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

摘要

The shared memory of the slave station that inputs / outputs data to / from multiple input devices or output devices and the shared memory of the master station that corresponds to the shared memory of the slave station are communicated via the network and updated. In the distributed I / O control system, the master station sets group information for the input device or output device, and outputs an input request frame in which the shared memory of the slave station and the group information are defined according to the periodic table. The slave station inputs / outputs data to / from multiple input devices or output devices, and the input request content of the input request frame from the master station is all the information in the shared memory of one or more units of the slave station or group information The output data is transferred according to the input request contents.