1. The touch screen is controlled by PLC inverter
1. At present, the general control of the inverter needs to choose 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 to start, stop, and monitor the operating frequency, current, voltage and other functions of the inverter.
2. The touch screen is controlled by PLC: the touch screen is connected to the programming port of the PLC, and then a 485 interface is extended on the PLC, and then the PLC and the inverter communicate through 485. These two communications can communicate without affecting each other, and then write the corresponding program according to the need, so that the touch screen can change the frequency of the inverter through the PLC.
2. Without PLC, the touch screen directly controls the inverter
In order to make the inverter work, there must be two conditions, that is, the starting signal and the frequency signal, so the essence of the touch screen control inverter is to realize the starting signal and frequency signal of the inverter on the touch screen.
The touch screen and the inverter are connected by communication, so this problem boils down to the fact that the touch screen is the main communication station, and the inverter is the slave station to establish the connection.
The inverter is equipped with RS485 interface, which supports the MODBUS protocol, therefore, we only need to set up a MODBUS slave station in the touch screen.
3. The communication settings of the touch screen and the control inverter
1. Set the operation instruction and frequency command of the inverter to select MODBUS communication, set the communication address to 1, the communication baud rate 9600, and the data verification setting (E, 8, 1) even check forRTU.
2. Set the communication parameters of the touch screen to: MODBUS RTU pattern, 9600, E, 8, 1.
Fourth, the touch screen directly controls the operation process of the inverter
1. Make a communication line, connect the touch screen and the inverter
2. The communication parameters of the inverter are set
3. Communication parameter setting of touch screen
4. Make the operation screen of the touch screen
5. The master controls the wiring and debugging of the slave station
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