JP3304157B2 - Display terminal for remote monitoring and control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a remote monitoring and control system having a plurality of terminals connected to a central processing unit via a two-wire signal line in a time division multiple access system. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display terminal of a remote monitoring and control system in which a display corresponding to monitoring data generated by a terminal can be displayed on a terminal different from the terminal generating the monitoring data.

[0002]

2. Description of the Related Art Conventionally, a plurality of operation terminals and control terminals are connected to a signal line by a time division multiple access system, and monitoring data generated by operating a switch with an operation terminal having a switch. A remote monitoring control system is provided in which control data is created based on the control data, and the control data is transmitted to a control terminal connected to the load, so that the operation state of the load corresponds to the operation of the switch. . In the remote monitoring and control system, a display terminal that uses a load as a display element and performs display corresponding to monitoring data is also used.

[0003] The remote monitoring control system is configured as shown in FIG. 6, for example. That is, the central processing unit 31 includes a plurality of operation terminals 32 for monitoring the operation state of the switch SW, and a plurality of control terminals 3 for controlling the load L.
3. A plurality of display terminals 34, which are control terminals using the display element D as a load, are connected via a two-wire signal line Ls. The operation terminal 32, the control terminal 33, and the display terminal 34 are respectively set with individual addresses, and the central processing unit 31 uses the addresses to cause the central processing unit 31 to operate the operation terminal 32, the control terminal 33, The display terminals 34 are individually recognized.

[0004] The central processing unit 31 transmits a signal to the signal line Ls.
A transmission signal Vs having a format as shown in FIGS. 7A and 7B is transmitted. That is, the transmission signal Vs is composed of a start pulse ST indicating the start of signal transmission, a mode data signal MD indicating a signal mode, address data for individually calling the operation terminal device 32, the control terminal device 33, and the display terminal device 34. , An address data signal AD for transmitting a control data signal CD for transmitting control data for controlling the load L and the display element D, a checksum data signal CS for detecting a transmission error,
Operation terminal 32, control terminal 33, display terminal 3
4 is a multipole (± 24 V) time division multiplexed signal consisting of a signal return period WT, which is a time slot for receiving a return signal from No. 4, and data is transmitted by pulse width modulation.

[0005] Each operation terminal 32, each control terminal 3
3. In each display terminal 34, if the address data transmitted by the transmission signal Vs received via the signal line Ls matches the address data set in advance,
The control data is taken in from the transmission signal Vs, and the return data is sent out by short-circuiting the current mode signal (between the signal lines Ls via a suitable low impedance) in synchronization with the signal return period WT of the transmission signal Vs. Signal).

Further, the central processing unit 31 is provided with a dummy signal transmitting means and an interrupt signal processing means. The dummy signal transmitting means sets the mode data signal MD to a dummy mode, and outputs a dummy transmission signal having an empty address not set in the operation terminal device 32, the control terminal device 33, and the display terminal device 34 as address data. Always sent. Further, the interrupt signal processing means, when receiving the interrupt signal Vi as shown in FIG. 7C generated by any of the operation terminals 32, detects the operation terminal 32 which has generated the interrupt signal Vi. Thereafter, the operation terminal 32 is accessed to return the reply data. That is, the dummy signal is always transmitted by the dummy signal transmitting means to the signal line Ls.
To the operation terminal 3 in accordance with the operation of the switch SW.
When the interrupt signal Vi generated from the signal No. 2 is detected in synchronization with the start pulse signal ST of the dummy transmission signal, the transmission signal Vs in which the mode data signal MD is set to the address confirmation mode is transmitted from the central processing unit 31 by the interrupt processing means. . In the address confirmation mode, the operation terminals 32 having a part of the common address are grouped, and the transmission signals Vs are collectively transmitted for each group. When receiving the transmission signal Vs in which the mode data signal MD is in the address confirmation mode, the operation terminal device 32 that has generated the interrupt signal Vi sets the operation terminal device 32 in synchronization with the signal return period WT of the transmission signal Vs. The returned address data is returned as reply data. In this way, the central processing unit 31 operates the operation terminal 3 that has generated the interrupt signal Vi.
By acquiring the address 2 and accessing the operation terminal 32 using the acquired address, the monitoring data corresponding to the operation state of the switch SW connected to the operation terminal 32 is received as return data. .

In the central processing unit 31, an operation terminal 32
Creates control data to be transmitted to the control terminal 33 connected to the load L and the display terminal 34 connected to the display element D, the connection of which is set in advance to the switch SW, based on the monitoring data returned from. Along with
The transmission signal Vs including the control data is transmitted to the signal line Ls, and the control data is transmitted to the corresponding control terminal 33 and display terminal 34 to control the load L.

The operation terminal device 32 can connect up to four independent switches SW, and the control terminal device 33 can connect up to four independent loads L. It is configured. That is, the operation terminal 3 to which the same address data is set
2 and the control terminal device 33, load number data of 2 bits each is further set, and up to four switches SW and loads L can be identified. In the operation terminal device 32, the control terminal device 33, and the display terminal device 34, the transmission signal Vs transmitted through the signal line Ls is full-wave rectified and stabilized, so that a power supply for operating the internal circuit is provided. Is to be obtained. However, a separate power supply is provided for the load L. If a display terminal 34 having the same address data is provided for each control terminal 33, the operating state of each load L and the lighting state of the display element D correspond to each other. Therefore,
If the display terminals 34 corresponding to the respective control terminals 33 are centrally arranged in the monitoring and control panel 35 and the like, the monitoring and control panel in which the state of the load L such as the lighting of the building or the like is provided in one place 35 can be displayed intensively.

The case of the display terminal 34 provided conventionally is relatively small and is fixed to a mounting panel such as a door of the monitoring control panel 35 in a state of being mounted on a dedicated mounting frame. It has become.

[0010]

As described above, since a dedicated mounting frame is required when mounting to a mounting panel, mounting work for mounting on a monitoring control panel or the like is troublesome. Is problematic. SUMMARY OF THE INVENTION An object of the present invention is to provide a display terminal of a remote monitoring and control system that facilitates the work of mounting on a mounting panel.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a time division multiple access system in which a plurality of terminals each having a different address are connected to a central processing unit via a two-wire signal line. The central processing unit individually accesses the terminals by transmitting a transmission signal including address data to the signal line, and monitors the monitoring data from the terminal during a signal return period set in synchronization with the transmission signal. Receives and generates control data based on the monitoring data, and transmits the control data to another terminal that has a preset correspondence with the terminal that generated the monitoring data by address and connected to the terminal. In a display terminal that is used in a remote monitoring and control system that controls the load that is displayed, and that performs display corresponding to monitoring data using the display element as a load ,
Includes a case forming a transparent window which transmits output light from one display element on the front, the power supply to the display element is a signal line
Provided separately from a remote control transformer connected via a power line.
The fed, mounted on the peripheral portion of the front end portion of the case flange portion is formed to protrude from the side surface of the case, to the rear than the flange portion is urged in a direction to protrude from the side surface of the case is formed in the mounting panel A holding projection that protrudes the periphery of the hole between the flange and the flange is provided, and a front inclined surface that is inclined forward and rearward to approach a side surface of the case toward the front and rear, respectively, on the front side and the rear side of the holding projection. A rear inclined surface is formed.

[0012] The case has a size in which a decorative plate used for a wiring device having a size corresponding to three unit dimensions in the standard of the embedded type wiring device is used as a mounting panel and is inserted into an opening of the decorative plate. The light transmitting window may be formed over substantially the entire front surface formed and exposed from the decorative plate .

Further, two sets of electric wire insertion holes for inserting a signal line and a power supply line are respectively provided on the rear surface of the case, and the signal line and the power supply line are respectively inserted in the case between the terminal plate and the lock spring. Quick connection terminals for electrically and mechanically connecting the signal line and the power supply line by being sandwiched are provided, and quick connection terminals for connecting each set of signal lines and quick connection terminals for connecting each set of power supply lines. May be electrically connected to each other.

[0014]

According to the present invention, a flange protruding from the side surface of the case is formed on the periphery of the front end of the case, and is biased in a direction protruding from the side surface of the case rearward of the flange portion to form the mounting panel. Holding projections that clamp the periphery of the mounting hole between the flange and the flange, and the front and rear sides of the holding projections are inclined forward and rearward so as to approach the side of the case, respectively. Surface and a rear inclined surface are formed, and a mounting hole for inserting a rear portion of the case with respect to the mounting panel is formed, and when the case is inserted from the front with respect to the mounting hole, the flange portion is attached to the mounting hole. The case can be fixed to the mounting panel because the holding protrusion and the flange clamp the circumference of the mounting hole. Also, since the mounting projection is formed with a rear inclined surface, when the case is inserted into the mounting hole, the rear inclined surface contacts the peripheral edge of the mounting hole and is pressed toward the side surface of the case. When the front inclined surface reaches the periphery of the mounting hole, the holding protrusion protrudes due to the urging force acting on the holding protrusion.Since it is a simple work of inserting the case into the mounting hole of the mounting panel, using other members It can be easily installed without any additional components. In addition, by having the front inclined surface, even if the thickness dimension of the mounting panel changes, it becomes possible to cope with the range in which the holding projection can advance and retreat with respect to the side surface of the case. In addition, surface emitting devices
A light-transmitting window that transmits output light from the display element
The power supply to the display element is connected to the signal line and the
Separately from a remote control transformer connected via a power line
Is supplied and is relatively large for the display element.
Since power can be supplied, the brightness as a display element
Can be used, and as a result
It can be easier. In addition, surface display
Since an optical element is used, it is approximately uniform over a relatively large area.
Uniform brightness can be obtained.

Further, in the case where the case is formed in a dimension to be inserted into an opening of a decorative plate used for a wiring device having a size corresponding to three unit dimensions in the standard of the embedded wiring device, The decorative plate of the wiring device can be diverted at the time of mounting one by one on a wall surface or the like, and it is not necessary to use a dedicated mounting member, and it is possible to suppress an increase in cost by using a ready-made member. In addition, the appearance after the construction can be unified with the existing wiring equipment and the design is good, and the translucent window is formed over almost the entire front surface exposed from the decorative plate. Thus, the display surface can be enlarged to make it easier to see.

To [0016] of al, the signal or power lines to connect with quick connect terminals, and a signal line and the power line 2
When the quick connection terminals corresponding to each set of the signal line and the power supply line are electrically connected to each other so that the connection can be made by each pair, the use of the quick connection terminals simplifies the connection work, and furthermore, By sending and wiring lines and power lines, when a large number of display terminals are intensively arranged at one place, connection can be made with a simple operation of simply connecting signal lines and power lines in order. There is an advantage that can be performed.

[0017]

As shown in FIG . 2, a display terminal 34 has a rectangular parallelepiped body 11 having a front opening. A holding frame 12 is joined along the opening edge of the body 11, and a name cover 13 made of a transparent synthetic resin is detachably attached to the front side of the holding frame 12. The holding frame 12 has a body 1
A coupling leg 12b, which is inserted into the inside of the body 1 and has an engagement protrusion 12a at the distal end, protrudes, and an engagement hole 11a formed in the peripheral wall of the body 11 when the holding frame 12 is mounted on the body 11.
The engagement of the engagement protrusion 12a with the body 11
The cover 11 is fixed to the cover. At this time, the peripheral portion of the holding frame 12 projects outward from the peripheral surface of the body 11 to form a flange portion 12c. Also, the holding frame 12
Is formed on the inner peripheral surface thereof so that the opening area of the rear portion is smaller than that of the front portion. In the holding frame 12, an engaging recess is formed on the inner peripheral surface of the front portion with respect to the step portion 12d. 1
2e is formed, and the name cover 13 is detachably attached to the holding frame 12 by engaging the engaging protrusion 13a projecting from the side surface of the name cover 13 with the engaging recess 12e. It has become so. Further, a thin transparent name film 14 is sandwiched between the peripheral portion of the name cover 13 and the step portion 12d. This name film 1
4 indicates required characters and symbols.

On the other hand, a circuit board 15 on which a circuit portion to be described later is mounted and a display element D is mounted on the front side is housed in the body 11, and a translucent material having a diffuse transmission property is provided in front of the circuit board 15. Of the holding frame 12
It is arranged in a form to be held in. In addition, a quick connection terminal 17 described later is mounted on the rear surface side of the circuit board 15. As described above, the case 10 is configured by the body 11, the holding frame 12, and the lamp cover 16, and a portion corresponding to the lamp cover 16 inside the holding frame 12 functions as a light-transmitting window that transmits light from the display element D. It is. Here, the case 10 is a part of a wiring device in a decorative plate (a plate that covers an exposed portion on a construction surface after the installation of the wiring device) that is used at the time of installation of an embedded wiring device standardized by JIS standards or the like. The dimensions are set so that the body 11 can be inserted into an opening formed for exposing the body 11. As a decorative plate, a plate corresponding to a mounting frame for three large squares using three embedded type wiring devices of standardized unit dimensions is used. The dimensions of the opening are set correspondingly.

On both side surfaces (upper and lower surfaces in FIG. 2) of the body 11, holding projections 21 are projected. The holding protrusion 21 is formed at the front end of a spring piece 23 formed between a pair of substantially parallel slit grooves 22 extending rearward from the opening edge of the body 11, and has a substantially triangular cross section in the front-rear direction. It has become. That is, a front inclined surface 21a is formed on the front side of the holding projection 21 so as to decrease the distance from the side of the body 11 toward the front, and is formed on the rear side with the side of the body 11 toward the rear. After being inclined so as to reduce the distance, an inclined surface 21b is formed (see FIG. 1). When the holding projection 21 is pushed into the body 11, it is urged in the projecting direction by the elasticity of the spring piece 23.

The internal circuit of the display terminal 34 has the configuration shown in FIG. That is, the signal processing unit 41 includes a dedicated integrated circuit having a built-in microprocessor, and the signal processing unit 41 is connected to the signal line Ls through the transmission / reception unit 42. Further, the signal processing unit 41 performs full-wave rectification on the transmission signal Vs transmitted through the signal line Ls, and a power supply that supplies an output voltage of the full-wave rectification circuit 43 to the signal processing unit 41 by making the output voltage constant. A circuit 44 is provided. The signal processing unit 41 operates based on the address data set in the address setting unit 45 configured using a nonvolatile memory such as an EEPROM or a dip switch, and decodes the transmission signal Vs to turn on the display element D. Control the state. The display element D is a plane light-emitting element in which a plurality of light-emitting diodes LED are connected in series and arranged in a plane, and is configured to obtain substantially uniform brightness over a relatively large area. I have. The display element D is connected in series to the emitter-collector of a transistor Q serving as a switch element, and the lighting state of the display element D is controlled by controlling the transistor Q to be turned on / off by the output of the signal processing unit 41. Is done. Further, a series circuit of the emitter-collector of the transistor Q and the display element D is connected between the output terminals of the power supply circuit 46. Power supply circuit 46 stabilizes the output voltage of rectifier circuit 47 that performs full-wave rectification of AC (for example, 24 V) input from an external power supply. When the display terminal 34 is provided on the monitoring control panel 35 or the like, a remote control transformer (transformer for supplying power for excitation to a remote control relay operated by a switch at hand) is provided in the monitoring control panel 35. from being, Ru obtain an external power source from the remote control transformer. The signal processing section 41 is also connected with a clock generation section 48 for generating a clock signal and a reset circuit 49 for resetting at the start of operation.

The display terminal 34 is connected to the signal line Ls.
The signal terminal T ₁ and the power supply terminal T ₂ for connecting the power supply line Lp (see FIG. 3) are each composed of a quick connection terminal. The quick connection terminal is basically a terminal plate, lock spring and release button 2.
4 (see FIG. 1), and are inserted through the wire insertion holes 25 ₁ and 25 ₂ (see FIG. 1) formed on the rear surface of the body 11 corresponding to the signal terminal T ₁ and the wire terminal T ₂ , respectively. Is known between the terminal plate and the lock spring by the spring force of a bent spring formed by bending a plate spring, and a part of the lock spring is cut into the electric wire to prevent the electric wire from coming off. It has a configuration. When the electric wire is pulled out of the electric wire insertion holes 25 ₁ and 25 ₂ , the release button 24 presses the lock spring away from the electric wire by pressing with a tool such as a screwdriver to release the engagement state between the electric wire and the lock spring. I do. Here, a total of four quick-connecting terminals are provided since quick-connecting terminals are provided for each of the signal line Ls and the power supply line Lp, and each quick-connecting terminal has two terminals for one terminal plate.
It is configured to have individual lock springs. That is, as it can be connected to two wires to one quick connect terminals, the wire insertion holes 25 _1, 25 ₂ are provided total of 8. With this configuration, the signal line Ls and the power line L
Thus, it is possible to easily perform the p feed wiring.

The display terminal 34 having the above-described structure is similar to that of FIG.
The door 36 of the monitoring and control panel 35 is attached as a mounting panel as shown in FIG. 3A, or the decorative plate 37 used for an embedded wiring device is attached as a mounting panel as shown in FIG. become. In order to mount the body 11 on the mounting panel 26, as shown in FIG. 1, a mounting hole 27 is formed in the mounting panel 26, and the body 11 is inserted into the mounting hole 27 from the front of the mounting panel 26. , Holding projection 21
When the rear inclined surface 21b abuts on the mounting hole 27, the spring piece 23 flexes and is pressed inward, and when the top of the holding projection 21 gets over the periphery of the mounting hole 27, the holding projection 21 Returns to the direction protruding from the body 11, and the front inclined surface 21 a comes into contact with the peripheral edge of the mounting hole 27. Here, since the flange 12c formed on the holding frame 12 abuts on the periphery of the mounting hole 27 of the mounting panel 26, the front slope 21a of the flange 12c and the holding projection 21 is formed.
The case 10 is fixed to the mounting panel 26.

When a large number of display terminals 34 are attached to the monitoring control panel 35 or the like, a large number of display terminals 34 are required.
It is necessary to connect the signal line Ls and the power line Lp to
As shown in FIG. 4, by using the function of the feed lines of the signal terminal T ₁ and the power supply terminal T _2, the signal line Ls and the power supply line L
If p is sequentially sent and wired, the connection work becomes easy.

[0024]

As described above, according to the present invention, a flange protruding from the side of the case is formed on the periphery of the front end of the case, and the flange is biased in a direction protruding rearward from the side of the case. A holding projection is provided to hold the periphery of the mounting hole formed in the mounting panel between the flange and the flange, and the front side and the rear side of the holding projection approach the side surface of the case forward and rearward, respectively. Since the front and rear slopes are inclined in the direction, the mounting hole for inserting the rear part of the case into the mounting panel is formed. The case is locked to the peripheral edge of the mounting hole, and at this time, the peripheral portion of the mounting hole is sandwiched by the holding projection and the flange, so that the case can be fixed to the mounting panel. Also, since the mounting projection is formed with a rear inclined surface, when the case is inserted into the mounting hole, the rear inclined surface contacts the peripheral edge of the mounting hole and is pressed toward the side surface of the case. When the front inclined surface reaches the periphery of the mounting hole, the holding protrusion protrudes due to the urging force acting on the holding protrusion.Since it is a simple work of inserting the case into the mounting hole of the mounting panel, using other members It has the advantage that it can be easily installed without any additional components. In addition, by having the front inclined surface, even if the thickness dimension of the mounting panel changes, there is an effect that the holding projection can cope with the side surface of the case within a range in which it can advance and retreat. In addition, the output light from the display element, which is a surface emitting element,
Equipped with a case formed on the front with a light-transmitting window for transmission
The power to the device is connected via a power line separately from the signal line.
Supplied from a remote control transformer
Can supply relatively large power to the child
In addition, it is possible to use a high-luminance display element.
That the display state can be easily viewed as a result.
There are advantages. In addition, surface emitting devices are used as display devices.
, So the brightness is almost uniform over a relatively large area
There is an advantage that can be obtained.

Further, in the case where the case is formed in a size to be inserted into an opening of a decorative plate used for a wiring device having a size corresponding to three unit dimensions in the standard of the embedded wiring device, When mounting one by one on a wall or the like, the decorative plate of the wiring device can be diverted, and there is no need to use a dedicated mounting member, and there is an effect that cost increase can be suppressed by using a ready-made member. In addition, the appearance after construction can be unified with the design of the ready-made wiring device, so that the appearance is good, and furthermore, the translucent window is formed over substantially the entire front surface exposed from the decorative plate. This has the effect that the display surface can be enlarged to make it easier to see.

To [0026] of al, the signal or power lines to connect with quick connect terminals, and a signal line and the power line 2
When the quick connection terminals corresponding to each set of the signal line and the power supply line are electrically connected to each other so that the connection can be made by each pair, the use of the quick connection terminals simplifies the connection work, and furthermore, By sending and wiring lines and power lines, when a large number of display terminals are intensively arranged at one place, connection can be made with a simple operation of simply connecting signal lines and power lines in order. There is an advantage that can be performed.

[Brief description of the drawings]

1A and 1B show an embodiment, in which FIG. 1A is a rear view showing a state of attachment to a mounting panel, and FIG. 1B is a cross-sectional view showing a state of attachment to a mounting panel.

FIG. 2 is an exploded perspective view of the embodiment.

3A and 3B show an embodiment, wherein FIG. 3A is a front view showing a state of attachment to a monitoring control panel, and FIG. 3B is a front view showing a state of attachment to a decorative plate.

FIG. 4 is a wiring diagram showing a connection example of the embodiment.

FIG. 5 is a block diagram showing an internal circuit of the embodiment.

FIG. 6 is a schematic configuration diagram of a remote monitoring control system.

FIG. 7 is an operation explanatory diagram illustrating a transmission signal used in the remote monitoring control system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Case 11 Body 12 Holding frame 12c Flange 16 Lamp cover 21 Holding projection 21a Front inclined surface 21b Rear inclined surface 25 ₁ Electric wire insertion hole 25 ₂ Electric wire insertion hole 26 Mounting panel 27 Mounting hole 31 Central processing unit 32 Operating terminal 33 Control terminal 34 Display terminal 37 Decorative plate D Display element L Load Lp Power supply line Ls Signal line

Claims (3)

(57) [Claims] 1. A plurality of terminals each having an address are connected to a central processing unit via a two-wire signal line by a time division multiple access system, and the central processing unit transmits a transmission signal including address data. The terminal device is individually accessed by transmitting to the signal line, receiving the monitoring data from the terminal device during the signal return period set in synchronization with the transmission signal, generating control data based on the monitoring data, and monitoring. A display device that is used in a remote monitoring and control system that transmits control data to another terminal having a correspondence relationship between an address and a terminal that has generated data in advance and controls a load connected to the terminal. In the display terminal that performs the display corresponding to the monitoring data with the load as the load ,
A case with a light-transmitting window formed on the front surface for transmitting output light from a certain display element is provided, and power to the display element is connected to a signal line.
Provided separately from a remote control transformer connected via a power line.
The fed, mounted on the peripheral portion of the front end portion of the case flange portion is formed to protrude from the side surface of the case, to the rear than the flange portion is urged in a direction to protrude from the side surface of the case is formed in the mounting panel A holding projection that protrudes the periphery of the hole between the flange and the flange is provided, and a front inclined surface that is inclined forward and rearward to approach a side surface of the case toward the front and rear, respectively, on the front side and the rear side of the holding projection. A display terminal for a remote monitoring and control system, characterized in that a rear inclined surface is formed. 2. A case in which a decorative plate used for a wiring device having a size corresponding to three unit dimensions in a standard of an embedded wiring device is used as a mounting panel and is inserted into an opening of the decorative plate. The display terminal of the remote monitoring and control system according to claim 1, wherein a light transmitting window is formed over substantially the entire front surface exposed from the decorative plate. 3. A signal line and a power supply line are provided on a rear surface of the case.
Two sets of wire insertion holes for insertion are provided.
In the case, signal lines and power lines are
Signal and power lines by sandwiching
Quick connection terminals for electrical and mechanical connection are provided.
And the power supply wires of each set.
The quick connection terminals to be connected are electrically connected to each other.
Display terminal unit of the remote monitoring control system according to claim 2, wherein Rukoto.