Patent ID: 9208037
Filing Date: 2015-12-08
Classification: G06F

Abstract:
1. A duplexed operation processor control system, comprising: a pair of operation processors, an I/O device coupled to a control target, a first communication path that couples the operation processors to the I/O device, and a second communication path that couples the operation processors with each other, and wherein one of the operation processors is a primary operation processor which is in an active state for executing control operations for the control target and the other of the operation processors is a secondary operation processor which is in a standby state, wherein each of the operation processors is capable of switching between operating as the primary operation processor and the secondary operation processor, wherein each time data is transmitted between the primary operation processor and the control target via the first communication path, the secondary operation processor acquires the data contemporaneously with the transmission via a branched signal line that connects the I/O device to both the primary and secondary operation processors and performs a same operation as an operation performed by the primary operation processor based on the acquired data, wherein a phase of a second control cycle time of the secondary operation processor is advanced relative to a phase of a first control cycle time of the primary operation processor, and wherein the secondary operation processor is triggered to start the second control cycle time thereof, in response to a synchronous request frame sent from the primary operation processor to the secondary operation processor, and the primary operation processor is triggered to start the first control cycle time thereof, in response to a synchronous acknowledge frame output from the secondary operation processor to the primary operation processor as a response to the synchronous request frame.