Patent ID: 8054850

Claim:
A communication control system for causing a communication station performing communication in accordance with a standard protocol to perform multiplex communication based on time division of a communication band, the communication control system controls a plant operation and comprises: a time slot assignment section which divides a communication cycle as a basic cycle of time division into time slots, and assigns a set of communication stations and a type of a communication section to each of the time slots; and a time-division multiplex communication section which performs communication within a period of the time slot in accordance with the set of communication stations and type of communication section assigned by the time slot assignment section, wherein each communication station is equipped with a timer section and a time-synchronous communication section, the type of the communication section includes time-synchronous communication, non-cycle data communication, and cycle data communication, the time-synchronous communication section performs time-synchronous communication by using the time slot in which the time-synchronous communication is assigned, when the time-synchronous communication section transmits a time-synchronous communication frame to each communication station, time of the timer section of each communication station and the time slots of all communication stations are synchronized, said communication control system controls communications in an industrial application, wherein said communication control system controls communications in a control bus connecting an operation monitoring apparatus and a controller, said operation monitoring apparatus operates and monitors a plant, and said controller controls the plant under the monitoring of said operation monitoring apparatus.