Abstract: Address setting and initial data setting of an oil-resistant, water-resistant control/monitor terminal for performing address setting and initial setting of control/monitor terminals of a transmission control system in an oil-mist or humid environment. Also provided is optical communications or electromagnetic induction through a light transmission window provided in the control/monitor terminal using a data-setting-circuit-equipped console.

Abstract: An intermediate station transmits a supervisory signal sent form a given controlled device to a controlled device associate with the given device as a control signal. An intermediate-station input unit extracts a supervisory signal, which is a current signal superimposed on a signal transmitted through a data signal line, in every clock cycle. An intermediate-station output unit obtains the supervisory signal in every clock cycle, and outputs a control signal, which is a pulse-width-modulated voltage signal, onto the data signal line in the same clock cycle in which the supervisory signal has been extracted.

Abstract: A master station has a master-station transmission circuit that extracts a serial monitor signal so as to convert a control data signal into monitor data by changing a duty ratio of negative and positive voltage-level periods, converting the control signal into a serial pulsing voltage signal, transmitting a monitor data signal that is superimposed on the serial pulsing voltage signal, and detecting the presence or absence of a signal of a current that flows during the negative and positive voltage-level periods. A plurality of slave stations respectively have a slave-station transmission circuit that identifies a duty ratio of the positive and negative voltage-level periods relative to each serial pulsing voltage signal, that extracts a control data signal so as to output the data to a controllable unit of the slave station.

Abstract: A parent station output section changes a duty factor between a period in which a control data signal is at a level (high-potential low-level) lower than a power supply voltage Vx but higher than high-level signal in other circuit portions and a subsequent period in which the control data signal is at the power supply voltage Vx level to convert the control data signal into a serial pulse voltage signal and output the voltage signal onto data signal lines D+ and D? in accordance with each data value in the control data signal inputted from a controller in each cycle of a clock.

Abstract: An intermediate station transmits a supervisory signal sent form a given controlled device to a controlled device associate with the given device as a control signal. An intermediate-station input unit extracts a supervisory signal, which is a current signal superimposed on a signal transmitted through a data signal line, in every clock cycle. An intermediate-station output unit obtains the supervisory signal in every clock cycle, and outputs a control signal, which is a pulse-width-modulated voltage signal, onto the data signal line in the same clock cycle in which the supervisory signal has been extracted.

Abstract: A parent station output section changes a duty ratio between a period of a level other than a predetermined power-supply voltage level and a subsequent period of the power-supply voltage level according to each data value of a control data signal to convert the control data signal into a serial pulse voltage signal and output it onto a data signal line. A parent station input section detects a supervisory data signal superimposed on the serial pulse voltage signal transmitted over the data signal line as the presence or absence of a current signal generated by contention between the supervisory signal and the power-supply voltage on the rising edge of the power-supply voltage.

Abstract: A parent station output section changes a duty factor between a period in which a control data signal is at a level (high-potential low-level) lower than a power supply voltage Vx but higher than high-level signal in other circuit portions and a subsequent period in which the control data signal is at the power supply voltage Vx level to convert the control data signal into a serial pulse voltage signal and output the voltage signal onto data signal lines D+ and D− in accordance with each data value in the control data signal inputted from a controller in each cycle of a clock.

Abstract: In a programmable controller, logical operation between I/O data are performed in accordance with each instruction of a user program optionally set by the user, and simultaneously output data is updated in accordance with the result of its logical operation. The state of inhibiting the control output, at detection of an abnormality in the device at a particular control status, can be optionally set by the user as part of the user program. An abnormal signal of each controller is transmitted to each controller when a controller system of parallel link mode is constituted by plural sets, further whether intra machine control output action is inhibited or not by an abnormal signal from another machine can be optionally set by the user as part of the user program.