EASY4 MODBUS RTU write Singel coil example needed

[AlesH]

Hi, I'm straggling with Modbus RTU. I have set all communication data between Master and slave but I don't understand a logic of writing of a single coil and MU acyclic request module. How I need to write a program.
I'm asking Eaton or other forum expert to provide me an example.

Thank you in advance Ales

[w.sprungmann]

hallo,
please upload the project

[AlesH]

hallo,
please upload the project

Hi w.sprungmann,

please find attached the project

[radar17892]

The Modbus register table is required for correct addressing.
See example image below.

[AlesH]

Hi radar17892,
I have try it but doesn't work

[radar17892]

Hello Ales,
I've taken a look at your project and I think you don't need a MU block. You're already writing Q33 cyclically (100ms) to Slave 1.
It makes no sense to use an acyclic MU block in the program if it is triggered cyclically.
Can you post a picture of the slave Modbus registers?
Please highlight the variables you want to communicate with slave 1.


Thomas

[Konni66]

Hello all!
I did not have a look onto the entire program...
Only one question: Are you sure you can write a coil?
Not all systems allow to write coils for security reasons. Because if you do so, the automation program loses control on coils.
Just an idea.

Geetz konni