Method and system for improving reliability of control signal of control device

The invention relates to the technical field of industrial automation control, and provides a method and system for improving the reliability of a control signal of a control device, and the method comprises the steps: carrying out the self-inspection calculation of each control unit, and transmitting a self-inspection result message on a high-speed bus; each control unit sends mutual inspection messages to each other through the mutual inspection bus, performs mutual inspection calculation, and sends mutual inspection result messages to other control units on the high-speed bus; each processing unit receives all the control communication messages, all the self-inspection result messages and all the mutual inspection result messages and judges whether the control units and the control communication messages sent by the control units are normal and effective or not according to the control communication messages, the self-inspection result messages and the mutual inspection result messages; and extracting a co