JP2004341690A - Control panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control panel for quickly grasping the factor of the emergency stop of an industrial machine. <P>SOLUTION: A control panel 3 of a pendant device or the like is provided with an emergency push button switch 31 for executing the emergency stop of an industrial machine. The emergency push button switch 31 is configured to execute the opening/closing operations of first and second switch contacts 32 and 33 serially connected to a controller while being interlocked with the pushing operation of the operation button, and to execute the opening/closing operation of a third switch contract 34 connected to an internal processing circuit 35 while being interlocked with the pushing operation of the operation button. The internal processing circuit 35 is configured to detect the pushing operation of the emergency push button switch 31 by monitoring the opening/closing status of the third switch contract 34. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an operation panel for operating an industrial machine or the like, and more particularly to an operation panel provided with an emergency push button switch for emergency-stopping an industrial machine or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in order to remotely control an industrial machine such as an industrial robot, a portable operation panel called a pendant device or the like connected to a control device of the industrial machine by a cable is used. The portable operation panel is useful because it can perform an instruction operation while confirming its operation from an arbitrary position around the industrial machine. Such a portable operation panel is provided with an emergency push button switch for emergency stop of the industrial machine in an emergency. The emergency push button switch provided on the portable operation panel has a switch contact having two contact points in order to increase the reliability of the emergency stop function, and each contact point is connected in series with the main circuit of the control device. (For example, Patent Document 1).
[0003]
In the portable operation panel as described above, when one of the switch contacts changes from the closed state to the open state, the industrial machine stops. For example, when the emergency push button switch is pressed, each contact changes from the closed state to the open state, the main circuit of the control device is cut off, and the industrial machine is stopped emergency. Then, a signal indicating that the industrial machine is in an emergency stop is fed back to the portable operation panel via a data communication cable by a sub-circuit of the control device.
[0004]
The sub-circuit of the control device monitors the state of both contacts, and if they do not match, thereby detecting a faulty state such as a broken cable. Even when such a defective state is detected, a signal indicating a disconnection or the like is fed back from the control device to the portable operation panel.
[0005]
[Patent Document 1]
Patent No. 33331875 [0006]
[Problems to be solved by the invention]
However, in the conventional configuration, since a signal is fed back from the control device to the portable operation panel, the information indicating the emergency stop is transmitted to the portable operation panel with a delay, and the operator is informed of the situation. There is a problem that it takes time to grasp.
[0007]
When a plurality of emergency push button switches are provided for the control device of the industrial machine, whether the emergency push button switches of the portable operation panel are pressed or other emergency push button switches are pressed There is also a problem that it cannot be determined whether the button has been pressed.
[0008]
Furthermore, when the wiring cables connected to both of the two-contact configuration as described above are disconnected at the same time, the control device cannot determine whether the disconnection or the emergency push button switch has been pressed. is there.
[0009]
In view of the above, an object of the present invention is to provide an operation panel capable of quickly grasping the cause of an emergency stop of an industrial machine when the industrial machine is stopped.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is an operation panel connected to a control device of an industrial machine for remotely operating the industrial machine, wherein the operation panel performs internal processing. A processing circuit and, in order to perform an emergency stop of the industrial machine, perform opening and closing operations of first and second switch contacts connected in series to the control device in conjunction with a pressing operation of an operation button, An emergency push button switch for opening and closing a third switch contact connected to the internal processing circuit in conjunction with a pressing operation of the operation button, wherein the internal processing circuit includes the third switch contact The operation of pressing the operation button is detected by monitoring the open / close state of the operation button.
[0011]
According to a second aspect of the present invention, in the operation panel according to the first aspect, a display unit for displaying information is further provided, and the internal processing circuit is configured to be able to perform data communication with the control device, When the push operation of the operation button is detected, the detection result is displayed on the display unit, and when a signal indicating that the industrial machine is stopped is received from the control device, based on the detection result of the push operation, Thus, information on whether or not the operation button has been pressed is displayed on the display means.
[0012]
According to a third aspect of the present invention, in the operation panel according to the first or second aspect, the internal processing circuit is configured to be capable of data communication with the control device, and based on an open / close state of the third switch contact. It is characterized in that information on the presence or absence of the pushing operation is transmitted to the control device.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external view showing a configuration example of an industrial machine system according to the present embodiment, and FIG. 2 is a functional block diagram showing an internal configuration thereof.
[0014]
The industrial machine system 1 supplies power to an unillustrated industrial machine, and is connected to a control device 2 that controls the operation of the industrial machine via a cable 9 to remotely control the industrial machine. And a portable operation panel 3.
[0015]
The portable operation panel 3 is configured as a so-called pendant device, so that an operator can carry it freely within a movable range defined by the cable 9. The portable operation panel 3 has a liquid crystal display (LCD) 30 for displaying the operating status of the industrial machine by the control device 2 and the like, and the emergency stop of the industrial machine is performed by pressing the operation button 31a in an emergency. An emergency push button switch 31 is provided. In addition, various button switches (not shown) and the like are provided for giving operation instructions to the industrial machine.
[0016]
The control device 2 is a device installed near an industrial machine, and an operation panel 21 is provided for the control device 2 as well. In this example, the operation panel 21 is also provided with an emergency push button switch 22.
[0017]
As shown in FIG. 2, the portable operation panel 3 is provided with an internal processing circuit 35 and a communication circuit 37 as its internal configuration in addition to the LCD 30 and the emergency push button switch 31 described above. Further, the internal processing circuit 35 is further provided with a detection circuit 36.
[0018]
In addition to the emergency push button switch 22 described above, the control device 2 includes a mismatch detection circuit 25, an internal processing circuit 26, and a communication circuit as its internal configuration, which are used when an industrial machine is stopped in an emergency. Function as a sub-circuit. In addition to the above, the control device 2 is also provided with a main circuit such as a power supply circuit for supplying power to the industrial machine when the industrial machine is in an operating state. Is omitted.
[0019]
The emergency push button switch 31 of the portable operation panel 3 is provided with three or more switch contacts, at least two of which function as emergency contacts for emergency stop of the industrial machine, and at least one contact is provided. The portable operation panel 3 is configured to function as a monitoring contact for detecting the pressed state of the operation button 31a on the portable operation panel 3. However, FIG. 2 illustrates a case of a three-contact configuration of the first to third switch contacts 32, 33, and 34, and these switch contacts 32, 33, and 34 are interlocked with the pressing operation of the operation button 31a. To switch between the open state and the closed state. In other words, the opening and closing switching operation of all the switch contacts 32, 33, 34 is performed simultaneously by one pressing operation of the operation button 31a. Among the first to third switch contacts 32, 33, 34, the first and second switch contacts 32, 33 are emergency contacts for emergency stop of the industrial machine in an emergency. The contact 34 is a monitoring contact for detecting the pressed state of the operation button 31a.
[0020]
Each of the first and second switch contacts 32 and 33 is connected in series to the main circuit of the control device 2. For example, the switch contacts 32 and 33 are closed when the operation button 31a is not pressed, and are in a state of supplying power to the industrial machine. When the operation button 31a is pressed, the switch contacts 32 and 33 are closed. Thus, the operation of the industrial machine can be stopped urgently by turning off the power supply to the industrial machine in the open state. As described above, the switch contacts 32 are connected in series to the control device 2, and the switch contacts 33 are also connected in series to the control device 2, so that the cables connected to the switch contacts 32 and 33 are connected. 9a and 9b are duplicated between the portable operation panel 3 and the control device 2 to increase the reliability of the emergency stop function. That is, even if one of the switch contacts is welded, the industrial machine can be emergency stopped by changing the other switch contact to the open state.
[0021]
Further, as shown in FIG. 2, the first and second switch contacts 32 and 33 are also connected to the mismatch detection circuit 25, respectively. The mismatch detecting circuit 25 determines whether or not the contact states of these two contacts match, and transmits a signal indicating the mismatch to the internal processing circuit 26 when the mismatch is detected.
[0022]
The third switch contact 34 is connected to a detection circuit 36 provided in an internal processing circuit 35 of the portable operation panel 3. For example, the switch contact is also in a closed state when the operation button 31a is not pressed, and the switch contact is in an open state when the operation button 31a is pressed. It becomes. The detection circuit 36 is configured to detect the pressing operation of the operation button 31a by monitoring the open / closed state of the switch contact 34.
[0023]
The internal processing circuit 35 includes, for example, a microcomputer and other circuit elements, has a function of the detection circuit 36, and performs internal processing such as display processing on the LCD 30 and performs data communication with the control device 2. Is configured.
[0024]
The communication circuit 37 transmits a signal input from the internal processing circuit 35 to the control device 2 via the communication cable 9c, and provides a signal input from the control device 2 to the internal processing circuit 35.
[0025]
On the other hand, the emergency push button switch 22 in the control device 2 has a two-contact configuration including switch contacts 23 and 24. However, the contact configuration of the emergency push button switch 22 may be a contact configuration of three or more contacts as described later.
[0026]
In the emergency push button switch 22, the switch contact 23 is inserted in series between the switch contact 32 and the mismatch detection circuit 25, and the switch contact 24 is connected in series between the switch contact 33 and the mismatch detection circuit 25. Is inserted.
[0027]
The inconsistency detection circuit 25 monitors the contact state of the two contacts wired in duplicate, and when the logic of the two contacts becomes inconsistent when the industrial machine is stopped (that is, when one of the contacts is open and the other is closed). In step (1), it is determined that a defective state such as a cable break has occurred, and the fact is transmitted to the internal processing circuit 26.
[0028]
Similarly to the internal processing circuit 35 of the portable operation panel 3, the internal processing circuit 26 includes a microcomputer and other circuit elements, and performs data communication with the internal processing circuit 35 of the portable operation panel 3. Is configured. The internal processing circuit 26 operates as a sub-circuit even after the industrial machine is stopped, sends information indicating that the industrial machine has been stopped to the portable operation panel 3, and detects a faulty state in the mismatch detection circuit 25. When it is detected, the information about the defective state is sent to the portable operation panel 3. Further, the internal processing circuit 26 has a function of analyzing the cause of the stoppage of the industrial machine based on the detection result of the mismatch detection circuit 25, information input from the portable operation panel 3, and the like.
[0029]
The communication circuit 27 sends a signal input from the internal processing circuit 26 to the portable operation panel 3 via the communication cable 9c, and gives a signal input from the portable operation panel 3 to the internal processing circuit 26. It is.
[0030]
In the above configuration, when the operation button 31a of the emergency push button switch 31 on the portable operation panel 3 is pushed, the first to third switch contacts 32 provided on the emergency push button switch 31, 33 and 34 simultaneously change from the closed state to the open state. In response to this, in the control device 2, the main circuit connected to the first and second switch contacts 32, 33 is cut off, and the industrial machine is stopped emergency.
[0031]
In the portable operation panel 3, the detection circuit 36 detects that the operation button 31a is pressed in response to the change of the third switch contact 34 to the open state. Thus, when the operation button 31a is pressed, the internal processing circuit 35 can immediately detect the operation and notify the creator of the fact. Specifically, by displaying on the LCD 30 that the operation button 31a has been pressed, the operator can be notified of that fact. However, the present invention is not limited to this, and other notification modes such as generation of an alarm may be adopted.
[0032]
In addition, when receiving a signal indicating that the industrial machine has stopped from the control device 2, the internal processing circuit 35 causes the LCD 30 to display information on the presence or absence of the pressing operation of the operation button 31 a based on the detection result of the detection circuit 36. For example, when a signal indicating that the industrial machine has stopped is received from the control device 2 without pressing the operation button 31a, the operation of pressing the operation button 31a is performed based on the detection result of the detection circuit 36. Is displayed on the LCD 30, and the operator is notified of the fact.
[0033]
Therefore, the operator using the portable operation panel 3 can immediately determine whether or not the user has operated the button by visually recognizing the LCD 30 when the industrial machine is in an emergency stop. When the emergency push button switch 31 of the portable operation panel 3 is not operated, it can be grasped that the industrial machine has stopped due to the depression of another emergency push button switch.
[0034]
Further, the internal processing circuit 35 transmits the detection result of the detection circuit 36 to the control device 2 when the operation button 31a is pressed and when a signal indicating that the emergency stop has been received from the industrial machine. Is configured.
[0035]
In the control device 2, the internal processing circuit 26 inputs the detection result of the mismatch detection circuit 25 and acquires information on the presence or absence of the pressing operation of the operation button 31 a input from the portable operation panel 3. If the contact states of the two contacts match (that is, both are open) and the emergency push button switch 31 of the portable operation panel 3 is not pressed, the emergency push of the control device 2 is performed. It is determined that the button switch 22 has been depressed, and information indicating the depression is transmitted to the portable operation panel 3. If the contact states of the two contacts do not match, information indicating a defective state such as a broken cable is sent to the portable operation panel 3.
[0036]
Thereby, the operator using the portable operation panel 3 can easily specify the cause of the emergency stop of the industrial machine.
[0037]
Also, the internal processing circuit 26 of the control device 2 pushes the emergency push button switch 22 when the emergency push button switch 22 provided in the control device 2 is composed of three or more contacts having monitoring contacts. In the case of detecting the presence or absence of the operation, the cause of the emergency stop can be grasped in more detail.
[0038]
That is, (1) If the emergency push button switches 31 and 22 of both the portable operation panel 3 and the control device 2 are not pushed and the contact states of the two contacts coincide, the duplicated cable 9a , 9b are disconnected, and (2) the emergency push button switches 31 and 22 of both the portable operation panel 3 and the control device 2 are not depressed, and the contact states of the two contacts do not match. In the case of (1), one of the duplicated cables 9a and 9b is disconnected. (3) If the emergency push button switch 31 on the portable operation panel 3 is pushed in and the contact states of the two contacts do not match, One of the first and second switch contacts 32, 33 of the emergency push button switch 31 is in a welded state. (4) The emergency push button switch 22 in the control device 2 is Is then included operation, if the contact state of the two contacts of the mismatch, a state in which one of the switch contacts of the button switch 22 push the emergency is welded, it can be satisfactorily detect all fault conditions that. Further, when a plurality of emergency push button switches are provided in the industrial machine system 1, it is possible to easily specify which emergency push button switch has been pressed.
[0039]
As described above, the portable operation panel 3 of the present embodiment is provided with the emergency push button switch 31 for stopping the industrial machine in an emergency. On the other hand, the opening and closing operations of the first and second switch contacts 32 and 33 connected in series are performed in conjunction with the pressing operation of the operation button 31a, and the third switch contact 34 connected to the internal processing circuit 35. The opening and closing operation is performed in conjunction with the pressing operation of the operation button 31a. The internal processing circuit 35 of the portable operation panel 3 is configured to detect the presence or absence of the pressing operation of the operation button 31a by monitoring the open / close state of the third switch contact 34. When an emergency stop occurs, the cause can be quickly grasped.
[0040]
In particular, by providing an emergency push button switch 31 having three or more contacts on the portable operation panel 3 connected to the control device 2 by the cable 9, the portable operation panel 3 can be operated by the time the feedback signal from the control device 2 is input. The presence or absence of a pressing operation on the operation button 31a on the board 3 can be determined at an early stage.
[0041]
However, when a plurality of operation panels are arranged not only in the portable operation panel 3 but in the industrial machine system 1, each of the operation panels is configured as described above, so that in the industrial machine system 1, It is possible to more accurately identify the cause of the emergency stop.
[0042]
Further, since the presence or absence of the pressing operation of the operation button 31a can be detected as described above, more information can be notified to the worker than before, so that when the industrial machine is stopped, the worker can quickly and appropriately perform the operation. Measures can be taken.
[0043]
Further, when the internal processing circuit 35 detects the pressing operation of the operation button 31a, the detection result is displayed on the LCD 30. Can understand.
[0044]
Further, the internal processing circuit 35 is configured so as to be able to perform data communication with the control device 2, and sends information regarding the presence or absence of a pushing operation based on the open / close state of the third switch contact 34 to the control device 2. With this configuration, the cause of the emergency stop can be specified in the control device 2 in more detail.
[0045]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described contents.
[0046]
For example, in the above-described embodiment, for convenience, the case where the switch contact provided to the emergency push button switch 31 has a three-contact configuration is illustrated, but the present invention is not limited to this, and a configuration having three or more contacts may be used.
[0047]
【The invention's effect】
As described above, according to the first aspect of the present invention, the first and second emergency pushbutton switches are respectively connected in series to the control device for emergency stop of the industrial machine. It is configured that the opening and closing operation of the switch contact is performed in conjunction with the pressing operation of the operation button, and the opening and closing operation of the third switch contact connected to the internal processing circuit is performed in conjunction with the pressing operation of the operation button. Since the processing circuit is configured to detect the pressing operation of the operation button by monitoring the open / close state of the third switch contact, the cause of the emergency stop of the industrial machine can be quickly grasped. Can be.
[0048]
According to the second aspect of the present invention, when a pressing operation of the operation button is detected, the fact is displayed on the display means. The cause can be identified. Further, when a signal indicating that the industrial machine has stopped is received from the control device, information regarding the presence or absence of the pressing operation of the operation button is displayed on the display means based on the detection result of the pressing operation. It is possible to know whether the button switch has been pressed or another emergency push button switch has been pressed.
[0049]
Further, according to the third aspect of the present invention, since the information on the presence or absence of the pushing operation based on the open / close state of the third switch contact is configured to be sent to the control device, the control device also has an emergency. The cause of the outage can be specified in detail.
[Brief description of the drawings]
FIG. 1 is an external view illustrating a configuration example of an industrial machine system.
FIG. 2 is a functional block diagram showing an internal configuration of the industrial machine system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Industrial machine system 2 Control device 3 Portable operation panel (operation panel)
9 Cable 21 Operation panel 30 Liquid crystal display (display means)
31 emergency push button switch 31a operation button 32 switch contact (first switch contact)
33 switch contact (second switch contact)
34 switch contact (third switch contact)
35 internal processing circuit 36 detection circuit

Claims (3)

An operation panel connected to a control device of the industrial machine, for remotely controlling the industrial machine,
An internal processing circuit that performs internal processing in the operation panel;
In order to perform an emergency stop of the industrial machine, opening and closing operations of first and second switch contacts respectively connected in series to the control device are performed in conjunction with a pressing operation of an operation button, and the internal processing circuit An emergency push button switch that performs an opening and closing operation of a third switch contact connected to the operation button in conjunction with a pressing operation of the operation button,
The operation panel, wherein the internal processing circuit detects a pressing operation of the operation button by monitoring an open / close state of the third switch contact. The operation panel according to claim 1,
Further comprising display means for displaying information,
The internal processing circuit is configured to be capable of data communication with the control device, and when detecting a pressing operation of the operation button, causes the display unit to display the detection result, and the control device controls the industrial machine. An operation panel, wherein, upon receiving a signal indicating that the operation is stopped, information on whether or not the operation button has been pressed is displayed on the display means based on a detection result of the pressing operation. The operation panel according to claim 1 or 2,
The internal processing circuit is configured to be capable of data communication with the control device, and transmits information on the presence or absence of the pushing operation based on an open / close state of the third switch contact to the control device. Operation board.

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