1. The touch screen controls the inverter through PLC
1. At present, the control 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 to start and stop, and monitor the operating frequency, current, voltage and other functions of the inverter.
2. The method of controlling the inverter through the PLC on the touch screen: connect the programming port of the PLC with the touch screen, and then expand a 485 interface on the PLC, and then the PLC and the inverter communicate through the 485. These two communications can communicate with each other 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. No PLC, touch screen directly controls the inverter
In order to make the inverter run, 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 through communication, so this problem boils down to the fact that the touch screen is the communication master 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 establish a MODBUS slave in the touch screen.
3. The communication port between the touch screen and the inverter
1. RS485 communication port of Delta inverter
2. The communication port of Weilun touch screen
3. Here we need to wire the touch screen and the RS485 terminal of the inverter.
Fourth, the touch screen and control the communication settings of the inverter
1. Set the operation instructions and frequency instructions of the inverter to use 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 format, 9600, E, 8, 1.
5. The touch screen directly controls the operation steps 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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4. Use Fault
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