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Interroll controller refers to a master command device that controls the starting, speed regulation, braking, and reversing of an electric motor by changing the wiring of the main circuit or control circuit and changing the resistance value in the circuit according to a predetermined sequence. It consists of a program counter, instruction register, instruction decoder, timing generator, and operation controller. It is the "decision-making mechanism" for issuing commands, i.e., it coordinates and directs the operation of the entire computer system. Controllers are divided into combinational logic controllers and microprogrammed controllers, each with its own advantages and disadvantages. Combinational logic controllers are troublesome to design and have a complex structure.