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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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12/3/2012 4:24 PM	Rate (1)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 3/23/2023 Posts: 13203 Rating: (2147)	SIR 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. So if you have TIA Portal Pro V11, you can open the step 7 5.5 project, then add the s7-1200 plc and integrate into the existing profinet network, and the get/put blocks work as expected. That is good news for those with TIA Portal Pro! I wonder how to emulate that behavior with just TIA Portal Basic.
	science guy
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12/3/2012 4:45 PM	Rate (0)
SIR Experienced Member Joined: 2/2/2007 Last visit: 3/20/2023 Posts: 54 Rating: (4)	I did not change anything in STEP 7 project nor did I reload it. For this project it was like 1200 PLC did not exist! When I opened the STEP 7 project with TIA Portal the 1200 PLC was connected to the same network and it was enough to configure its connections and make the three 300 PLCs accessible. As 1200 is the active part in this connection GET and PUT blocks worked. I have not tried to make 300 PLC an active part of the connection by reloading the network configuration, which includes 1200, from TIA Portal so I don’t know if it would work. It might be much more complicated. Best Regards, SIR

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12/4/2012 3:00 PM	Rate (0)
Ganes10 Platinum Member Joined: 8/31/2010 Last visit: 3/16/2023 Posts: 1498 Rating: (217)	huggy_d1 So if you have TIA Portal Pro V11, you can open the step 7 5.5 project, then add the s7-1200 plc and integrate into the existing profinet network, and the get/put blocks work as expected. That is good news for those with TIA Portal Pro! I wonder how to emulate that behavior with just TIA Portal Basic. Hello huggy_d1, Using STEP 7 Basic you can achieve it by creating a S7 connection with an unknown partner. Make use of the same local ID at the other end (typically in STEP 7 classic). This will do for a S7 communication between a S7-1200 and S7-300 which are engineered using STEP 7 Basic v11 and STEP 7 Classic.
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12/4/2012 4:12 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 3/23/2023 Posts: 13203 Rating: (2147)	Ganes10 huggy_d1 So if you have TIA Portal Pro V11, you can open the step 7 5.5 project, then add the s7-1200 plc and integrate into the existing profinet network, and the get/put blocks work as expected. That is good news for those with TIA Portal Pro! I wonder how to emulate that behavior with just TIA Portal Basic. Hello huggy_d1, Using STEP 7 Basic you can achieve it by creating a S7 connection with an unknown partner. Make use of the same local ID at the other end (typically in STEP 7 classic). This will do for a S7 communication between a S7-1200 and S7-300 which are engineered using STEP 7 Basic v11 and STEP 7 Classic. Do you have a screenshot of what this kind of configuration / connection would look like and where do you get the local ID? Can you 'sniff' the existing profinet network for this, or must you have that information? I'm thinking where someone needs to add to an existing network but does not have source code and configuration details.
	science guy
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12/4/2012 6:43 PM	Rate (1)
Ganes10 Platinum Member Joined: 8/31/2010 Last visit: 3/16/2023 Posts: 1498 Rating: (217)	huggy_d1 Do you have a screenshot of what this kind of configuration / connection would look like and where do you get the local ID? Can you 'sniff' the existing profinet network for this, or must you have that information? I'm thinking where someone needs to add to an existing network but does not have source code and configuration details. Hello huggy_d1, Enclosed is the screenshot for creating a S7 communication between S7-1200 and a unknown partner. I have created this using STEP 7 Professional whereas the same can be done using STEP 7 Basic also. Attachment E:\S7 Communication 1200 - unknown partner.JPG (2402 Downloads)
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This contribution was helpful to 1 thankful Users 0_Einstein

8/23/2013 11:02 PM	Rate (0)
Abis Advanced Member Joined: 7/20/2013 Last visit: 3/20/2023 Posts: 20 Rating: (1)	Hi my name is Pratheesh. I tried to follow the sample program, but i couldnt succeed, here i am attaching the screen shot of the network. i want to get DB1DBD12 from s7-300 PLC, Its a Dint value. i want to read some of the real values also from these PLC by using s7-1200. could you plese tell me the ID , ADDR_1 and RD_1 etc. i tried so many things but couldnt suceed. i am a bigginer in this field, kindly explain me in detail how can i obtain these data . Attachment PLC.jpg (1290 Downloads)

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10/5/2013 5:38 PM	Rate (0)
Marko80 Posts: 24 Rating: (0)	Hello Everyone, SIR, Is it possible that you could link some screens from hardware configuration TIA V11 and Step7 5.5? or sample backups? Thanks in adnavce Marko
Marko80 Posts: 24 Rating: (0)	Last edited by: Marko80 at: 10/5/2013 5:39 PM
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10/17/2013 8:11 PM	Rate (2)
SebOber Posts: 34 Rating: (3)	Abis Hi my name is Pratheesh. I tried to follow the sample program, but i couldnt succeed, here i am attaching the screen shot of the network. i want to get DB1DBD12 from s7-300 PLC, Its a Dint value. i want to read some of the real values also from these PLC by using s7-1200. could you plese tell me the ID , ADDR_1 and RD_1 etc. i tried so many things but couldnt suceed. i am a bigginer in this field, kindly explain me in detail how can i obtain these data . Hello Pratheesh Judging from the date of your post this reply may come a little late. But I also couldn't figure outhow the ID, ADDR_1 and RD_1 where programmed and where they came from. I've figured it out and hopefully can explain to your benefit or at least others benefit trying to get the same information. ID: When using multiple s7-1200's in TIA Basic and you insert the PUT or GET command into the LAD programming you need to go into "Properties -> Connection parameter" tab. Then under "Partner" you select the PLC you wish to communicate with. That will automatically fill in the ID parameter. ADDR_1: Example of the PUT command: In the original attached example in the beginning of this thread you'll notice a DB named "DB1" in PLC2. And in the programming block under "PLC1 ->Main" the ADDR_1 is "P#DB1.DBX0.0 Byte 2" to break this line of random letters of numbers downP# means "pointer to" then "DB1" addresses to DB1 of the connecting PLC, in this case, PLC2. "DBX0.0" is the start point of where to write the data. "Byte 2" is simply how long the data is to be written. Now we should all already know that there is 8 bits to a byte. And we are passing a data type of Word which is 16 bits long or 2 Bytes. It is imperative that we make sure our sending end and receiving end are set up to handle proper Byte size or else errors can occur. RD_1 / SD_1: In TIAV11 basic, one can simple drag and drop the data from the DB created in the sending/getting PLC. In example from the original attached example. Main of PLC1 has a DB called "DBRD" with two words in it WR_PLC2 and RD_PLC3. However, to break down what the SD_1 and RD_1 commands mean lets take a closer look: In the PUT command in the example under SD_1 we see "DBRD".WRPLC2 this simply means that we are looking into the DB "DBRD" and grabbing the value in word WRPLC2.
SebOber Posts: 34 Rating: (3)	Last edited by: SebOber at: 10/18/2013 10:38 PM -Edited for clarity and removed erroneous information as per the wisdom of huggy_d1
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10/17/2013 9:53 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 3/23/2023 Posts: 13203 Rating: (2147)	SebOberI am a little surprised you were able to get your GET/PUT to work if you followed your own advice exactly as written. In my experience, the P#DB#.DBX0.0 BYTE 2 or P#DB#.DBX0.0 WORD 1 are supposed to mean the same and mean a single 16-bit chunk of data is being passed. If P#DB#.DBX2.0 BYTE 4 is used, it means start at word 1 (2 bytes offset from beginning of DB) and pass the next 4 bytes or 32-bits or 2 16-bit words worth of data. By reading your explanation, you seem to have BYTE where WORD should be in at least a couple of places. Thanks for the helpful tips, just be careful of the terminology. It may be that TIA Portal works even if we tell it the wrong values for GET/PUT, but perhaps some day they will change it and close any loopholes that let us read further into a DB that we say we passed via a pointer.
	science guy
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10/18/2013 10:41 PM	Rate (0)
SebOber Posts: 34 Rating: (3)	Hey thanks huggy, I changed a few things in my previous post for clarity. Was a long day . My info should be correct now, just give me a PM if I missed anything so we don't have to needlessly enlarge this thread.
SebOber Posts: 34 Rating: (3)
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This contribution was helpful to 1 thankful Users 0_Einstein

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