PLANT OPERATION AND MAINTENANCE SUPPORTING DEVICE

PROBLEM TO BE SOLVED: To realize highly precise and efficient control integrating the operation support and maintenance time support, by mutually connecting a communication means, a central maintenance supporting device, an operation supporting device, a machine-side terminal equipment and a portable terminal equipment, and retrieving information on the central maintenance supporting device or the operation supporting device on the machine-side or on the site via the communi cation means. SOLUTION: Maintenance data of a site portable terminal equipment 10 is sent to a communication control means 24 provided with a machine-side base station 24A through radio LAN 10A and it is taken into the data input display control means 33 of the operation supporting device 30 through cable LAN 20A with operation support data of the machine-side terminal equipment 20. An operation support part 37, a diagnosis part 38 and a maintenance supporting part 39 support/diagnose the prescribed operation and generate maintenance supporting data while data is compared with drawing data and maintenance data of a plant, which are stored in a storage means 36. Prescribed input data is added and is sent to the machine-side terminal equipment 20 or the site portable terminal equipment 10 through cable LAN 20A.