Hi plcwars Community! I’d love your help in planning future content! Please take a moment to fill out this quick form. Fill out the form here: forms.gle/BBsFx7XRf7wUVEda8 As a thank you, you’ll get a link at the end of the form to download my OPC UA Cheat Sheet - a useful guide for working with OPC UA in Python. Just complete the form, and the download link will be yours! I’m really proud of this OPC UA cheat sheet and excited to share it with you - creating these resources is something I genuinely enjoy! If you notice any mistakes or have suggestions, please let me know - your feedback helps me improve! Thanks for being part of the community!
I have a DB that I wish to read using this code I don't have a previous knowledge in programming in python (only PLC Programming languages) i only want to read data the DATABLOCK is composed of 31 elements all of them are booleen can tou help me please
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)
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!
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
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?
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.
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! ;)
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)
Hi plcwars Community!
I’d love your help in planning future content! Please take a moment to fill out this quick form.
Fill out the form here: forms.gle/BBsFx7XRf7wUVEda8
As a thank you, you’ll get a link at the end of the form to download my OPC UA Cheat Sheet - a useful guide for working with OPC UA in Python. Just complete the form, and the download link will be yours!
I’m really proud of this OPC UA cheat sheet and excited to share it with you - creating these resources is something I genuinely enjoy!
If you notice any mistakes or have suggestions, please let me know - your feedback helps me improve!
Thanks for being part of the community!
Thank you so much for this helpful video
Very helpful video. Good job!
do you have an example about db_write (string) ?
hi , how to get HMI active with Put/ Get . pls help
I have a DB that I wish to read using this code I don't have a previous knowledge in programming in python (only PLC Programming languages) i only want to read data the DATABLOCK is composed of 31 elements all of them are booleen can tou help me please
for more specific support requests please write on our discord channel, it is easier to communicate there.
Thank you very much for sharing details
Do you know how I can get firmware version or software version from the plc using snap7?
THANK YOU SO MUCH
does this work with a cpu ET200SP also ??
I do not know really, I do not have any experience with CPU ET200SP, but if it supports PUT/GET it might be possible
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)
Hello. Could you please tell me how to read M bit registers/addresses (Like M2.0). Thanks.
Hi Abhishek, please have a look at my new video: ua-cam.com/video/Eo8NyNE1bRY/v-deo.html
could I use this method to communicate with s71200 DC/DC/AC?
Hi Mahmoud, I believe you should be able to.
ı have connection refused error. how can ı solve it
Were you able to solve it, currently having the same problem
Hi.
What should I do to change real or int instead of bool ? could you help me ?
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!
tks Sir
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
can you do a video for larger data types such as intergers
Hi Maxwel, please have a look here, I hope it will be helpful.
ua-cam.com/video/Eo8NyNE1bRY/v-deo.html
Did you make vidéo Tuto again?
What do you mean by that? I did not do it again?
nice tuto!! did you think make a video with siemens logo 8.3 and snap7.?
thanks! unfortunately, I do not have access to the siemens logo
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?
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.
Thanks or the tutorial. Any Idea why I get the error 'function refused by CPU (unknown error)'? Thanks in advance :) :)
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! ;)
Thanks for the tutorial.
Can you please tell how to write string values?
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 :)
I acn tell you how to write string send me an email
hi sir
how i can contact you directly?
Hi Tin, you can contact me on this email: plcwarsyt@gmail.com
i can do it the same on s7 1200?
i can buy you on for the tuto
you can contact me here: plcwarsyt@gmail.com
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)
Hi, I believe that for the downloading plc program you need dedicated software which in this case will be TIA Portal.