JPH05207569A - Display device - Google Patents

Abstract

PURPOSE:To improve the reliability by preventing mis-display of state indication of a load controlled by a control terminal equipment. CONSTITUTION:A CPU 34 writes a load control signal and a load state signal fetched by a transmission interface 33 to a memory 35. Then the CPU 34 judges whether or not the load state by both the signals are coincident. When they are coincident, display control lighting or extinguishing is applied to a display lamp 311 of a display section 31 corresponding to the load state and when noncoincident, the display lamp 311 is flickered to display abnormality of the load state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring and control system in which a central control unit monitors and controls a plurality of control terminals for driving and controlling loads such as lights, and more particularly to a remote monitoring and control system connected to the transmission path. And a display device for displaying the status of each load.

[0002]

2. Description of the Related Art Conventionally, in a system of this type, as shown in FIG. 4, when a central control unit 1 sends a load control signal to a control terminal unit 2 via a transmission line 5, the control terminal unit 2 sends the load control signal. ON / OFF of the load 21 such as a lamp based on the load control signal
OFF or dimming control is performed. At this time, the sub operation panel (corresponding to the above display device) 3 displays the state of the load 21 of the control terminal 2 on the basis of the load control signal on the transmission path 5 by the display unit 31.
To display. However, due to a failure of the control terminal device 2 or a transmission error when the load control signal is sent from the central processing unit 1 to the control terminal device 2, the state of the load 21 of the control terminal device 2 becomes as instructed by the load control signal. May not be possible. Even in such a case, since the display unit 31 of the sub operation panel 3 displays the state of the load 21 according to the load control signal, the load state display of the sub operation panel 3 and the actual load 2 are displayed.
There is a drawback that the state of 1 does not match.

[0003]

As described above, the control terminal unit controls the state of the load it manages based on the load control signal transmitted from the central control unit. At this time,
Due to a failure of the control terminal or a transmission error of the load control signal, the load state may not be as instructed by the load control signal. In such a case, the display of the display device that displays the state of the load based on the load control signal and the actual state of the load do not match, and an error occurs in the load state display of the display device. There was a flaw.

Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks and to provide a display device capable of preventing erroneous display of the status display of a load controlled by a control terminal and improving its reliability. There is.

[0005]

The control terminal of the present invention controls the state of the load it manages based on the load control signal transmitted from the central control unit via the transmission path, and In a display device for displaying the load state of a remote monitoring control system that returns a response signal indicating a state of a load to the central control unit via the transmission line, a load control signal and a response signal on the transmission line are displayed. In the case where it is determined by the receiving means to be taken in and the judging means for judging whether or not the load states indicated by the both signals taken in by the receiving means coincide with each other, and the judging means judges that the load states indicated by the both signals agree with each other. , A display means for performing a display corresponding to a load state indicated by one of the signals or both signals.

[0006]

In the display device of the present invention, the receiving means takes in the load control signal and the response signal on the transmission line. The judging means judges whether or not the load states indicated by the both signals fetched by the receiving means match. When the determination unit determines that the load states indicated by the both signals match, the display unit performs a display corresponding to the load state indicated by the one signal or both signals.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a display device of the present invention. 3 is a display device such as a sub-operation panel for displaying the state of the load controlled by a control terminal (not shown), 5 is a transmission line for signal transmission connected to the central control device, and 31 is the state of the load. In the display section to display,
Display lamp (LED or the like) 311 and the lamp 311
Has a display interface 312 for driving. Three
Reference numeral 2 is an operation unit for an operator to input various data and instructions to the central control unit, 33 is a transmission interface for transmitting and receiving various signals and the like on the transmission path 5, and 34 is a display control of the display device 3 and the like. A CPU that controls individual control and the control of the entire apparatus, 35 is a memory such as a RAM for reading / writing data necessary for the CPU 34 to operate, and 36 is a CP
It is a ROM in which programs and data for controlling the U34 are stored.

Next, the operation of this embodiment will be described. In the remote monitoring control system having the display device 3 shown in FIG. 1, when the control terminal (not shown) controls the load condition by the load control signal sent from the central control device onto the transmission path 5, It is assumed that the control terminal adopts a method of answering the control result as a load state signal to the central control unit 1 via the transmission line 5. Therefore, the CPU 34 of the display device 3 shown in FIG. 1 can take in the load control signal and the load status signal on the transmission line 5 by the transmission interface 33, and using both of these signals, the load control signal and the load state signal can be read as described below. Control can be performed to display the status.

FIG. 2 is a flow chart showing an embodiment of the load state display control of the CPU 34. When the central controller sends a load control signal to the control terminal via the transmission line 5, the transmission interface 33 of the display device 3 shown in FIG. 1 takes in the load control signal. Further, when the control terminal unit controls the load state according to the load control signal, the control terminal unit sends back a load state signal indicating the load state to the central control unit via the transmission line 5, so that the transmission interface 33 of the display device 3 is provided. Takes in the load status signal on the transmission line 5. For this reason, the CPU 34 of the display device 3 operates as shown in FIG.
The processing of step 201 shown in FIG. That is, in step 201, it is judged whether or not the taken-in signal is the load control signal, and if it is the load control signal, the process proceeds to step 203 to write the taken-in load control signal in a predetermined area of the memory 35.

On the other hand, when it is determined in step 201 that the signal is not the load control signal, the CPU 34 proceeds to step 202 and determines whether or not the captured signal is a load state signal, and if so, step 204. Otherwise go to step 205. In step 204, the CPU 34 writes the load state signal taken in by the transmission interface 33 into a predetermined area of the memory 35, and then proceeds to step 207. In step 207, it is determined whether to use both the load control signal and the load state signal for display control, or to use either one of these signals, and when one is used, the process proceeds to step 210,
Otherwise, go to step 208. Here, the operator selects whether to use both the load control signal and the load state signal or one of them as an information source for displaying the load state of the display device 3, and preliminarily operates the operation unit 32. The CPU 34 sets the selection result in the CPU 34. As a result, the CPU 34 writes data indicating what is used as a display information source in a predetermined area of the memory 35. If you proceed to step 210, CP
U34 reads an information source written in the predetermined area of the memory 35, for example, a load control signal (or one of the load state signals) from the memory 35 and creates a display control signal based on the information. After sending this to the display interface 312, the process returns to step 201. The display interface 312 controls lighting or extinguishing of the lamp 311 indicating the state of each load of the control terminal based on the display control signal sent from the CPU 34, and displays the state of the load.

If it is determined in step 207 that both of the above information are used for display control, step 20
8, the CPU 34 determines whether the load state of the control terminal indicated by the load control signal written in the memory 35 matches the load state of the control terminal indicated by the load state signal. Is determined, and if they do not match, step 2
11, the process proceeds to step 209 if they match. When the process proceeds to step 211, the CPU 34 creates a signal indicating an abnormality in the load state and displays it on the display interface 3
After outputting to 12, the process returns to step 201. When the display interface 312 receives the load state abnormality display signal, the display interface 312 causes the lamp 311 to flicker based on the load state abnormality display signal and displays the abnormality display. On the other hand, if the process proceeds to step 209, the CPU 34 creates a display control signal indicating the load state based on the load control signal or the load state signal, outputs this to the display interface 312, and then returns to step 201. The display interface 312 controls lighting or extinguishing of the display lamp 311 based on the input display control signal to display the state of the load. by the way,
If the process proceeds from step 202 to step 205, CP
U34 determines whether or not an operation signal is input from the operation unit 32, and if not input, returns to step 201, and if input, creates a transmission signal according to the operation signal in step 206, and outputs this. After sending out from the transmission interface 33 onto the transmission path 35, the process returns to step 201.
It is assumed that the operator has previously set the information of the signal to be used in the memory 35 from the operation unit 32 via the CPU 34 to determine which signal is used to display the load state in step 207.

According to this embodiment, only when the load states indicated by both the load control signal and the load state signal match, the load state is displayed on the display section 31 based on any one of the signals, In addition, if the two signals do not match due to a load control signal transmission error, a control terminal failure, etc., an abnormal display of the load status is displayed, so that an erroneous display of the load status can be prevented and the reliability of the device is improved. It can be significantly improved. Depending on the case, the load status can be displayed by using either the load control signal or the load status signal, which is applicable to a system without a load status signal and maintains the flexibility of the device. can do.

FIG. 3 is a flow chart showing another embodiment of the display control of the CPU 34. The CPU 34 determines in step 301 whether or not the signal captured by the transmission interface 33 is a load control signal. If the signal is a load control signal, the CPU 34 proceeds to step 303 and stores the captured load control signal in a predetermined memory 35. Write in the area.
On the other hand, if it is determined in step 301 that the signal is not the load control signal, the CPU 34 proceeds to step 302, determines whether or not the captured signal is a load state signal, and if so, proceeds to step 304, Otherwise, go to step 305. In step 304, the CPU 34
Compares the load state indicated by the load state signal fetched by the transmission interface 33 with the load state indicated by the load control signal written in the memory 35, determines whether or not they match, and if they do not match, Proceed to step 307, and if they match, proceed to step 308. Step 3
When the process proceeds to 07, the CPU 34 creates a signal indicating an abnormal load state, outputs the signal to the display interface 312, and then returns to step 301. When the display interface 312 receives the load state abnormality display signal, the display interface 312 flicker-drives the display lamp 311 to display the abnormality. On the other hand, if the process proceeds to step 308,
The CPU 34 creates a display signal indicating the load state based on the load control signal or the load state signal, outputs this to the display interface 312, and then returns to step 301.
The display interface 312 controls lighting or extinguishing of the display lamp 311 based on the input display control signal to display the state of the load.

In this embodiment, since the load state is always displayed only when the load control signal and the load state signal match, the display control of the CPU 34 can be simplified and the capacity of the memory 35 can be reduced. Similar to the previous embodiment, the display accuracy of the load state can be improved.

[0015]

As described above, according to the display device of the present invention, it is possible to prevent erroneous display of the status display of the load controlled by the control terminal device and improve its reliability.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing an example of a state display control process of the CPU shown in FIG.

FIG. 3 is a flowchart showing another embodiment of the state display control processing of the CPU shown in FIG.

FIG. 4 is a block diagram showing an example of a conventional remote monitoring control system.

[Explanation of symbols]

3 ... Display device 31 ... Display unit 32 ... Operation unit 33 ... Transmission interface 34 ... CPU 36 ... ROM

Claims (2)

[Claims] 1. The control terminal controls the state of the load managed by itself based on the load control signal transmitted from the central control unit via the transmission line, and then shows the state of the load as the control result. In a display device for displaying the load condition of a remote monitoring and control system that returns a response signal to the central control unit via the transmission line, a receiving means for receiving the load control signal and the response signal on the transmission line, and the receiving means. When the determination means determines whether or not the load states indicated by the both signals captured by the means match, and the determination means determines that the load states indicated by the both signals match, either one of the signals Alternatively, a display device is provided with a display unit that performs a display corresponding to a load state indicated by both signals. 2. The display device, wherein the display means displays an abnormality when the determination means determines that the load states indicated by the both signals do not match.