How Can I Use Function Code 03 When Using Modbus I/O?

Updated Dec 4, 2019


If you want to use function code 03, you have to make bound variables number with 400001~465535. Registers areĀ 

In Modbus protocol, function code 03 is 'Read holding registers'. in order to do that, you can simply read the bound shared variable.

For example, if you want to useĀ