In most cases, the touchscreen is connected to a PLC, which then connects to the inverter. However, the touchscreen can also connect directly to the inverter without going through the PLC, controlling the inverter’s start, stop, frequency change, etc.
Today, we will take the Wecon touchscreen controlling the Mitsubishi D series inverter as an example to explain.
The touchscreen controls the inverter using RS485-based communication. Traditional RS485 uses two wires, but Mitsubishi’s automation products generally use a four-wire system. Therefore, when communicating between the touchscreen and the inverter, four wires are used.
On the inverter side, relevant communication parameters need to be set, mainly baud rate, address, and parity.
It is important to note that Mitsubishi inverters do not default to the MODBUS RTU protocol and require setting parameter 549. The communication data must be consistent between the touchscreen and the inverter; otherwise, communication will fail.
On the touchscreen side, we add a MODBUS RTU slave.
The communication parameters between the inverter and the touchscreen must be consistent; otherwise, communication will not work.
For the inverter to operate, it must receive a start signal and a speed signal. Therefore, we need to configure the screen to send the start signal and speed signal to the inverter. The addresses for the start signal and speed signal can be found in the inverter manual.
Above are the relevant address descriptions from the inverter manual. We just need to implement the corresponding start, stop, and speed settings on the screen.
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