JPS6213032U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a digital switch according to this invention, FIG. 2 is a circuit diagram showing an example of this digital switch, FIG. 3 is a block diagram showing an example of a drive selection circuit for an operating status indicator, and FIG. Fig. 4 is a block diagram showing an example of an input inhibit circuit in this digital switch circuit, Fig. 5 is a front view showing an example of the use of this digital switch, and Fig. 6 is a circuit showing another example of the digital switch according to this invention. It is a diagram. 2a... Front plate, 4, 14... Display unit, 5, 6
...Push button, 7,8...Mechanical switch, 15...Reversible preset counter, 16...Display drive circuit,
17...Input/output circuit, 18...Pulse generation circuit,
19...Input/output control circuit, 20...Latch circuit,
21...Reset circuit, 22...Drive selection circuit,
35...Arithmetic processing circuit, 101...Input prohibition circuit.

Claims (1)

[Claims for Utility Model Registration] (1) A reversible preset counter capable of addition and subtraction;
A display that displays the data output and operating status of this reversible preset counter, a display drive circuit that drives this display, and an input/output that switches the signal line from the arithmetic processing circuit, etc. to each input/output and high resistance state. circuit, an input/output control circuit that applies a control signal to the input/output circuit for inputting a data signal from an arithmetic processing circuit, etc. to the reversible preset counter, and an operation switch set on the board side to control the reversible preset counter. The display drive circuit includes a pulse generation circuit that increments a set counter, and the display drive circuit selectively displays the operation status of the arithmetic processing circuit, etc. and whether or not the operation switch can be operated by lighting, extinguishing, or blinking on the operation status display. A digital switch characterized by being equipped with a drive selection circuit that allows (2) The digital switch according to claim 1, which is provided with a latch circuit that holds part or all of the signal input to the reversible preset counter. (3) A utility model equipped with an input prohibition circuit that prohibits input from an operation switch set on the front panel side to a reversible preset counter when an input prohibition signal from an external arithmetic processing circuit, etc. is applied. A digital switch according to registered claim 1 or 2.