Patent ID: 11874646
Assignee: YOKOGAWA ELECTRIC CORPORATION
Field: Control (Instruments)
Classification: CPC G  H  Y | IPC G  H

Claim 0:
1. A control system comprising:
one or more field devices that performs at least one of acquisition of data for control of a plant and operation of the plant;
a first control apparatus, to which a first field device included among the one or more field devices is directly connected, comprising a first access route controller and a first control application capable of controlling the first field device;
at least one second control apparatus comprising a second access route controller and a second control application capable of controlling the first field device;
a cache server that includes a third access route controller and a memory storing input/output data for the one or more field devices; and
a network that communicatively connects the first control apparatus, the second control apparatus, and the cache server, wherein
the first access route controller is capable of transmitting input/output data for the first field device to the third access route controller;
the third access route controller is capable of storing the input/output data received from the first access route controller in the memory; and
the first access route controller, the second access route controller, and the third access route controller work together to control an input/output route from the first control application and the second control application to the first field device and are capable of transferring, to the cache server, an input/output instruction for the first field device from the second control application in accordance with a predetermined condition;
wherein the first access route controller, the second access route controller, and the third access route controller transfer, to the cache server, the input/output instruction for the first field device from the second control application when a load of the first control apparatus satisfies a predetermined condition;
wherein the first access route controller, the second access route controller, and the third access route controller transfer, to the cache server, the input/output instruction for the first field device from the second control application under a high load of the first control apparatus, so that the load of the first control apparatus is reduced.