| 摘要 |
PURPOSE:To prevent the increase of a cost, the increase of a space and the deterioration of the reliability by connecting both the ends of the contact of a control relay to a pair of interlocking contacts provided in respective selection relays in a relay contact output device provided with the contact of the control relay for connecting or separating one end of the contact of the selection relay to or from the common of a grounding line or the like. CONSTITUTION:When a control signal for controlling the selection relay is inputted to a slave station from a master station, for instance, the selection relays 1a, 1b are turned on. When the contacts 1a, 1b of the selection relay are turned on, the control signal for controlling a control relay is outputted to the slave station from the master station and the control relay 5 is turned on. A current from a voltage source Vcc is conducted to a ground side through the relay 11, the contact 1a of the selection relay, the contact 5 of the control relay and the contact 1b of the selection relay to operate the relay 11 and a controlled equipment controlled by this relay 11. Thus, the common is separated, so that other contacts 1b-4b of the selection relay are used, therefore, it is not necessary to provide a new control relay for separating the common and the cost and the space are not increased.
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