JPH05183964A - Monitor signal read-in circuit - Google Patents

Abstract

PURPOSE:To provide a monitor signal read-in circuit capable of reading in monitoring signals of multiple items by one buffer. CONSTITUTION:This circuit is made in such a way that wiring in matrix shape is performed by connecting one of plural monitor signals M1-M16 and monitor common signals M1a-M16a inputted at dry contacts are directly connected to the buffer 1, and connecting the other to the buffer 1 via read-in signals R1, R2, and read-in is performed by controlling one of the monitor signals M1-M16 and the monitor common signals M1a-M16a by the read-in signals R1, R2. Thereby, it is possible to perform read-in processing on the monitor signals of multiple items by one buffer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor signal reading circuit, and more particularly to a monitor signal reading circuit for reading a dry contact monitor signal.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional monitor signal reading circuit. The dry contact monitor signal input to the monitor signal M1 and the monitor common signal M1a is read as data D1 by the read signal R1 of the buffer 20.
Similarly, the monitor signal M2 and the monitor common signal M2a to the monitor signal M8 and the monitor common signal M8a are read as data by the buffer 20. The subsequent monitor signal M9 is read into the new buffer 21 as data. The monitor items exceeding 16 are dealt with by increasing the buffer.

[0003]

In the conventional monitor signal reading circuit as described above, one buffer is required for the monitor signals of eight items, and therefore the circuit is required for the monitor signals of many items. There was a problem that it became large and complicated.

The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a monitor signal reading circuit capable of reading multi-item monitor signals with a single buffer.

[0005]

In order to achieve the above object, the monitor signal reading circuit of the present invention includes a plurality of monitor signals and a monitor common signal input at a dry contact.
One of them is directly connected to the buffer, the other is connected to the buffer via a read signal and wired in a matrix, and one of the monitor signal and the monitor common signal is controlled and read by the read signal.

[0006]

According to the present invention, one of the monitor signal and the monitor common signal, which are wired to the buffer in a matrix, is read into the buffer by controlling the read signal.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration block diagram of a monitor signal reading circuit according to an embodiment of the present invention. As shown in FIG. 1, in the present monitor signal reading circuit, the monitor signal M1
And monitor signal M9, monitor signal M2 and monitor signal M1
0, hereinafter monitor signals M8 and M16 are connected to the buffer 1 by common signal lines.

Of the dry contact monitor signals of the monitor signal M1 and the monitor common signal M1a, the monitor common signal M
1a, similarly the monitor common signal M2a to the monitor common signal M8a are connected to the read signal R1, and the monitor common signal M9a to the monitor common signal M16a are connected to the read signal R2. Further, the buffer 1 is connected with the data D1 to the data D8 and the readable signal 2.

As described above, by arranging the monitor signals in a matrix and sequentially controlling the read signal R1 and the read signal line R2 in accordance with the read enable signal 2,
The data D1 to the data D8 can be read through the buffer 1. Since the monitor common signal is controlled by the read signals R1 and R2 as described above, it becomes possible to read the monitor signals of many items with one buffer 1. As the monitor signal, for example, a synchronization signal (monitor common signal) and a momentary signal (monitor signal), a collector and emitter output signal of a photocoupler, etc. are used.

[0010]

As described above, in the monitor signal reading circuit of the present invention, the monitor signals of the dry contacts are wired in a matrix, and one of the monitor signals is controlled by the read signal, so that the monitor signals of many items can be obtained. It is possible to obtain an effect of reading and processing with a single buffer.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a monitor signal reading circuit according to an embodiment of the present invention.

FIG. 2 is a configuration block diagram of a conventional monitor signal reading circuit.

[Explanation of symbols]

 1 ... Buffer 2 ... Readable signal M1-M16 ... Monitor signal M1a-M16a ... Monitor common signal R1, R2 ... Read signal

Claims (1)

[Claims] 1. One of a plurality of monitor signals and a monitor common signal input at a dry contact is directly connected to a buffer, and the other is connected to the buffer via a read signal and wired in a matrix. A monitor signal reading circuit, characterized in that one of the monitor signal and the monitor common signal is read by being controlled by a read signal.