| 主权项 |
1. A transmission line address overlap detection system in a control/monitoring-signal transmission system in which
a single main station and a plurality of substations are connected to each other with a common data signal line, under control of a transmission clock generated by a timing generation unit included in the main station, the main station outputs a series of pulsed signals to the common data signal line as a control data signal according to a value of control data sent from a control unit, extracts a data value of a monitoring data signal, superimposed on the series of pulsed signals for each cycle of the clock from each of the substations, and sends the extracted data value to the control unit, and each of the substations counts pulses of the series of pulsed signals starting from a start signal indicating start of the series of pulsed signals, extracts the control data corresponding to its own substation from the series of pulsed signals when the count value matches an address of its own substation, and superimposes the monitoring data signal on the series of pulsed signals in the same pulse cycle as a clock in which the control data corresponding to its own substation are extracted, wherein: a management data area including a plurality of pulsed signals is provided in the series of pulsed signals, the management data area being different from a control/monitoring data area including data of the control data signal and data of the monitoring data signal; the substation sets random number data generated by its own substation as an original number, generates a plurality of pieces of comparison/collation data including data of a plurality of bits based on the original number, and superimposes a signal including the pieces of comparison/collation data on the management data area; and the main station determines existence or non-existence of address overlap in the substations based on a result of comparing the pieces of comparison/collation data in compliance with a predetermined rule. |
