Distributed I/O control system, distributed I/O control method, and master station and slave station for distributed I/O control system

摘要

In a distributed I/O control system updating data through a network between a shared memory of a slave station performing input/output of data with plural input or output devices and a shared memory of the master station corresponding to the slave station's shared memory, the master station sets group information with respect to the input or output devices, and outputs, according to a cycle table, an input request frame specifying the shared memory in the slave station and the group information, and the slave station performs input/output of data with plural input or output devices, and determines whether an input request content specified by an input request frame from the master station is all information in the shared memory in the slave station, or information corresponding to the group information, to thereby transmit output data according to the input request content.