GlobalModbus RTU Master Function Block
If you want to
Use the Modbus RTU protocol for communication with inverters when performing velocity control for packing machines where RS -485 serial communication is used to set and monitor inverters directly from the PLC.
These function blocks are designed to
Execute 5 types of Modbus RTU commands. Select function blocks to suit your application and set parameters.
* Scroll left and right to see.
| Modbus Function code | Command name | Function |
|---|---|---|
| 01 Hex | Read Coils | Read multiple coils |
| 03 Hex | Read Holding Registers | Read multiple holding registers |
| 05 Hex | Write Single Coil | Write a single coil |
| 06 Hex | Read Single Register | Write a single holding register |
| 10 Hex | Write Multiple Registers | Write multiple holding registers |
Previously the user had to create a ladder program to determine execution timing because the CP2E CPU Unit can send or receive Modbus RTU commands via a single port. These function blocks send or receive commands sequentially in the order the function blocks are turned ON, which eliminates the need for programming the timings.
OMRON Corporation