JPH0720912A - Multipoint fetching device for optical on/off signal - Google Patents

Abstract

PURPOSE:To analyze signals and diagnose a fault by fetching multipoint signals of all points at the same time through the module of photodetecting elements which are as many as LEDs and in the same arrangement as the LEDs as to an LED signal for A monitor on the panel of a sequencer. CONSTITUTION:This device consists of the module of the photodetecting elements 5 which are equalized in number and arrangement to the monitor LEDs on the panel of the sequencer 1, a photodetection board 4 fitted with the module of the photodetecting elements 5, and a fitting part which fits the photodetection board 4 onto the panel of the sequencer 1 in conformity with the positions of the LEDs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention uses a sequencer,
Failure diagnosis of control equipment and manufacturing equipment, signal analysis system,
Regarding monitor system.

[0002]

2. Description of the Related Art Conventionally, an O
As a method of reading the N-OFF control signal, (1) it is directly coupled to the bus of the sequencer, and the signal is read in accordance with electrical consistency, timing, and protocol. (Fuji Electric SEREAN series data recorder, Yamatake Honeywell FA controller MA500). (2) Use the serial communication function supported by the sequencer to read the signal according to the protocol. (3) Directly connect the signal to the sequencer and the control device and read the signal. There was a method such as.

[0003]

However, the conventional method of reading the ON-OFF control signal from the control device such as a sequencer has the following problems.
That is, in the method (1), the reading speed is high, but the connector shape, electrical characteristics, and protocol of the sequencer are different for each sequencer, and thus lack versatility. Further, the method (2) is not versatile because the protocol is different for each sequencer. Further, since the serial communication is performed, the signal reading speed is slow and the signal accuracy is lowered.
In the method (3), although the target device has general versatility, it is necessary to match the difficulty of wiring (connection) and the signal level between the target device and the sequencer.

[0004]

In order to solve the above-mentioned problems, the present invention turns on / off a monitor LED provided in almost all sequencers by using a light receiving element (photodiode or photo diode). I / O signal status (ON or OF)
F) is taken in. That is, on the sequencer panel, a light receiving panel having the same number of light receiving elements arranged at a position facing a plurality of light emitting elements for displaying the operating state of the control device is provided with a mechanism for detachably attaching to the sequencer panel, on the other hand,
By setting the number and arrangement of the multi-point capturing device light receiving elements for the optical ON / OFF signals of the sequencer to be the same as those of the monitor LEDs, the failure diagnosing device can read the signals of all points at the same time.

[0005]

The arrangement of the monitor LEDs of the sequencer differs for each model, but by making the number and arrangement of the light receiving elements of the light receiving panel the same as those of the monitor LEDs, signals for all points can be sent at the same time. Can be read.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an optical on / off signal multipoint capturing apparatus of the present invention. The electrical signals of the multi-point capture device of the optical on / off signal of the present invention are input to the failure diagnosis device and used for signal monitoring, signal analysis and failure diagnosis. Further, the data is transmitted to a personal computer or the like by communication and the diagnosis result is displayed. In the figure, 1 is a sequencer, 2 is an I / O unit of the sequencer, and a signal from the unit is assigned to each LED of the monitor LED display section 3 for each input / output channel, Input / output ON / O
Each LED is turned on and off by the FF. 4 is
In the light receiving panel in which the light receiving elements are arranged on the panel surface, since the light receiving elements 5 are arranged on the surface of the light receiving panel main body 6 in the same number and the same arrangement as the monitor LEDs 3 of the sequencer monitor I / O unit 2, on the sequencer panel. Capture the ON / OFF state of the LED. The signal captured by the light receiving element 5 is used as the failure diagnosis device 7
Entered in. The fault diagnosis device 7 receives the input ON / O
The signal indicating the FF state is recorded in time series, and the failure diagnosis is performed by comparing with the first pattern of the ON / OFF signal of each LED or the initially set reference pattern. If the newly read pattern is different from the reference pattern, it is determined to be abnormal. The result of the diagnosis is taken in by communication to the personal computer 8 having the function of displaying the failure diagnosis result,
Display the fault diagnosis result.

FIG. 2 is a diagram showing a conventional example of a failure diagnosis system. A conventional failure diagnosis system has a failure diagnosis unit built in the sequencer body and functions as a failure diagnosis device dedicated to the device. Therefore, when there are different models, it is necessary to prepare a failure diagnosis device for each model.

FIG. 3 is a view for explaining the relationship between the light receiving element of the light receiving plate and the monitor LED of the sequencer. The light receiving board surrounds each light receiving element on the board with a guard 9 and eliminates the influence of light from an adjacent monitor LED and external light.

As described above, the optical on / off signal multi-point capturing device according to the present invention operates in a non-contact and electrically insulated state, and therefore does not affect the sequencer, the light receiving portion, and the diagnostic device. Also, with the guard attached to the light receiving part,
Not only can the influence of external light and the disturbance due to the leakage of light from the adjacent LED be prevented, but also the influence of dust in a bad environment can be eliminated by this guard. Furthermore, it can be installed and removed during operation, and the number of man-hours required is small.

[0009]

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the configuration of a failure diagnosis system.

FIG. 2 is a diagram showing a conventional example of a failure diagnosis system.

FIG. 3 is a diagram for explaining the guard of the light receiving element module of the failure diagnosis system. 1 Sequencer 2 Sequencer I / O unit 3 LED display part for monitor 4 Light receiving panel 5 Light receiving element 6 Light receiving panel body 7 Failure diagnostic device 8 Personal computer

Claims (1)

[Claims] 1. A sequencer for sequentially advancing each control step according to a predetermined order and displaying the control state by a plurality of light emitting elements arranged on a panel, facing the plurality of light emitting elements. A multi-point capturing device for optical ON / OFF signals of a sequencer, comprising a mechanism in which light-receiving panels having the same number of light-receiving elements arranged at the positions to be attached are detachably attached to the panel.