Python Snap7 S7 Communication with PUT/GET with Siemens PLC TIA Portal

[@rezabizeh2084]

Thank you so much for this helpful video

[@chaukeoscar4295]

Very helpful video. Good job!

[@mustaphaelboukhari5124]

THANK YOU SO MUCH

[@kathirangamuthu3574]

Thank you very much for sharing details

[@vanbinh1221]

tks Sir

[@rezazaimzadeh4276]

Hello. Very good video but I couldn't connect with plcsim (cpu 1200). If possible, post a video about transferring webcam video (if there is such a thing) to hmi in TIA or wincc and connecting it to s7-1200. Thank you

[@NattapasPhongthananikorn]

do you have an example about db_write (string) ?

[@user-oq2fp6hx6q]

nice tuto!! did you think make a video with siemens logo 8.3 and snap7.?

[@plcwars]

thanks! unfortunately, I do not have access to the siemens logo

[@sigmadews5403]

Thank you for this tutorial. Can you describe the difference between snap7 and OPC UA when connecting to Siemens PLC? Is snap7 for Siemens something like ADS protocol for Beckhoff PLCs?

[@plcwars]

Hi! Thanks for your feedback. OPC UA is industrial standard for data exchange. (en.wikipedia.org/wiki/OPC_Unified_Architecture)
Snap7 is something to interface directly with the S7 communication protocol which Siemens uses in theirs PLCs. (snap7.sourceforge.net/)
I am not familiar with Beckhoff and ADS so I am not able to compare it and tell you if it is something similar.

[@cvg4057]

Hi, Could you please let me know if it is possible to use Snap7 for updating PLC program (I have existing program running on PLC. I have made some changes to it on another machine and i created archive of the project in another machine. Now i want to upload the archive project to PLC, is this possible using Snap7 library)

[@MacTeslucas]

Do you know how I can get firmware version or software version from the plc using snap7?

[@pravinshinde640]

Thanks for the tutorial.
Can you please tell how to write string values?

[@radoslavklein662]

def WriteMemoryChar(start_address, length, value):
writing = plc.mb_write(start_address, length, bytearray(value.encode('utf-8')))
print(writing)
print('Start Address: ' + str(start_address) + ' Value: ' + value)
............
charlength = 10
chars = 'HelloWorld'
ChartStartAddress = 104
for i in range(charlength):
char = chars[i]
WriteMemoryChar(ChartStartAddress + i, 1, char)
...............
In TIAPortal create smt function for moving CHARs from memory to STRING in DB..
...............
Youre welcome :)

[@obatochukwu2675]

I acn tell you how to write string send me an email

[@thatguyfromravenclaw]

Hello. Could you please tell me how to read M bit registers/addresses (Like M2.0). Thanks.

[@plcwars]

Hi Abhishek, please have a look at my new video: ruclips.net/video/Eo8NyNE1bRY/видео.html

[@ulyssesperezii]

Thanks or the tutorial. Any Idea why I get the error 'function refused by CPU (unknown error)'? Thanks in advance :) :)

[@plcwars]

Hi! thanks for your feedback!
There could be several reasons, did you check if "optimized block access" property is turned off? Is the PUT/GET enabled? Access level should be set to full. You can have a look in the following links for some more description.
stackoverflow.com/questions/47979438/s7-1200-snap7-exception-cli-function-refused-by-cpu-unknown-error
sourceforge.net/p/snap7/discussion/general/thread/c9ec5278/
I hope you will find your issue. Please let me know how it goes! ;)

[@maxwelmagoi]

can you do a video for larger data types such as intergers

[@plcwars]

Hi Maxwel, please have a look here, I hope it will be helpful.
ruclips.net/video/Eo8NyNE1bRY/видео.html

[@alierdemkurnaz9899]

Hi.
What should I do to change real or int instead of bool ? could you help me ?

[@plcwars]

Hi Ali,
You can take a look at this link: github.com/gijzelaerr/python-snap7/blob/master/example/write_multi.py
It is an example of reading and writing different types than boolean.
I hope it will be helpful. Let me know how did it go!

[@engineermahmoud4017]

could I use this method to communicate with s71200 DC/DC/AC?

[@plcwars]

Hi Mahmoud, I believe you should be able to.

[@dogukanurkmez2154]

ı have connection refused error. how can ı solve it

[@dabrosz9404]

Were you able to solve it, currently having the same problem

[@juniorberard9611]

Did you make vidéo Tuto again?

[@plcwars]

What do you mean by that? I did not do it again?

[@tinhuynh6582]

hi sir
how i can contact you directly?

[@plcwars]

Hi Tin, you can contact me on this email: [e-mail]

[@tinhuynh6582]

i can do it the same on s7 1200?

[@user-oq2fp6hx6q]

i can buy you on for the tuto

[@plcwars]

you can contact me here: [e-mail]

[@cvg4057]

Hi, Could you please let me know if it is possible to use Snap7 for updating PLC program (I have existing program running on PLC. I have made some changes to it on another machine and i created archive of the project in another machine. Now i want to upload the archive project to PLC, is this possible using Snap7 library)

[@plcwars]

Hi, I believe that for the downloading plc program you need dedicated software which in this case will be TIA Portal.