Multifunctional signal expansion device

The utility model discloses a multifunctional signal expansion device, relates to a signal expansion device, and aims to solve the problems that the type of input and output signals cannot be changedrandomly and the number of output channels cannot be changed randomly in the conventional signal expansion device. The processing circuit comprises a clock unit, a communication unit, a CPU and an isolation power supply. The clock signal output end of the clock unit is connected with the clock signal input end of the CPU, the CPU communicates with the outside through the communication unit, and the isolation power supply supplies power to the input conversion circuit, the CPU and the output conversion circuit; the signal output end of the input conversion circuit is connected with the signal input end of the CPU in a pluggable mode, and the N signal output ends of the CPU are connected with the signal input ends of the N output conversion circuits in a one-to-one pluggable mode. The utility model is suitable for e