JPH0635531A - Diagnostic method and device for controller - Google Patents

Abstract

PURPOSE:To obtain a learning pattern in accordance with the input/output state of a controller despite the different systems of the controller by comparing the learning pattern formed by the input/output signals with the measurement pattern of the controller to be diagnosed. CONSTITUTION:It is supposed that a PC main body 10 is previously checked and normally functions to drive and control a controlled unit 16 in a normal way. Under such conditions, the sampling time of the input data is set by a sampling time setter 36 of a diagnosing device 20 of a controller. At the same time, a mode switch 38 is set in a learning mode. When the drive of the device 20 is started, a CPU 22 fetches the sampling time of the input data set by the setter 36 and the learning mode set by the switch 38 and then stores them in a RAM 26. Then the CPU 22 stores the input signal supplied to an input unit 12 and the output signal sent from an output unit 14 into the RAM 26 and forms a learning pattern in a prescribed time unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diagnostic method and device for a control device.

[0002]

2. Description of the Related Art Conventionally, a programmable controller (hereinafter referred to as P
C) is often used, but a dedicated diagnostic program corresponding to the PC model is required for the diagnosis. Therefore, there is a problem that diagnosis cannot be performed if the model of the PC changes. Also, although there are models of recent PCs that are capable of performing a diagnosis by providing a dedicated module for diagnosis, it is necessary to provide a considerable diagnostic program in order to perform the desired diagnosis. Further, there is a problem in that the relay control panel does not consider such a diagnostic device at all. The present invention has been made in order to solve such a problem, and makes it possible to perform a diagnosis regardless of the model of the PC or the type of the control device and the user's diagnosis without requiring a special program or the like. An object of the present invention is to provide a diagnostic method and device for a device.

[0003]

A diagnostic method for a control device according to the present invention comprises a step of taking an input / output signal of a normally functioning control device to form a learning pattern, and a control device of a control device to be diagnosed. The method includes a step of taking an input / output signal and forming a measurement pattern, and a step of comparing the measurement pattern and the learning pattern and determining that they are abnormal when the two do not match. The diagnostic device of the control device according to the present invention,
An input circuit for receiving the signal of the input / output terminal of the control device, a storage means, and an input / output signal of the control device which is functioning normally are input through the input circuit, and a learning pattern corresponding to the input signal is formed. Stored in the storage means, and further, input / output signals of the control device to be diagnosed are input through the input circuit to form a measurement pattern corresponding to the input signal. And an arithmetic means for estimating the abnormality by judging the patterns of the both.

[0004]

In the present invention, the learning pattern is formed in advance by taking in the signals of the input / output terminals of the control device of the same model as the control device to be diagnosed and having a normal function, and the control for the next diagnosis is performed. A signal from the input / output terminal of the device is taken in to form a measurement pattern, and the measurement pattern and the learning pattern are compared with each other to determine whether the measurement pattern is normal or abnormal. Therefore, even if the control device is different, a learning pattern corresponding to the control device can be obtained, and the measurement pattern can be compared with the learning pattern. Can also be diagnosed.

[0005]

1 is a block diagram showing the configuration of a diagnostic device for a control device according to an embodiment of the present invention. In the figure, 2
Reference numeral 0 is a diagnostic device for the control device, 22 is a CPU, 24 is a ROM that stores system programs and the like, 26 is a RAM that stores data such as learning patterns, and 28 is various character comments and the like. The RAM, 30 is a display interface, and 32 is an output port for outputting a diagnostic result to a control device such as a PC. Reference numeral 34 is an input unit for inputting signals from an input unit and an output unit of the control device described later. 36 is a sample time setting device for setting the sampling time of the input signal, 3
Reference numeral 8 is a mode switch for switching between the learning mode and the diagnosis mode.

FIG. 2 is a block diagram showing a state in which the diagnostic device of FIG. 1 is connected to a PC as an example of a control device.
In the figure, 10 is a PC main body, to which an input unit 12 and an output unit 14 are mounted as shown. Reference numeral 16 is a controlled device, which is an input unit 1
2 and the output unit 14, and desired control is performed. The diagnostic device 20 is also the input unit 12 of the PC body 10.
And an output signal (control signal) supplied to the controlled device 16 from the output unit 14 and an input signal input from the controlled device 16 to the input unit 12, respectively. Further, the diagnostic device of FIG. 1 may not be directly connected to the input / output units 12 and 14 of the PC as in FIG. 3, but may be connected to the terminal block in the case of a wiring structure through the relay terminal block 17.

Next, the operation of the learning mode of the diagnostic device 20 of the control device will be described. First, each device is connected in the state of FIG. At this time, the PC main body 10 that has been previously checked and judged to be functioning normally is used.
Drive is normally controlled. In this state, the sample time setting device 36 of the diagnostic device 20 of the control device is
The input data sampling time is set by, and the mode switch 38 is set to the learning mode. When the diagnostic device 20 of the control device is started to be driven, the CPU 22 takes in the sample time of the input data set by the sample time setting device 36 and the learning mode set by the mode switching device 38 and stores it in the RAM 26, for example. And CPU
22 is a timing according to the sample time, which captures an input signal input to the input unit 12 of the PC main body 10 and an output signal output from the output unit 14 via the input port 34 and stores them in the RAM 26 for a predetermined time. A learning pattern is formed in units.

FIG. 4 is an explanatory diagram showing an example of the learning pattern stored in the RAM 26. As shown, a plurality of learning patterns 40a, 40b ... Are stored. When the predetermined number of learning patterns are stored in the RAM 26, the learning mode operation ends. In the learning mode, in addition to sampling all inputs to extract a desired learning pattern, all signals for one cycle of the signal waveform applied to a specific input circuit of the diagnostic device 20 of the control device are sampled. It is also possible to easily adopt a learning pattern.

Next, the operation of the diagnostic device 20 of the control device in the diagnostic mode will be described. Also in this case, each device is connected in the state shown in FIG. In this state, the mode switch 38 of the diagnostic device 20 of the control device is set to the diagnostic mode. This P
Unlike the one in the learning mode described above, the C body 10 is about to receive a diagnosis.
When the diagnostic device 20 of the control device is started to drive, the CPU 22
The input signal input to the input unit 12 of the PC body 10 and the output signal output from the output unit 14 are fetched via the input port 34 and stored in the RAM 26 at the timing according to the same sample time as the above case. , Forming a measurement pattern in a predetermined time unit. And CP
U22 compares the measurement pattern obtained here with the already stored learning pattern, and if there is a match, it reads a message indicating that it is normal from the RAM 28 and displays it on the display interface 30 or the output port 32. Via an external device (not shown). If there is no match, a message corresponding to the mismatch condition is read from the RAM 28 and the display interface 3 is read.
0 or output to an external device via the output port 32.

FIG. 5 is an explanatory diagram showing another example of the learning pattern stored in the RAM 26. The input signal input to the input port 34 of this embodiment at a predetermined timing is patterned 41a, 41b .... In the learning mode, such a learning pattern is created in the same manner as the above case.
Each learning pattern is composed of a portion 42 corresponding to the terminal number of the input / output signal and its signal 43 as shown in the figure. In the diagnostic mode, it is determined whether the measured pattern matches the learned pattern, and if not, it is determined that there is an abnormality.

By the way, the learning pattern and the measurement pattern may change in timing depending on the type of controlled device even during normal operation. It goes without saying that in such a device, the learning pattern and the measurement pattern can be given a certain time margin. Further, in the present invention, a multifunctional controlled device may have a plurality of operation patterns. In this case, it naturally has a function of storing a plurality of learning patterns, determining which pattern is the currently input measurement pattern, and making a diagnosis. In the present invention, in the case of FIG. 2, the learning pattern is formed by taking in the signals of the input / output terminals of the control device of the same model as the PC to be diagnosed and having a normal function, and the next diagnosis is made. It suffices that the measurement pattern is formed by taking in signals from the input / output terminals of the PC, the measurement pattern is compared with the learning pattern, and normality or abnormality is judged based on the match or mismatch. It is not limited to.

[0012]

As described above, according to the present invention, the learning pattern formed based on the input / output signal of the control device having a normal function and the measurement based on the input / output signal of the control device to be diagnosed. Since it is determined whether the pattern is normal or abnormal by comparing the pattern with the matching or non-matching, a learning pattern corresponding to the input / output state can be obtained even if the control device method is different, and the measurement pattern and the learning Since it only has to be compared with the pattern, it can be applied to all control devices.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a diagnostic device for a control device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a state in which the diagnostic device of FIG. 1 is connected to a PC.

FIG. 3 is a block diagram showing another connection example of the diagnostic device of FIG.

FIG. 4 is an explanatory diagram showing an example of a learning pattern stored in a RAM.

FIG. 5 is an explanatory diagram showing another example of a learning pattern stored in a RAM.

Claims (2)

[Claims] 1. A step of capturing an input / output signal of a normally functioning control device to form a learning pattern, a step of capturing an input / output signal of a control device to be diagnosed to form a measurement pattern, A method of diagnosing a control device, comprising: comparing a measurement pattern with the learning pattern, and determining an abnormality when they do not match. 2. An input circuit for taking in a signal of an input / output terminal of a control device, a storage means, and an input / output signal of a control device which is functioning normally, and a learning corresponding to the input signal. A pattern is formed and stored in the storage means, and further, an input / output signal of the control device to be diagnosed is input through the input circuit to form a measurement pattern corresponding to the signal, and then, Comparing the measurement pattern and the learning pattern,
A diagnostic device for a control device, which has an arithmetic means for determining an abnormality when the two do not match.