| 摘要 |
PURPOSE:To hold a signal condition even if a signal cable has been drawn out carelessly, by operating a voltage monitoring relay provided on a relay panel in case when a signal path has been cut off, forming each self-holding circuit of a data relay, and holding a signal at its prestate. CONSTITUTION:An operation panel X, a relay panel Y and cables A, B for connecting these panels are provided. For instance, in case when the cable A or B has been drawn out, a circuit of a relay MX is opened due to its drawn-out width, but the voltage monitoring relay MX is returned earlier than data relays X1-Xn, therefore, the relays X1-Xn are held at a state before the signal cable is drawn out. After that, when the drawn-out signal cable A or B is returned to its normal state, the relay MX is operated again, a contact of an operating contact (mx) is switched, and a holding circuit of each relay X1-Xn is opened, but during this time, since the time tms exceeds the reset time tms of the relays X1-Xn, the state before the signal calbe is drawn out is held. |
