Excellent video, thank you for sharing as I have been tearing my hair out trying to establish 485 comms. Did you address the only issue I can see that is if one of the 5 nodes fails? Huge thanks again and great work!
Hello! If one node fails will that bring the system to a standstill? Do you have a work around for this? I am considering using his code but what you said concerns me. thanks!
An Error instruction parallel to Done instruction for request is there. If one node fails it will give an error which will cause the routine to jump to the next slave.
Thanks for the video, the missing node not necessary generates an error, therefore some workaround is required for that. I have noticed on our system. We are testing 24 nodes and the nodes from 2 to 23 are not fitted yet, therefore we had to find a way to workaround that. Thanks.
i followed you step by step but did not work when i set connect in the slave there is no response !! how to fix that ?
6 лет назад
hi sir! I am a student i connected Modbus RTU with inverter ABB acs550, But some time cycle time for inverter run and stop have problem.I watch your video, but i can't understand. Please help me.
Hi thanks for the guidens, :) I have done as it was done on the video, and the other one befor that. But my modbus master never reaches being "Done". "MBCONFIG.DONE" is never true, it shuffles from 1 to 5 in "MBCONFIG.MB_ADDR. what could be wrong ?
And what is the password for "How do you establish a MODBUS-RTU communication with STEP 7.rar"? Password: "like share and subscribe video" - Does not fit.
The problem that was happening in your case i.e 1st slave data being moved to next 2 nd slave. Am also facing same issue. I have gone through the bkp u sent. But same problem am facing so please help.
Bác cho em hỏi chút. Ví dụ em truyền thông với con MFM383A với địa chỉ volte12 của nó là 30008 thì chỗ DATA_ADDR của MB_config read thì điên bao nhiêu . Mong sự giúp đỡ của bác.
Thanks a lot for sharing this video. i have a question regarding slave device address does not continues like example 40000-400013 40015-40022 40200. Could you please advice how to edit on your tutorial.
Thank you so much for the video! It helped a lot to understanding the process. But I'dlike to see your project. Could you tell the password for the archive?
En que puede influir el ya no leer 3 o 5 sino en este caso 35 bloques mb_slave tengo una aplicacion con estos 35 mb_slave pero el scan y la respuesta del cambio de los datos que leo es muy lenta como puedo mejorar eso estoy usando un plc 1500
What happens if you have only one slave working and the others are off or one OFF. The busy signal are ON every time. How can you solve this; how to bypass this problem?
@@kme8134 inside the Modbus_Comm_Load Block you will find parameter called RESP_TO which responsible for Response timeout and has the below details: 5 ms to 65535 ms - Time in milliseconds that Modbus_Master waits for a response from the slave. If the slave does not respond within this period, Modbus_Master repeats the request or terminates the request with an error if the specified number of repetitions (see below, RETRIES parameter) has been sent.
Mình dùng dùng cổng USB convert RS422/485 để kết nối vs CM1241, rồi dùng app Modbus Slave như bạn nhưng mình chỉ Write được vô Modbus Slave chứ không Read được, mình đã kiểm tra kĩ code với các thông số cơ bản, bạn có biết tại sao không ? Cám ơn !
Thank you so much for your tutorial. It helped me a lot to understand how the modbus Repository in TIA works. Im trying also to read and write simultaneously. Could you please send my the password for your TIA example "....rar"? Thx a lot again!
