3401 system is mainly to ensure that the leakage protection action time is less than 50ms and short-circuit protection action time is less than 100ms, so it is necessary to ensure that the CPU collection and processing operation speed is very fast, UniMAT PLC using high-frequency microprocessor, instruction processing speed than ordinary PLC to enhance 3-10 times, using UniMAT UN200 PLC collection and control cycle time is The acquisition and control cycle time of UniMAT UN200 PLC is 12ms, plus peripheral equipment time 30ms, a total of 42ms, which meets the standard requirements of the equipment.

3401 adopts text display, with UniMAT UN200 series small PLC, to achieve the working status of the feeder switch, parameters and fault type display and memory, and can be modified and adjusted to the specific parameters, friendly user interface, with good man-machine dialogue function, can greatly improve the efficiency of judging faults and troubleshooting.

3401 All analogue signals are processed as digital signals, featuring strong anti-interference ability, simple wiring, large amount of information, reliable and accurate control, etc. 3401　With complete self-test, self-diagnosis and fault simulation experiment function, it is convenient to check whether the protection and control system is normal or not.