MONITORING CONTROLLER

PURPOSE:To easily find an abnormal state by controlling a machine to be controlled, when constant mark sign transmitted from a main station for controlling the whole equipments of an electric station, to a subsidiary station for controlling each equipment, via a transmission line coincides with correct constant mark sign. CONSTITUTION:A parent station 1 is connected to a plurality of subsidiary stations 2 (one station is a figure) via a data transmitting circuit 3. The subsidiary station 2 is provided with a transmission controlling section 5, an arithmetic section 6, and an input/output section 7. By controlling output from the input/ output section 7, auxiliary relays 8-1 to 8-3 working with constant mark signal 5C2 or 3C2, equipment selecting auxiliary relays 9-1 to 9-n, and an auxiliary relay 10 for an ordinary closing poor device are driven. From the input/output section 7, by the constant mark sign 3C2, ON/OFF-control sign is transmitted to main machines 11-n. In the subsidiary station 2, the control output is conducted only when the combined patterns of the constant mark sign 5C2 are equal to each other, and the auxiliary relay 10 is turned OFF when the patterns are abnormal. As a result, a hardware error and a software error are easily detected, and the reliability of dispersed system is improved.