JP3239069B2 - Display unit and centralized monitoring system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display unit for a monitoring panel, and more particularly, to a display unit capable of displaying a failure and changing a display pattern by a CPU mounted thereon.

[0002]

2. Description of the Related Art In order to monitor and control the state of equipment in a plant from a distance, sensor information of each equipment is taken in via an input / output device (PI / O) and selected by a programmable controller (hereinafter referred to as a controller). The monitoring information is sent to the monitoring panel, and the corresponding display is turned on / off.

[0003] A failure of the display on the monitoring panel may cause an operator to make an erroneous decision. Therefore, the status signal of the equipment is divided into two signals, "ON" and "OFF", and each of them is provided with a different display. There is a surveillance system that is displayed with a symbol to improve reliability. However, in addition to the increase in the number of wires, there is a physical limitation on information that can be input to and output from the controller.

[0004] In general, a large number of indicators are mounted on a monitor panel for displaying faults and status, and a number of wires are complicatedly connected between the indicators and the controller. For this reason, a check for the presence / absence of a failure in the display is performed manually using a display lighting test device (lamp test).

[0005]

In the conventional lamp test, an operator checks whether the display is turned on or off in response to the on / off of an input signal. I can't even identify. Also, because of the offline test, early detection of a failure is not possible. Furthermore, even for the same type of display, there is a problem that the maintainability is poor because the wiring connection differs depending on the display pattern.

SUMMARY OF THE INVENTION In view of the problems of the prior art, an object of the present invention is to provide a display unit having a processing function of changing a display pattern without changing a wiring, fixing a wiring and enabling standardization of the unit, and a transmission line. It is an object of the present invention to provide a monitoring system that facilitates the use of a bus.

Another object of the present invention is to provide a display unit having a self-diagnosis function and a centralized monitoring system capable of online monitoring a failure of an individual display on a monitoring panel by the display unit.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display unit which includes a plurality of indicators and displays the operating state or failure state of the corresponding device by a combination pattern of lighting and turning off. Transmission means for transmitting / receiving to / from the issuing upper layer, storage means for storing the instruction content of the lighting command and the lighting pattern, etc., and converting the instruction content into display information corresponding to each of the displays based on the stored lighting pattern. This is achieved by providing a CPU that performs the processing.

In the above, the present invention is attained by forming the transmission means, the storage means, and the CPU as a collective unit and connecting them to a plurality of display units with standard cables.

Further, the CPU compares the display information with the lighting state of the plurality of displays, and outputs an abnormal signal when the display information does not match.

An object of the present invention is to provide a centralized monitoring system such as a plant device having a controller and a monitoring panel on which a plurality of display units are mounted. And a plurality of indicators for pattern display of a failure state, a transmission unit for transmitting and receiving the controller and the serial transmission, a storage unit for storing the content of a lighting instruction and a lighting pattern of the controller, and a lighting pattern for storing. A CPU that converts the instruction content into display information associated with each of the display devices based on the instruction is provided, and changing the lighting pattern is achieved by receiving a change instruction or a change pattern from the controller.

Further, the CPU compares the display information with the lighting states of the plurality of displays, and instructs the transmission means to transmit an abnormal signal when the display information does not match, and at this time, the transmission means performs another access. Transmitting the abnormal signal to the controller in priority to the controller.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram of a centralized monitoring system according to an embodiment. A programmable controller (hereinafter, referred to as a controller) 1 is connected to an LED display unit 4, 5, 6,. . . To send and receive. Note that an input / output device (I / O) may be provided between the controller 1 and the monitoring panel 3.

The LED display unit 4 of this embodiment is of a type with a switch, and includes a CPU 4a, a transmission device 4b, a memory 4
c, LEDs 4da to 4dd and a switch 4de. The LEDs 4 da to 4 dd display the status of the plant equipment sent to the controller 1. In addition, LED4
Da to 4dd are formed integrally with the drive circuit as shown in FIG.

The LED display units 5 and 6 have basically the same configuration, although there is a difference in the presence or absence of a switch depending on the application. Hereinafter, the LED display unit 4 with a switch will be described.

When the operator turns on / off the switch 4de on the monitoring panel, the transmission device 4b transmits the status information to the controller 1. Then, an LED lighting instruction corresponding to the state information from the controller 1 is received. The memory 4c stores lighting commands, status information, lighting patterns, and CPU
The execution program of “a” is stored in a predetermined area.

The CPU 4a reads the memory 4c and sends a lighting instruction from the controller 1 to the LE based on the lighting pattern.
The information is converted into D display information, and the LEDs 4da to 4dd are displayed. In addition, it periodically checks whether the LEDs 4da to 4dd are turned on as instructed to turn on, and if there is an abnormality, instructs transmission of an abnormality detection signal.

In this embodiment, the switch 4de is a push button type, and the pushed information is stored in the memory 4c. The transmission device 4a transmits the information to the controller 1 at its own timing. At this time, if there is a transmission instruction from the CPU 4a based on the abnormality detection of the LED display unit 4, transmission of the abnormality detection information is prioritized. The result of comparison between the contents of the memory 4c and the state of the switch 4de is added to the abnormality detection signal in addition to the LED mismatch state.

FIG. 2 is a processing flowchart showing the operation of the LED display unit with a switch. CPU 4a is LE
The state of D4da to LED4dd is captured (S21),
This is compared with the LED display information based on the lighting instruction stored in the memory 4c, and a check is made to see if they match (S
22). If they do not match, the contents of the abnormality are written to the transmission data area of the memory 4c (S23), a transmission command of an abnormality detection signal is issued to the transmission device 4b, and the abnormality detection signal is transmitted from the transmission device 4b to the controller 1 (S24). ).

Next, it is determined whether there is access from a higher order (S25), and if there is no access, the process returns to step S21. If there is an access from a higher order, that is, if a lighting instruction from the controller 1 is written in the input data area of the memory 4c via the transmission device 4b, the lighting instruction data is read out (S26), and the data is stored in the memory 4c. While referring to the stored lighting pattern, the lighting instruction data is converted into LED display information and stored in the display area of the memory 4c (S2).
7). The LED display information is L from the display area of the memory 4c.
LED4da to LED4d applied to the drive circuit of the ED
d is lit in the lighting pattern as instructed (S28). If the content of the lighting instruction is off, the pattern conversion is omitted and the LEDs 4da to 4dd are turned off.

FIG. 3 is a block diagram for explaining the function of selecting the lighting pattern of the LED unit. The lighting instruction data a to d from the controller 1 received by the transmission device 4b of the LED display unit 4 are stored in the reception data area 4 of the memory 4c.
The input is stored in the order of input a to input d of ca. The lighting pattern conversion program storage area 4cb stores a program executed by the CPU 4a. The display data area 4cc stores the display a to d in order, and the LED 4d
a to LED4dd are output to the drive circuits.

The controller 1 transmits a lighting pattern instruction to the LED display unit at the time of starting or when a change is necessary. Upon receiving the lighting pattern instruction, the CPU 4a executes the lighting pattern conversion program while referring to the lighting pattern storage area 4cc, and executes the input a of the reception data area 4ca.
The input d is associated with the display ad of the display data area 4cc. That is, a soft connection between the two is determined. LE
After the lighting pattern of the D display unit 4 is determined, C
PU4a displays each data of input a to input d corresponding to display a
To d, thereby converting the LED display information.

FIG. 3B shows an example of a lighting pattern. This is a three-partition pattern that indicates the selection or failure of a device in the upper two, and the state of the device in the lower one. That is,
The stop of the device corresponding to the LED display unit 4 is the LED 4
The green light of dc and the operation of the device perform red light of the LED 4db. In addition, for the selection of a device to be turned on / off or a failure, the LED 4da or the LED 4dd blinks orange. In addition to this, all lights indicating the overall mode,
There are various lighting patterns such as two divisions indicating automatic / manual and four divisions indicating the device No. In this embodiment, these lighting patterns can be realized without changing wiring.

FIG. 4 shows a mounting structure of the LED display unit. The transmission device 4b,
The display circuit 4f of the CPU 4a and the LED 4d is formed by one chip. A lamp holder 51 having a display window 52 is formed at an upper part of the main body 50, and an LED lamp 4d is mounted. At the lower part of the main body 50, a connector 53 having a plurality of pins (four in this example) for power and signals is mounted. In this example, the main body 50 is provided with the voltage regulator 5.
4 to stabilize the display brightness of the LED by correcting the voltage drop.

According to the present embodiment, all the wires of the LED display unit can be unified to four wires (two power sources + two signals), so that the unit can be standardized and the number of wiring steps and parts steps can be greatly reduced. .

FIG. 5 shows another embodiment of the LED display unit, which is an embodiment of a collective circuit unit. The collective circuit unit 40 includes a transmission circuit 41, a CPU 42, an output photocoupler circuit 43, a multi-core cable 45 connected to a connector 44 and a connector 46, and LED indicators 47 and 48. Since the number of cores of the multi-core cable 45 is fixed regardless of the lighting pattern, the collective circuit unit 40 and each LED
Only one standard cable is required between the lamp holders, and the wiring of the panel can be simplified.

Collective circuit unit 4 from controller 1
The lighting instruction to “0” is serially transmitted via the serial transmission line 2. Upon receiving this lighting instruction, the transmission circuit 41 stores the data a to d in the reception data area for the display 47 and the data e to h in the reception data area for the display 48 (memory is not shown). There). CPU42
Converts the data a to d into LED display information based on the lighting pattern of the LED display 47, and outputs data e to h
Is converted into LED display information based on the lighting pattern of the LED display 48, and the LED display 4 is output via each output photocoupler circuit 43 via the multi-core cable 45.
7 and 48.

The abnormality is detected in the collective circuit unit 40 in the order of the LED display 47 and the LED display 48. If there is an abnormality, the data a to d and the data e to
An abnormal state is transmitted to the controller 1 in association with the data of h. Thereby, the controller 1 can recognize which LED lamp of which collective unit has a failure. When there is no response from the LED display unit 4 to the command of the controller, the controller 1 recognizes that the transmission unit of the display unit has an abnormality.

According to this embodiment, the LED display units that can be blocked on the monitoring panel 3 can be combined into a collective unit, so that the transmission load with the controller 1 can be reduced. In addition, the number of processing chips for transmission and abnormality diagnosis can be significantly reduced.

[0030]

According to the present invention, the display unit is provided with the transmission function and the display pattern changing function, so that the display unit type can be unified, and the mounting and maintenance of the monitoring panel by standardizing the unit is facilitated. . In addition, since the number of input / output points of signals becomes constant by standardization, serial transmission by a bus between controllers can be easily realized.

Further, since the display units that can be blocked are formed as a unit, the number of wiring steps and the number of component steps can be significantly reduced.

Further, since the display unit is provided with a self-diagnosis function and performs on-line monitoring, the controller can detect in real time which display unit on the panel has a failure, thereby preventing the operator from erroneously operating the system. Reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a centralized monitoring system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the LED display unit according to one embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a function of changing a lighting pattern of an LED display unit.

FIG. 4 is an explanatory view showing a mounting structure of the LED display unit according to one embodiment.

FIG. 5 is a configuration diagram showing a collective unit according to another embodiment.

[Explanation of symbols]

1. Controller, 2. Serial transmission path, 3. Monitoring panel,
4, 5, 6: LED display unit, 4a: CPU, 4b
... Transmission device, 4c ... Memory, 4Ca ... Reception data area, 4cb ... Lighting pattern conversion program storage area,
4cc: display data area, 4cd: lighting pattern storage area, 4da to 4dd: LDE (display), 4de ...
Switch, 4f display circuit, 40 collective circuit unit,
41: Transmission circuit, 42: CPU, 43: Output photocoupler circuit, 44, 46: Connector, 45: Multi-core cable, 47, 48: LED display, 50: LED display unit main body, 51: Lamp holder, 52 ... Display window, 53 ...
Connector, 54 ... Voltage regulator.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeo Kasai 5-2-1 Omikacho, Hitachi City, Ibaraki Prefecture Inside the Omika Plant, Hitachi, Ltd. (72) Inventor Masahiro Takeshita 5-chome Omikacho, Hitachi City, Ibaraki Prefecture No. 1 Hitachi, Ltd. Omika Plant (72) Inventor Mikio Yoda 5-2-1 Omikacho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. Omika Plant (72) Inventor Nagao Kanazawa Omikacho, Hitachi City, Ibaraki Prefecture 2-1 Hitachi, Ltd. Omika Plant (72) Inventor Shosei Mochizuki 1-12-2 Kawana, Fujisawa-shi, Kanagawa Yamatake-Honeywell Co., Ltd. (56) References JP-A-7-105452 (JP, A) JP-A-6-95599 (JP, A) JP-A-6-266974 (JP, A) JP-A-62-288892 (JP, A) (58) Field (Int. Cl. ⁷ , DB name) G08B 5/00 G05B 23/02 G08B 23/00 510

Claims (7)

(57) [Claims] 1. A display unit comprising a plurality of indicators and displaying an operating state or a failure state of a corresponding device according to a combination pattern of lighting and extinguishing thereof. Storage means for storing the instruction content of the command, the lighting pattern, etc.,
CPU for converting the instruction content into display information associated with each of the display devices based on the stored lighting pattern
A display unit comprising: 2. A display unit comprising a plurality of display units and displaying the operating state or the failure state of the corresponding device by a combination pattern of lighting and extinguishing, and issues a lighting instruction to the plurality of display units collectively. Transmission means for transmitting and receiving to and from the host, storage means for storing the instruction content and the lighting pattern of the lighting command for each display unit,
C that generates display information of each display unit based on the stored lighting pattern for each display unit and the instruction content
A display unit, comprising: an aggregate unit having a PU; wherein each display unit and the aggregate unit are connected by signal lines having the same number of lines. 3. The display unit according to claim 1, wherein the CPU compares the display information with a lighting state of the plurality of displays, and outputs an abnormal signal when the display information does not match. 4. The display according to claim 3, wherein the display unit is configured as a display unit with a switch having a built-in switch, and the CPU adds an on / off state of the switch to the abnormality signal. unit. 5. The display unit according to claim 1, wherein the display uses an LED. 6. A centralized monitoring system such as a plant device including a controller and a monitoring panel on which a plurality of display units are mounted, wherein the display unit combines lighting and extinction to determine an operating state and a failure state of a corresponding device. A plurality of displays for displaying patterns, transmission means for transmitting and receiving to and from the controller by serial transmission, storage means for storing the contents of lighting instructions and lighting patterns of the controller, and the instruction based on the stored lighting patterns A centralized monitoring system, comprising: a CPU for converting the content into display information associated with each of the display devices; and when changing the lighting pattern, receiving a change instruction or a change pattern from the controller. 7. The CPU according to claim 6, wherein the CPU compares the display information with a lighting state of the plurality of indicators, and instructs the transmission unit to transmit an abnormal signal when the display information does not match, and at this time, transmits the transmission signal. A centralized monitoring system, wherein the means transmits the abnormality signal to the controller prior to other accesses.