Abstract: A control/supervisory signal transmission/reception system includes a central station and a number of local stations which are interconnected by a common data line carrying a three-level voltage signal so as to transfer data signals between the central and local stations. Information concerning structures and functions of the local stations is grasped automatically by using frames having ID codes differing from one to another frame, whereby the central station can check occurrence of breakage of the transmission line or shut-down of the local station inclusive of the units to be controlled/supervised associated with the local station. The frame includes a start signal field, a data signal field, a local station ID code field and an end signal field. In the local station, an ID code allocated thereto and a count value indicating data reception/transmission address are preset.

Abstract: A sensor signal transmission system for transmitting serially sensor signals produced in parallel by a plurality of sensors installed at a remote station to a central control station. The central control station includes a clock generating circuit, a signal conversion circuit for converting a voltage of a power supply source into clock-pulse superposed voltage signal, a start signal generating circuit, and a data extracting/converting circuit for detecting levels of an input signal to the central control station at the timing of the clock signal. The local station is connected to the central control station and signal includes a power generating circuit for generating a source voltage required for electrical energization of the sensors by smoothing the pulse superposed voltage signal. The clock pulses are modulated by the sensor state signals, which modulation is detected by the data extracting/converting circuit of the central station for evaluation or other processing thereof.

Abstract: A bidirectional control/supervisory system for transmitting control signals from a controller to devices and transmitting supervisory signals from sensors monitoring the devices to the controller through a common transmission line. A transmission/reception control circuit generates a timing signal and a supply voltage of constant level, and converts the voltage into clock pulses having voltage levels differing from the supply voltage. The clock pulses are outputted to the common transmission line under the timing of the timing signals.

Abstract: A remote control system comprises a central control station and at least one local station installed remotely from the central control station and connected thereto through a power transmission line. The local station has a plurality to devices connected in parallel to one another at the output. The power for actuating the devices is supplied from the central control station. For controlling actuation of the devices, binary control signals are serially sent from the central control station to the local station through the power transmission line in synchronism with clock pulses in a train including a start pulse. In the local station, the binary control signal are extracted in response to the start signal and converted into parallel control signals by utilizing the clock pulses to be applied to output circuits provided for controlling the devices.

Abstract: A solenoid controlled valve of the double pilot type includes a valve main body having a valve mechanism, a pair of pilot valve units each being secured to respective sides of the valve main body and having solenoids for driving the valve mechanism of the valve main body, to first and second sets of male terminals connected to the solenoids, a wiring box being secured to a lower surface of an assembly of the valve main body and the pilot valve units, third and fourth sets of female terminals receiving the first and second sets of male terminals, respectively, a fifth set of male terminals connected to the third and fourth sets of terminals via electric wires, and a base secured to a lower surface of the wiring box at its center. The wiring box has formed therein conduits which are communicated with conduits formed in the valve main body and the base.

Abstract: An apparatus for controlling a plurality of electromagnetic valves of manifold type including a parallel-in/serial-out unit for convert parallel control signals for a plurality of electromagnetic valves into a serial control signal and generating a composite control signal including the serial data signal, a start synchronous signal synchronized with the serial data signal and a driving voltage, a synchronous signal receiving circuit arranged on a manifold for generating a start signal in response to the control start synchronous signal supplied from the parallel-in/serial-out unit, a plurality of driver circuits each arranged on respective electromagnetic valves, a first driver circuit receiving said start signal supplied from said synchronous signal receiving circuit to convert the serial control signal into parallel control signals for driving the relevant electromagnetic valves and after driving the electromagnetic valves, said driver circuit producing an end signal, a synchronous signal transmitting circ

Abstract: A programmable controller connected for receiving the external numerical data from a date setter to the central control unit. Data sets in a numerical data setter can be used as the time data in a timer instruction and count data in a counter instruction when the prescribed code is used and the user program is executed.

Abstract: A sequence controller for parallel and other operations by way of mutual interlocking with other controllers is disclosed having flags which may be set and reset not only by predetermined user instructions therein but also by user instructions in another equivalent controller connected thereto by a common bus, and controlling the flags so that the statuses of the flags may be evaluated in accordance with predetermined user instructions and utilized as operational conditions.

Abstract: The input interface unit of the present invention is equipped with plural input terminals to be connected to external switches respectively, plural output terminals to be connected to input bus lines running to a central control unit (CPU), and plural current-controlling input terminals. These input terminals are divided into plural groups, and the input terminals in each group are connected commonly to each other through pull-down resistors, and then connected through current-carrying switches independently grouped for each terminal group to a power supply equipment built in the unit. And each of these current-carrying switches can be selected and turned on or off for control in response to signals supplied from the central control unit to the current-controlling input terminals.