JP2000267702A - Information processing system - Google Patents

Abstract

(57) Abstract: At the same time, signals are transmitted and received between either a programmable logic controller or a computer and an explosion-proof operation display device. An information processing system includes a PLC for controlling facility equipment, a computer, and a video output converter for converting a display video signal of the computer into a format suitable for long-distance transmission and transmitting the format on a video signal line.
1 and an explosion-proof operation display device 100. The explosion-proof operation display device 100 controls the display of the display panel 7 in response to the operation of the touch operation member 3, and
An information processing unit 10 for transmitting / receiving signals to / from, an intrinsically safe holder 91, a video input converter 111 for receiving a video signal on a video signal line and restoring the original video signal, and a video input converter 111 Signal obtained by the above or information processing unit 1
A video signal changeover switch 12 for switching any one of the signals input to 0 and outputting the signal to the display panel 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing system having an explosion-proof operation display device.

[0002]

2. Description of the Related Art Conventionally, for example, in a production factory in which process control is performed by computer operation, information on the state of the plant is collected in a diversified control room, and the collected information is analyzed and totaled. In such a case, an optimum operating condition based on a production plan is found, and control is performed according to the obtained operating condition.

[0003] There are non-explosion-proof and explosion-proof man-machine interfaces used in such production plants.
CRT (cathode-ray tube) as non-explosion-proof type
A display or a liquid crystal display provided with a touch panel type switch is frequently used. On the other hand, as an explosion-proof type, an operation display device described in, for example, JP-A-6-295637 is known.

Explosion-proof types include, for example, hazardous locations where flammable gas is generated, such as petrochemical plants, crude oil mines, gasoline refueling and propane gas supply facilities, tankers, and dust explosions at coal mines and metal crushing sites. It is used in dangerous places where there is a danger.

The structure of the explosion-proof operation display device described in the above-mentioned Japanese Patent Application Laid-Open No. 6-295637 is as shown in FIG.
The case lid 22 is provided with an opening window 22A. A transparent touch operation member 23 is provided in the opening window 22A.
And a light-transmitting plate 24 having pressure resistance are tightly fixed by a glass pressing member 25, and the display panel 27
Is provided with its display surface facing the light transmitting plate 24. In the pressure-resistant / explosion-proof case 21, an intrinsically safe cage 26 is provided.
The position signal output in response to the operation of the touch operation member 23 is output to the display panel 27 via the signal line 28 and the intrinsically safe holder 26. Programmable logic controller (PLC) for controlling an external device, for example, a manufacturing facility
) And this explosion-proof operation display device,
The processing is performed via a cable 29 using an arithmetic processing device and a storage device built in the display panel 27.

[0006]

The explosion-proof operation display device generates heat in the pressure-resistant / explosion-proof case 21, for example,
When an arithmetic processing device and a storage device capable of processing large-volume information at high speed are provided, the temperature in the pressure-resistant / explosion-proof case 21 rises to about 50 to 55 ° C., and the arithmetic processing device does not operate at all. That situation occurs.

Accordingly, an object of the present invention is to provide an information processing system capable of solving the above-mentioned problems and simultaneously transmitting and receiving signals between either a programmable logic controller or a computer and an explosion-proof operation display device. To provide.

[0008]

SUMMARY OF THE INVENTION The present invention provides a programmable logic controller for controlling equipment, a computer, and converts a display video signal of the computer into a format suitable for long-distance transmission and transmits it on a video signal line. The transmitting means and an opening window provided in the pressure-resistant explosion-proof case are sealed with a pressure-resistant light-transmitting plate, and a light-transmitting touch operation member is attached to a surface of the light-transmitting plate on the side of the opening window. An explosion-proof operation display device having an optical display means with a display surface facing the inner surface of the explosion-proof case,
The explosion-proof operation display device is a display control unit that performs display control of the optical display unit in response to an operation of a touch operation member, a transmission and reception unit that transmits and receives signals to and from the programmable logic controller, A safety retainer capable of performing intrinsically safe explosion-proof of the touch operation member, a video signal receiving means for receiving a video signal on the video signal line and restoring the original video signal, and a video signal obtained by the video signal receiving means. Switching means for switching any of the signals obtained by the transmission / reception means and outputting the signal to the optical display means.

The present invention further comprises a mouse and a mouse input converting means for receiving a signal on a mouse signal line and converting the signal into a format suitable for the computer. The explosion-proof operation display device comprises a signal from the mouse. And a mouse output conversion means for converting the mouse into a format suitable for long-distance transmission and transmitting the mouse output signal on a mouse signal line. And a retainer.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. This is an example of the information processing system, and the information processing system includes the PLC 42, the computer 31, the interface unit 15, and the explosion-proof operation display device 100.

The PLC 42 is disposed, for example, in an electric room and controls various equipment 41. Computer 3
1 is arranged, for example, in a control room.

The interface unit 15 includes the video output converter 1
51 and a mouse input converter 152. The video output converter 151 converts the display video signal of the computer 31 into a format suitable for long-distance transmission and transmits the video signal on a video signal line. Converts a mouse signal from an RS422 standard signal to an RS232C standard signal and receives a mouse signal on a mouse signal line. As the video signal line and the mouse signal line, a known low-loss cable that minimizes signal attenuation and is not easily affected by external noise is preferable.

The explosion-proof operation display device 100 will be described. 1
Is a pressure-resistant and explosion-proof case, which has a case lid 2 and is formed by die-casting aluminum based on the explosion-proof electric machine / equipment type certification guide. It has. The case lid 2 is provided with an opening window 2A.
, A transparent touch operation member 3 and a light-transmitting plate 4 having pressure resistance are tightly mounted by a glass pressing member 5. The light transmitting plate 4 is made of hard glass having a sufficient thickness to maintain explosion resistance. Reference numeral 7 denotes a display panel, which is mounted with its display surface facing the light transmitting plate 4.

The touch operation member 3 employs a touch sheet system, that is, a system in which a predetermined number of conductors are arranged on two sheets in the X-axis direction and the Y-axis direction, and a position is indicated by a contact point of the conductor touched by a finger. It was done.

Reference numeral 91 denotes an intrinsically safe retainer having a voltage / current limiting function, which is interposed between the information processing unit 10 and the touch operation member 3, and is associated with the touch operation member 3 and the touch operation member 3. In order to prevent a spark from being generated when the wiring is disconnected or short-circuited, the supplied electric energy is suppressed, and is constituted by a plurality of zener diodes, photocouplers, resistors, and the like.

Reference numeral 11 denotes an interface unit having a video input converter 111 and a mouse output converter 112. The video input converter 111 receives a video signal on a video signal line and restores the original video signal. The mouse output converter 112 converts the signal obtained from the mouse 13 via the intrinsically safe holder 92 from a signal of the RS232C standard into a signal of the RS422 standard so that long-distance transmission is possible, and outputs the signal on the mouse signal line. What to send.

Reference numeral 10 denotes an information processing unit which outputs a position signal output in response to the operation of the touch operation member 3 to the display panel 7 via the intrinsically safe holder 91, and
It controls the LC42, and further includes the touch operation member 3
In response to the operation, the switching of the video signal changeover switch 12 is controlled, and either the signal for displaying various information input from the PLC 42 to the information processing unit 10 or the video signal from the video input converter 111 is performed. The display is switched to the display panel 7.

Since this information processing system is configured as described above, it is confirmed by the operator that the operation of the equipment 41 has been started smoothly, and thereafter, the image changeover switch 12 is operated, and the display panel 7 and the image Input converter 1
11 is connected, the explosion-proof operation display device 100 and the computer 31 are connected, and various information on the computer 31 can be accessed, and various information on the computer 31 can be displayed on the display panel 7 in real time. become. On the other hand, the image switch 12
Is operated to connect the display panel 7 to the information processing unit 10, various information input to the information processing unit 10 from the PLC 42 is displayed on the display panel 7. Therefore, the operator who is in the explosion-proof area can grasp the operation status of the equipment 41 and issue an optimal instruction to the PLC.
42.

When the operator operates the mouse 13 while looking at the display panel 7, the explosion-proof operation display device 100 is displayed.
Is transmitted to the computer 31 and is displayed on the display of the computer 31.

In this embodiment, since the intrinsically safe holder 91 is interposed between the information processing section 10 and the touch operation member 3, the touch operation member 3 and the wiring related to the touch operation member 3 are disconnected or short-circuited. Even so, electric energy supplied is suppressed by the intrinsically safe retainer 91, and no spark is generated. In addition, since the intrinsically safe cage 92 is interposed between the mouse 13 and the mouse output converter 112, even if the wiring related to the mouse 13 is disconnected or short-circuited, electric energy supplied is suppressed by the intrinsically safe cage 92. No sparks occur.

Therefore, even if the explosion-proof operation display device 100 is used in an atmosphere where explosion-proof is required, such as the presence of flammable gas, the information processing system can be operated with confidence.

In this embodiment, the pressure-resistant / explosion-proof case 1 is sealed with the case lid 2, and the opening window 2 A of the case lid 2 is provided with the touch operation member 3 and the light-transmitting plate 4 having pressure resistance. Although the example of the explosion-proof operation display device 100 in which is fixedly mounted by the glass pressing member 5 has been described, the explosion-proof operation display device used in such an information processing system can be a fully closed type. It is also possible to use an internal pressure explosion-proof type so as to prevent the explosive gas from entering the inside of the machine by, for example, injecting a nonflammable gas into the inside.

In the present embodiment, an example of the touch-type touch operation member has been described. However, the touch operation member is not limited to this, and the touch-type operation member is opposing in the X direction and the Y direction of the sheet. A predetermined number of light-emitting elements and light-receiving elements may be provided, and a light detector may be connected to each light-receiving element, touched with a finger, light-detected at a place where light is blocked, and the position may be displayed. .

As a touch operation member, a known analog method, that is, a conductive material is applied to two sheets facing up and down with a spacer, and a voltage of, for example, 5 V is applied to the upper sheet in the X-axis direction. A method of applying a voltage of 5 V in the Y-axis direction to the lower sheet with a time lag to display the position by the voltages in the X-axis direction and the Y-axis direction of the contact points of the two sheets touched by a finger. Can also.

Further, in place of such a touch type touch operation member, a known non-touch mouse type, for example, a type adopted in a personal computer, and a rotatable roller incorporated in the mouse is used. A method of directly displaying the movement amounts in the X-axis direction and the Y-axis direction on the display panel may be used.

[0027]

As described above, according to the present invention,
With the configuration described above, signals can be transmitted and received over a long distance in real time between either the programmable logic controller or the computer and the explosion-proof operation display device.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view showing the structure of a conventional explosion-proof operation display device.

[Explanation of symbols]

 Reference Signs List 1 Explosion-proof / explosion-proof case 2 Case lid 2A Opening window 3 Touch operation member 4 Translucent plate 5 Glass holding member 7 Display panel 10 Information processing unit 11 Interface unit 12 Video signal switch 15 Interface unit 31 Computer 41 Facility equipment 42 PLC 91 Essential Safety cage 92 Intrinsically safe cage 100 Explosion-proof operation display device 111 Video input converter 112 Mouse output converter 151 Video output converter 152 Mouse input converter

Claims (2)

[Claims] 1. A programmable logic controller for controlling equipment, a computer, a transmitting means for converting a display video signal of the computer into a format suitable for long-distance transmission and transmitting the video signal on a video signal line, and an explosion-proof case Is sealed with a pressure-resistant light-transmitting plate, and a light-transmitting touch operation member is attached to the surface of the light-transmitting plate on the side of the opening window. An explosion-proof operation display device is provided with an optical display means attached with a display surface facing the surface, and the explosion-proof operation display device performs display control of the optical display means in response to operation of a touch operation member. Display control means, transmitting and receiving means for transmitting and receiving signals to and from the programmable logic controller, a safety retainer capable of intrinsically safe explosion-proof of the touch operation member, Video signal receiving means for receiving a video signal on the video signal line and restoring the original video signal,
An information processing system comprising: switching means for switching either the video signal obtained by the video signal receiving means or the signal obtained by the transmitting / receiving means and outputting the signal to the optical display means. . 2. The explosion-proof operation display device according to claim 1, further comprising: a mouse; and mouse input conversion means for receiving a signal on a mouse signal line and converting the signal into a format suitable for the computer. Mouse output conversion means for converting a signal from the mouse into a format suitable for long-distance transmission and transmitting the signal on a mouse signal line, and interposed between the mouse output conversion means and the mouse, thereby realizing the intrinsically safe explosion-proof of the mouse. An information processing system, comprising: a possible safety retainer.