Abstract: A dual CPU inverter system includes a power module and a control module electrically connected to each other and each having a CPU, a RAM and a ROM. After power on, the two modules can read the respective ROM data to the respective RAM to speed up the ready state. When external IO intends to store command parameters, the dual CPU inverter system can judge which module is the destination for the command parameter and send the command parameter to the ROM respectively. Therefore, the communication load between the two modules can be reduced.

Abstract: An inverter apparatus is incorporated with a built-in programmable logic-controller (PLC). The PLC includes internal memory for directly outputting control signal to provide inverter operation control without time delay and noise. The inverter apparatus includes external terminals for function assignment and an external program can be coded for expanding the function of the inverter apparatus through the external terminals. The inverter apparatus of the present invention can overcome the problems of limited function and complicated wiring.