Abstract: An input data reader apparatus includes a switch array or matrix which is formed of a plurality of switches and having input lines and output lines, one or more of the output lines being connected to one or more of the input lines according to a switch selection state of the switch array, a driver for supplying drive signals to the respective input lines of the switch array and defining input address data representing a line selection state of the input lines, and a buffer gate coupled to the output lines of the switch array and being responsive to sense signals which are obtained in accordance with the contents of the drive signals and with the switch selection state of the switch array, for generating output address data representing a line selection state of the output lines.

Abstract: A computer process control system includes at least one control section which is housed in a case and connected to a detection terminal and which automatically produces an operation signal for compensating for a difference between a process variable and a preset target value. At least one man-machine interface unit is included separate from the control section to display the process variable and the target value and to allow the operator to manually produce an operation signal. An output section is detachably connected to the control section and the man-machine interface unit and supplies one of the operation signals, in accordance with one of the corresponding operation modes, to a process actuator terminal. The man-machine interface unit is coupled to a selected loop to be supervised by the operator.

Abstract: A digital controller includes a central processor unit for generating a processed signal to be stored in an up-down counter. A manipulation signal generation circuit converts the contents of the up-down counter to a manipulation signal for an actuator. A feedback signal from a first coupling circuit connected to the up-down counter through a pulse width converter is applied to the central processor through an analog input circuit. The output signal of the up-down counter from the first coupling circuit and the output signal of the manipulation signal generation circuit are compared by a monitor circuit. An abnormality detection signal of the monitor circuit is generated as a result of the comparison and is applied to the central processor unit through a second coupling circuit.