How to control the inverter with a touch screen?

I  Touch screen controls the inverter through PLC

1. At present, the control of the inverter in general needs to use PLC to communicate with the inverter, read the information of the inverter, and then the touch screen communicates with the PLC to complete the control of the inverter start, stop, and monitor the operating frequency, current, voltage and other functions of the inverter.

2. The method of using the touch screen to control the inverter through PLC

Connect the touch screen to the programming port of the PLC, and then expand a 485 interface on the PLC, and then the PLC and the inverter communicate through 485. The two communications can communicate without affecting each other, and then write the corresponding program as needed to make the touch screen change the frequency of the inverter through the PLC.

II  Without PLC, the touch screen directly controls the inverter

In order to make the inverter run, there must be two conditions, namely the start signal and the frequency signal. Therefore, the essence of the touch screen controlling the inverter is to realize the start signal and frequency signal of the inverter on the touch screen. The touch screen and the inverter are connected through communication, so this problem comes down to the touch screen as the communication master station and the inverter as the slave station to establish a connection. The inverters all have RS485 interfaces and support the MODBUS protocol. Therefore, we only need to create a MODBUS slave station in the touch screen.

III  Operation steps for the touch screen to directly control the inverter

1. Make a communication line to connect the touch screen and the inverter

2. Set the communication parameters of the inverter

3. Set the communication parameters of the touch screen

4. Make the operation screen of the touch screen

5. Wiring and debugging of the master station to control the slave station