Hello friends i have some questions about mb client block 

1- upon what should i choose mb client version as mentioned in the photo ?

- is there a way to show the topology of the modbus connectios?

- at the modbus rtu i send and receive in different time , should i do the same at modbus tcp ?

-What is the usage of mb master block ?

Hello fsoliman355

perhaps you find some useful information in this application example:

https://support.industry.siemens.com/cs/de/en/view/102020340

Bye Murof