JPS6446197A - Supervisory and controlling equipment - Google Patents

Abstract

PURPOSE:To limit the supervising range of respective master stations and to supervise only an arbitrary remote station by masking the receiving signal from a remote signal except the remote station set beforehand. CONSTITUTION:Respective output terminals of a station counter circuit 2 correspond to respective remote stations and the output is selected and thus, a supervising range is limited. For example, two remote stations are arbitrarily selected, an FF circuit 3 is drived only for plural remote stations sandwiched to two stations. By the pulse generated from a decoder 1, an output signal is successively obtained from respective output terminals. The circuit 3 is set by a first selected station corresponding output signal, and reset by a final station corresponding output signal. The output of the circuit 3 is inputted through a polling selecting switch 5 to one side input terminal of a gate circuit 4. For this reason, the circuit 4 allows only the receiving signal of the remote station sandwiched to two remote stations to be passed. Consequently, a rear step logic circuit goes to be effective only for the stations. A gate composed of the switch 5 is provided and a mask function is stopped by the action.