Dual Controlling Method of Local Controller for An Automatic Control System and an Equipment thereof

摘要

The present invention relates to a controller redundancy control method of the field control device in the automatic control system and the device.;One field controller in charge of distributed control in automatic control system is composed of I / O devices consisting of several boards and controllers to control these I / O devices. The other controller operates in a standby state, and when a failure occurs, the controller performs active / standby switching to perform redundancy control to ensure continuity of the task being performed.;The present invention uses the two controllers having the same structure as the controller (controller), which plays the most important role in the field control device, to operate the active and standby (emergency standby), respectively, backing up the normal fluctuation data and the active controller. When a failure occurs, the standby controller immediately switches the active / standby state to perform the redundancy control that doubles the reliability by continuously executing the control program instead of the failure controller.