Control and monitoring signal transmission system

A control and monitoring signal transmission system comprising a master station that transmits and receives data to and from a control part, and a plurality of remote stations that transmit and receive data to and from the master station by a transmission synchronization method via a common transmission line, wherein:

• transmitting and receiving data between the master station and the remote stations is performed by superimposing data on a frame repeatedly transmitted from the master station,
• the frame is time divided, control and monitoring data range wherein the transmission direction of the data is determined and allocated to each of the remote stations is provided, management data range for use in data transfer with all of the remote stations is provided separately from the control and monitoring data range,
• numerical value as an address for obtaining the timing of the data range allocated to the own station in the control and monitoring data range is set for each of the remote stations,
• the master station transmits a comparison identifier using the management data range at timing when a process for recognizing the address is executed,
• the remote station enables data transfer using the control and monitoring data range when receiving the comparison identifier, stores the comparison identifier, and when the operation identifier is transmitted from the master station, the remote station enables or disables data transfer using the control and monitoring data range basing on a result of comparison between the operation identifier and the comparison identifier.