SLAVE,NETWORK SYSTEM,SLAVE PROCESSING METHOD,AND APPARATUS INFORMATION COLLECTION METHOD

摘要

A safety PLC which is a master is connected to a safety slave(2)via a safety network(3),thereby constituting a network system.The safety slave includes an apparatus information storage block(25)for storing individual information and state information on a safety apparatus to be connected.The individual information is fetched in advance and stored and the state information monitors state of the safety apparatus in operation and updates the storage content according to the monitoring result.This processing is performed by an MPU(23).Upon reception of a request from the safety PLC,information on the apparatus stored is transmitted.Thus,the safety PLC can collect not only the ordinary state of the slave but also the state of an apparatus for management.