The plug-in consists of two 32-bit microcontrollers, one of which is the protection chip CPU with on-chip operation to complete the analog acquisition, operation, comparison and logic opening and closing.

The other one is the management chip CPU, which communicates with the DSP through SPI high-speed synchronous serial port, with the peripheral smart on/off plug-in through CANBUS bus, and with the peripheral LCD module through asynchronous serial port.

The external memory FLASH and static RAM are driven through parallel bus, and the clock chip is communicated through the I2C bus on the board. Analog channel switching decoding external to the AC converter plug-in, the

The high speed bus communicates with the external plug-in, making the CPU plug-in simple and with high anti-interference capability, and easy to expand multiple plug-ins.

It is widely used in thermal and hydroelectric power plant substations, and all kinds of substations in power system.