JPS6037010A - Detector for fault area of controller - Google Patents

Abstract

PURPOSE:To recover a fault of a controller at an early state and to improve greatly the working efficiency by coding mutually supplied signals to compare them with a code of a normal state and therefore obtaining the information which can specify the fault area to display this information. CONSTITUTION:When the type of work is changed, a type code corresponding to the type of the work selected only when a start signal is turned on is sent to a control circuit 52 for turning angle of a rotary table from a sequence con- trol circuit 50. Then a signal related to an ending action is delivered from the circuit 52. While the signal transferred between the circuits 50 and 52 are supplied partially to a diagnosis circuit 56 via a signal line 66a, etc. Therefore, this signal undergoes once the arithmetic processing through the circuit 56 and is sent to a recording circuit 58 from the circuit 56 to be compared with the data on the signal stored in the circuit 58. The result of this comparison is read out and displayed at a display circuit 60 in the form of an error code.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a failure location detection device in a control device,
More specifically, in an automatic machine equipped with a control device having two or more control functions, the control devices are configured to operate by exchanging information with each other for each control function in order to achieve the aforementioned functions. The present invention relates to a fault detection device in a control device for reliably and quickly detecting a fault in a circuit that achieves any one control function to avoid a long-term down state of an automatic machine.

For example, in a configuration that incorporates units with two or more control functions to automatically control the operation of a machine tool, when these units are interconnected to exchange information, the machine When an operational problem occurs, it is difficult to determine which control system is causing the problem.

In other words, in the prior art, a failure of a machine tool or an electrical control circuit incorporated therein can be detected by self-diagnosis of the control circuits, but if two or more control circuits are connected via electric wires ( In connection configurations, etc., it has been impossible to quickly and reliably search for causes of failures such as machine failure due to external factors, failures due to operation timing, poor wiring, etc. Therefore, it takes a lot of time to investigate the cause. was wasted, causing the line to be inactive for a long period of time, resulting in a number of problems, including deterioration of production efficiency and expansion of economic losses.

The present invention has been made in order to eliminate the above-mentioned disadvantages at once, and includes a control circuit on at least two sides connected to an automatic machine, and a signal that connects the control circuits to each other and sends a control signal. line, a fault diagnosis circuit connected to the signal line, a recording circuit connected to the fault diagnosis circuit, and an error code display circuit, and the normal operation signal of the automatic machine is encoded and recorded in advance in the recording circuit. Then, the operating signal of the automatic machine exchanged between the control circuits is introduced into the recording circuit via the signal line, and this signal is compared with the normal operating signal to generate an error code signal from the fault diagnosis circuit. The system is characterized in that it emits an error code and detects the location of the failure using this error code.

Next, a preferred embodiment of the failure location detection device in the control device of the present invention will be described in detail with reference to the accompanying drawings.

First, a pallet type jig stand type processing device will be cited as a good example.

The pallet type jig stand type machining device indicated by the reference numeral 10 in FIG. It basically consists of. The main body 14 includes
A throat 20 is attached to a machining machine to which tools such as drills and taps are detachably attached. In practice, the processed navel i'2
There are a plurality of tools 0, each of which is disposed on the main body 14 with a displacement of 90 degrees, and is rotatably supported on the main body 14 so that a different tool faces the work depending on the type of work. .

On the other hand, as can be easily understood from FIG. 2, the workpiece support section 16 includes a U-shaped machine frame 24 erected on a pedestal 22 placed on the base 12, and the lower part of the inner space thereof. A pair of rotary tables 26a and 26b are arranged. At this time,
Worm gear 28 on each rotary table 26aSb
a and 28b are arranged, and these worm gears 28
a and 28b are configured to mesh with worms 32a and 32b rotated by DC motors 30a and 30b. Incidentally, plate-shaped support members 36a and 36b are provided upright on the pivots 11i34a and 34b which are located above the worm gears 28a and 28b and are coaxial therewith, and from the upper ends of these support members 36a and 36b, horizontal direction Board 3
8a, 38b, and further these plate bodies 38a,
38b, the center shaft 40a is inserted from above the horizontal part of the machine frame 24.
, 40b extend through and pivotally support these plates. Therefore, the work W1 and the work W2 are placed on the pallets 42a and 42.
If the worms 32a, 32b are fixed to the worms 32a, 32b and fixed to the worms 32a and 32b, the worms 32a and 32b are rotated by energizing the DC motor 30a and 130b. , since the worm gears 28a, 28b also rotate accordingly, the turning table 34a.

34b rotates around a vertical axis, that is, center axis 40a, 40b. In the end, the bullet 42a is locked to the support members 36a and 36b to rotate by a predetermined angle.
, 42b are also displaced, and the tools 18a,
b, respectively, facing each other at a predetermined indexing angle and being subjected to processing.

Therefore, in the above-described configuration, in the present invention, a control circuit 50 and a control circuit 52 are incorporated into the pallet type jig stand type processing apparatus 10 (see FIG. 3). One output side of the recontrol circuits 50 , 52 is respectively connected to the processing device 10 , and the other output side is connected to a diagnostic circuit 56 , which constitutes a diagnostic device 54 . Diagnostic circuit 56 connects to and provides an output to recording circuit 58 while recording circuit 58
The input side of the display circuit 60 is also connected to the diagnostic circuit 56 and receives the output from the diagnostic circuit. Note that the control circuits 50 and 52 are configured to introduce their outputs to each other. Actually, n signal lines 62a162b, 6
2C1... are derived, and n signal lines 64a, 64 are also connected from the control circuit 52 to the control circuit 50.
b, 64c, . . . are derived (see FIG. 4). Note that signal lines 66a, 66b, 66c, . . . are led out from the respective signal lines 62a, . . ., 64a, .

Therefore, in the circuit configuration as described above, the control circuit 50
An example will be described in which numerals 52 and 52 are a sequence control circuit and a rotary table rotation angle control circuit, respectively, which are incorporated in the pallet type jig stand type processing apparatus, and the operating state of this rotary table is diagnosed.

First, during the machining operation, the workpieces W1 and W2 are moved by the tool 18.
Therefore, the rotary tables 26a, 26b are in the position shown in FIG.
This state is maintained until the machining operation is completed. When the machining operation is completed, the rotary tables 26a, 26
b needs to be returned to its original position. Then, the sequence control circuit 50 is energized and a rotary table origin return command signal is sent to the rotary table rotation angle control circuit 52 via the signal line 62a (step 1 in FIG. 6).

At this time, the sequence control circuit 50 keeps the home return command signal on for 30 seconds using a timer (not shown) (step 2 in FIG. 6). The turning angle control circuit 5
In step 2, in response to this home return command signal, a home return signal is sent to the sequence control circuit 50 via the signal line 64a. In this case, the origin return command signal rises within the time t1 (see Figure 7), for example, 30 seconds counted by the timer (Step 2 in Figure 6), and the sequence control circuit 50 (step 3.4 in FIG. 6), an error code signal is issued after the elapse of said time t1 (step 5 in FIG. 6). - For example, in the case of magnetic sensor type positioning, it will indicate loosening or disconnection of the terminal of the signal line from the magnetic sensor. On the other hand, if the return-to-origin signal rises within the time t1, it is assumed that the device is in a normal state. Therefore, a new time of up to 30 seconds, ie, time t2, is set in the timer (step 6 in FIG. 6). If the return-to-origin completion signal is sent from the rotation angle control circuit 52 to the sequence control circuit 50 via the signal line 64b within this time t2, the rotary rotation angle control circuit 52
z26a, 26b will show that it has returned normally to the position of FIG. 5 (bl) (FIG. 6 step 7.8).

On the other hand, if the home return completion signal is not issued within the time t2, an error code signal is issued after that time (sixth
(Fig. step 9.10), this may occur, for example, as the positioning component does not issue a return-to-home completion signal.
It is assumed that the cause of the failure lies within the positioning component.

Next, an example of diagnosing a state of change in the rotation angle of the rotary table due to a change in the type of workpiece in the above embodiment will be described.

First, when the type of workpiece to be processed is changed as shown in the flowchart of FIG. 8, the sequence control circuit 50 (see FIG. 4) is energized and a start signal is sent via the signal line 62b. The signal is sent to the rotary table rotation angle control circuit 52. Next, only when the start signal is on, the model code 1' corresponding to the selected workpiece type is sent to the turning angle control circuit 52 via the signal line 62C, and is then sent to the control circuit 52. The model code will be imported. As shown in FIG. 9, the model code sent from the sequence control circuit 50 differs depending on the selected model, but in any case, the pulse signal related to the model code remains unchanged until the next start signal rises. If it does not change to (
In step 3) of FIG. 8, it is confirmed that they are the same model, and it is inferred that they are in a normal state.

Next, when the work model change operation is completed, a signal related to the completion operation is sent from the turning angle control circuit 52 to the sequence control circuit 50. In this case, the turning angle control circuit 52 and the sequence control circuit 50
The signal line 64b connected between the two is utilized. The completion signal is coded as shown in Figure 9 fc),
It is set so that it changes and rises just before the next activation signal is turned on, and then the change increases by one as 0-1-42→.... Therefore, if the completion code changes as described above, it is in a normal state. On the other hand, if the completion code does not follow this change, for example, there is some problem with the CPU card in the positioning component or the wire harness connected to these. (Steps 5 and 6 in Figure 8).

Therefore, if it is determined that the device is in a normal state, it is determined whether the activation signal turns on after a predetermined period of time has elapsed, and if the activation signal turns on, it is determined that the device is in a normal condition and returns to the step of retrieving the model code (step Figure 8 Step 7). on the other hand,
If the activation signal does not turn on, it is determined whether or not the model code has changed (Step 8 in Figure 8). If it has changed, an error code is generated because it is assumed that there is a cause of failure between the model code detector and the positioning component. (Step 9 in Fig. 8).

In the two embodiments described above, the signals exchanged between the sequence control circuit 50 and the rotary table rotation angle control circuit 52 are introduced into the diagnostic circuit 56 via the signal line 668 or the like on one side. Therefore, in practice, the signal once enters the diagnostic circuit 56, processes the signal, and is sent from the diagnostic circuit 56 to the recording circuit 5B.
Compare the data for the signal stored in the recording circuit 58 and read the result as an error code;
This will be displayed on the display circuit 60.

Therefore, a display device 68 related to the display circuit 60 is shown in FIG. The display device 68 incorporates the display circuit 60, and has a power switch 70, a mode changeover switch 72, a start/stop push button 74, and a plurality of L
An ED 76 and a keyboard 78 are arranged. The mode selector switch 72 is used to switch between a program mode in which the signal change history recorded in the recording circuit 58 is checked and self-diagnosis is performed, and a check mode in which input and output for positioning are monitored and abnormal signals are checked. used. Further, the LED 76 displays ON 10FF of the input/output signal for positioning. The keyboard 78 consists of a display area section 80 and a key section 82 in which a plurality of keys are arranged, and the display area section 80 includes a mode display area 84.
, a self-diagnosis function number display area 86, a data number display area 88, and an error code display area 90. In particular, the error code is displayed in this error code display area 90. Further, the key portion 82 is used for clearing data, loading data stored in the memory into the data display area, and the like.

According to the present invention, as described above, control signals are exchanged between two or more control systems incorporated in an automatic machine, and the signals sent to each other are coded and compared with the code in the normal state. Since error codes are displayed as information that allows the location of failure to be identified, equipment failures can be repaired quickly, smooth operation of the entire line is achieved, and work efficiency is greatly improved.

Although the present invention has been described above with reference to a preferred embodiment, the present invention is not limited to this embodiment. It goes without saying that various improvements can be made without departing from the spirit of the present invention, such as achieving the same objective.

[Brief explanation of drawings]

FIG. 1 is a partially omitted side view of a pallet-type jig processing device incorporating a failure location detection device according to the present invention, and FIG.
1 is a perspective view of the processing device shown in FIG. 3, FIG. 3 is a block circuit diagram of the failure location detection device of the present invention, and FIG. A control circuit is used as the rotary table rotation angle control circuit, and the second control circuit is a rotary table rotation angle control circuit, and an explanatory diagram showing the connection relationship between these circuits and a diagnostic circuit. Figure 5 (al indicates the position where the rotary table has finished machining, and the mountain in Figure 5) indicates the position where the rotary table has returned to its original position.
The figure is a flowchart showing the generation and reception of signals between the sequence control circuit and the rotary table rotation angle control circuit until the rotary table returns to its original position, and the location of the failure.
FIG. 7 is a time chart showing the generation and reception of the signals shown in FIG. 6, and FIG. 8 is a time chart showing the signal transmission and reception between the sequence control circuit and the rotary table rotation angle control circuit for changing the model of the workpiece, and the failure location. 9 shows the generation and reception of the signals shown in FIG. 8, and FIG. 10 shows the entire panel of the display device. lO...Processing equipment 12...Base 14...Main body 16...Work support section 18...Tool 20...Processing heel 22...Pedestal 24...Machine frame 26...Rotary table 28...Worm gear 30... DC motor 32... Worm 34... Turning table 36... Support member 38... Plate body 40... Center shaft 42... Pallet 44... Guide member 50. 52... Control circuit 54... Diagnosis device 56... Diagnostic circuit 58...Recording circuit 60...Display circuit 62.64.66...Signal line 70...Power switch 7
2...Mode selection switch 74...Start/stop push button 76...L E D 7B...Keyboard 80...Display area section 82...Ki part 84...Mode display area 86...Self-diagnosis function number display area 88...Data number display area 90...Error code display area Patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] (1) At least two control circuits connected to the automatic machine, a signal line that connects the control circuits to each other and sends control signals, a failure supply/disconnection circuit connected to the signal line, and the failure diagnosis. It consists of a recording circuit connected to the circuit and an error code display circuit, and the normal operation signal of the automatic machine is encoded and recorded in advance in the recording circuit, and the operation signal of the automatic machine is exchanged between the control circuits. is introduced into the recording circuit via the signal line, this signal is compared with the normal operation signal, an error code signal is generated from the failure diagnosis circuit, and a failure location is detected using this error code. Fault location detection device in control equipment.