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Ethernet communication between an S7-1200 and PC

Created by: mrjorgen at: 5/30/2014 11:31 AM (9 Replies)

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5/30/2014 11:31 AM	Rate (0)
mrjorgen Regular Member Joined: 11/29/2011 Last visit: 12/5/2024 Posts: 11 Rating: (0)	Hi Ethernet communication between an S7-1200 and PC. I wonder if there's an easy way to send a file with about ten to twenty words, from the PC to the PLC. Some of them are integer and other text or bar code. Does anyone have an example of sending a file to the PLC? I have tried using TRCV and Tsend. So the communication between the systems work, but if you do not send the exact same number of characters that are configurable so it's not so good. Grateful for answers.

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This contribution was helpful to 1 thankful Users peter cech

5/30/2014 11:39 AM	Rate (0)
peter cech Posts: 51 Rating: (4)	what you want to send from PC to plc??? Communication problem or Data receiving problem???
peter cech Posts: 51 Rating: (4)	Last edited by: Tez013 at: 5/30/2014 11:40 AM
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5/30/2014 3:01 PM	Rate (0)
mrjorgen Regular Member Joined: 11/29/2011 Last visit: 12/5/2024 Posts: 11 Rating: (0)	Thanks for a quick reply. I want to send a table of information, it will generate a text file for each desired made profile. I will receive the files and upload them in a queue, which can later be produced. Sending an example, it to be transmitted is marked in yellow. Data available: Product Name: 171771717 Barcode: 123456789AB Height: 3500mm Hole 1: 700 mm Hole 2: 800 mm Hole 3: 1000 mm Hole 4: 1500 mm Hole 5: 2000 mm Hole 6: 2500 mm Holes 7: 3000 mm Big hole: 485mm

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5/30/2014 3:21 PM	Rate (0)
umencho Diamond Expert Joined: 3/21/2006 Last visit: 3/19/2025 Posts: 10239 Rating: (1183)	mrjorgen Hi Ethernet communication between an S7-1200 and PC. I wonder if there's an easy way to send a file with about ten to twenty words, from the PC to the PLC. Some of them are integer and other text or bar code. Does anyone have an example of sending a file to the PLC? I have tried using TRCV and Tsend. So the communication between the systems work, but if you do not send the exact same number of characters that are configurable so it's not so good. Grateful for answers. So, this will be an external application which will have a communication with S7-1200 CPU using that communication will send a bytes in a specific order which will be go in a specific words in S7-1200. There is no way to send a txt file.

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5/30/2014 3:54 PM	Rate (0)
mrjorgen Regular Member Joined: 11/29/2011 Last visit: 12/5/2024 Posts: 11 Rating: (0)	Yes it is an external application which generates the text files, and then the PC that sends. Ok then you have to send tex ten characters, and then, ten characters again until you have provided complete information. I thought you could send a long string of such semicolons separate words. And then save it in a DB.

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5/30/2014 6:48 PM	Rate (0)
Josh Elliott Posts: 204 Rating: (29)	Hi, No,it is not possible....you can't send a txt file to a 1200PLC....the better option is to take a HMI update those values manually or through SCADA system If it a scada system you need to scripting to send the values to Sql server and to get updated in scada.
Josh Elliott Posts: 204 Rating: (29)
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5/30/2014 7:24 PM	Rate (0)
umencho Diamond Expert Joined: 3/21/2006 Last visit: 3/19/2025 Posts: 10239 Rating: (1183)	Look let's clarify the communcation - there is no 10 characters after the next...You will send a package all in one. And because this package inside will have a strong order the CPU will recognize that order accordingly... Using a HMI will be covered with the same logic.So you don't need. Let's try to fibd you an example how the communication between application and Siemens CPU is working.

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This contribution was helpful to 1 thankful Users Josh Elliott

5/30/2014 9:02 PM	Rate (0)
Navnag Platinum Expert Joined: 11/21/2007 Last visit: 3/16/2025 Posts: 2326 Rating: (309)	UMENCHO mrjorgen Hi Ethernet communication between an S7-1200 and PC. I wonder if there's an easy way to send a file with about ten to twenty words, from the PC to the PLC. Some of them are integer and other text or bar code. Does anyone have an example of sending a file to the PLC? I have tried using TRCV and Tsend. So the communication between the systems work, but if you do not send the exact same number of characters that are configurable so it's not so good. Grateful for answers. So, this will be an external application which will have a communication with S7-1200 CPU using that communication will send a bytes in a specific order which will be go in a specific words in S7-1200. There is no way to send a txt file. Hello mrjorgen It is possible to exchange Text ( ASCII )strings with a S7-1200 with some amount of programming. We have been using several ( Actually Apprx 40 ) S7-1200 PLCs in different locations, which communicate with a Central Server running a C# application for a filling automation system. The S7-1200 PLCs communicate with the Central Server on TCP/IP through internet usingTCON/TSEND/TRECV blocks. The Server sends the Filling details using Tightly structured Text Strings which are received by the S7-1200 as Character Arrays and interpreted by the S7-1200 and using for extracting filling volue and other data. The Actual Filling details are again converted by the S7-1200 into a Tightly structured Character Array and transimtted to the Main Server. So, in short, it is possible to exchange Text ( ASCII ) data with S7-1200 but you will need TCP/IP communication and some amount of programming on the PC side. mrjorgen Yes it is an external application which generates the text files, and then the PC that sends. Ok then you have to send tex ten characters, and then, ten characters again until you have provided complete information. I thought you could send a long string of such semicolons separate words. And then save it in a DB. You should structre your text so that the data locations are fixed, for easy interpretation in S7-1200. Different fields can have a ';' as seperator . Start of every Msg should have an identifiable header preferably starting with '#' Hope this helps Cheers Navnag
	Last edited by: Navnag at: 5/30/2014 9:07 PM There is no such thing as the last bug in a program There are no stubborn bugs, There are only stubborn Debuggers.
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12/8/2014 4:07 AM	Rate (0)
subin Posts: 84 Rating: (20)	Hi, I too searching for the solution on this, I need to send the barcode id as string, gross and net weight as real values from PLC to a PC. The PC will have a LabWindows based exicutable application or basically to test with hyperterminal. I used the TSEND_C but i see it is able to send data successfully in char data type, if i send as string it add some unknown characters to the data and if i send a real value, it just send some unknown character without data. Is there any other solution which i can try to have a interface with Labwindows based application or any VB application.
subin Posts: 84 Rating: (20)
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12/10/2014 3:38 PM	Rate (0)
Fafner Silver Member Joined: 3/20/2013 Last visit: 3/24/2025 Posts: 676 Rating: (44)	Edit: For a S7-PLC: a char is one byte of data. a string starts with two bytes of data which are describing the maximum length of the string and the actual lengths. afterwards the PLC goes on with your characters...
	Last edited by: Fafner at: 12/10/2014 3:39 PM Best Regards, Fafner
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