7 V11 Professional ?? When i try to open the message shown in IMG_1 Displayed , So I can't see any details Attachment IMG_1.jpg (1525 Downloads)
	Walid Elshazly
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10/9/2012 11:44 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 3/24/2023 Posts: 4180 Rating: (1332)	Hi, the sample project was made with STEP 7 Basic V11 SP1 update 2. You need a equal or superior versionto open it. I suggest you actualise your software to the current version SP2 upd4: Service Pack 2for STEP 7 V11: http://support.automation.siemens.com/BR/view/en/56750498 Service Pack 2for WinCC V11: http://support.automation.siemens.com/BR/view/en/56897511 Updatesfor STEP7 / WinCC SP2 (use the update 4l): http://support.automation.siemens.com/BR/view/en/58112582
	Denilson Pegaia Siemens Industry Sector Technical Support
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12/3/2012 11:08 AM	Rate (0)
SIR Experienced Member Joined: 2/2/2007 Last visit: 3/20/2023 Posts: 54 Rating: (4)	Hi folks, I had a Step 7 V5.5 project which included three 300 PLCs linked in a Profinet network. I need to connect one 1200 PLC (CPU 1212C) to the same network which had to exchange data with one of the 300 PLCs. It turned to be easy to do that. I opened the Step 7 project using TIA V11 SP1. The hardware and the network appeared normally but the software was inaccessible. Nevertheless it was possible to link the 1200 PLC in the same network. Then I wrote my software for the 1200 PLC, which included GET and PUT blocks, and loaded it. Then connected the 1200 PLC to the network with the three PLCs and it worked! No additional changes in Step 7 project were needed.

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