JPS6219062Y2 - - Google Patents

Description

[Detailed description of the invention] This invention connects one base unit and multiple terminals to each other via signal lines, and centrally controls multiple loads installed on each terminal using the base unit. This invention relates to a remote control system.

FIG. 1 is a block diagram showing the overall configuration of a conventional general remote monitoring and control system. Terminals 3 are connected in parallel.
Each terminal device 3 is assigned a unique address, and the base device 1 transmits address signals and control signals to each terminal device 3 in a time-sharing manner and cyclically. 3 is main unit 1
When the address signal matches the address uniquely assigned to the terminal device 3, the control signal accompanying the address signal is continued, and the relay of the terminal device 3 is activated according to the control signal. The contact point 5 of this relay 4 is used to control the load of electrical equipment such as a lighting load or an air conditioner. In addition, in the return signal section following the control signal section,
The status of the monitoring input 6 of the terminal 3 is sent back to the base unit 1, and the status of, for example, a wall switch, daylight sensor, or controlled load is transmitted to the base unit 1 via the monitoring input 6 of the terminal 3. This item is being sent back to Japan.

FIG. 2 shows the configuration of a relay control section in such a conventional example. In the figure, the terminal LSI
Relay control terminals RD ₁ to RD ₄ of 3a each have 2
A latch output of 1 or 0 is obtained to control the on/off of wire-wound latching relays Ry ₁ to _{Ry 4.} When a relay drive pulse is output from terminal DRD, transistor Qx is turned on and each latch is turned on. The switching relays Ry ₁ to Ry ₄ turn on and off simultaneously. For example, if the output of relay control terminal RD ₁ is 1, transistor Q ₁ a is turned on, transistor Q ₁ b is turned off,
Current flows through the set coil _L1a of latching relay Ry ₁ , turning on the contact of latching relay Ry ₁ . Conversely, if the output of the relay control terminal RD ₁ is 0, the transistor Q ₁ a is turned off, the transistor Q ₁ b is turned on, and current flows through the reset coil L ₁ b of the latching relay Ry ₁ . The contact of latching relay Ry ₁ turns off.

However, multiple latching relays Ry ₁
When controlling Ry ₄ with one terminal device LSI 3a, there may be a case where it is desired to operate only one relay among several relays. For example, in FIG. 2, if it is desired to turn on only relay Ry ₄ while leaving relay Ry ₁ as it is, there have conventionally been two methods for dealing with such a case. The first method is to store the state of the terminal device 3 in the memory of the base device 1. For each terminal device 3, the most recently controlled data is stored in the memory of the base device 1, and the data can be stored when necessary. This is a method of extracting data, changing only the part to be changed, and transmitting it to the terminal device 3. However, in this method, base device 1 requires extra memory to store the status of terminal device 3. Further, if the relay is controlled by an external manual switch or the like, the data held by the base unit 1 becomes meaningless. Next, the second method is to monitor the status of the terminal 3 before controlling it, and this method is used when it is necessary to control a certain terminal 3. Upon access, base device 1 monitors whether the state of the relay connected to terminal device 3 is on or off. Then, change only the necessary parts of the imported data,
This is a method of controlling transmission on the second access. If this method is used, no extra memory is required, but base device 1 can control terminal device 3 twice in order to control it once.
This requires twice as much control time, which poses a problem in terms of speed.

The present invention was developed to solve these problems of the conventional example, and it changes the control state of a specific load to the control state of other loads among multiple loads connected to a terminal. The purpose of this is to provide a remote control system that allows changes to be made from the parent device side without affecting the system.

The configuration of the present invention will be described below with reference to illustrated embodiments. FIG. 3 is a circuit diagram showing the configuration of a terminal device 3 in a remote control system according to an embodiment of the present invention, and the configuration of the entire system including the terminal device 3 is the same as that of the conventional example shown in FIG. 1. That is, the base unit 1 and each terminal unit 3 are connected to each other via a two-wire signal line 2, and the base unit 1 transmits ±24V bipolar time division multiplex transmission as shown in Figure 4a. A signal is being sent. In this transmission signal, a wide pulse represents a logical value "1" and a narrow pulse represents a logical value "0". Pulse, 8-bit address data AD for selecting a predetermined terminal 3..., 1-bit address parity AP, 1-bit pulse with logical value "1", and control contents for the called terminal 3 are set. 5-bit control data CD, 1-bit control data parity
A signal is sent out in which long pulses corresponding to 5 to 6 bits, which is the waiting period for the CP and return signals, are sequentially arranged in series, and this signal is sent out cyclically and repeatedly one after another for each address. Each terminal device 3 uses full-wave rectification of the signal power sent through the two-wire signal line 2 to use as its own operating power source, and uses the control data CD included in the signal. The load is controlled by reading the signal, and the fourth
The monitoring signal is sent to the base unit 1 in current mode as shown in Figure b.
It is now possible to send it back to the side. However, in the terminal device 3, as shown in FIG.
A diode bridge 7 is connected to the signal line 2, and the signal power on the signal line 2 is full-wave rectified to obtain a DC power source for driving the terminal unit 3. In Figure 3, 8 is a smoothing capacitor, 9 is a backflow prevention diode, and 10 is a smoothing capacitor.
is a constant voltage diode, and the voltage across this constant voltage diode 10 is the power terminal V of the terminal LSI 3a.
It is applied between _DD and V _SS . Further, the signal voltage on the signal line 2 is applied to the signal input terminal S _IG . SW ₁ to _{SW 8} are address setting switches,
An 8-bit address signal is input to address input terminals _A1 to _A8 of the terminal LSI 3a. When the terminal LSI 3a matches the address data AD on the signal line 2 and its own unique address, it reads the 5-bit control data CD following the address data AD and outputs it to the control output terminals RD ₀ to RD ₄ . However, in this embodiment, terminal RD ₀ is not used. Therefore, among the control output terminals RD ₁ to _{RD 4} , terminal RD ₁ ,
Two-winding type latching relay according to the output of RD ₂
Set coil L ₁ a and reset coil L ₁ b of Ry ₁
is becoming excited. The excitation of the coils L ₁ a and L ₁ b of the latching relay Ry ₁ is performed by a relay drive circuit consisting of transistors Q ₁ a and Q ₁ b, and the excitation timing is determined by the output of the relay drive terminal DRD. is determined by transistor Qx, which is conductive by . Also, I ₁ to _{I 5} are monitoring input terminals, among which terminal I ₁
The emitter output of the phototransistor 11 is applied to. The power supply voltage from the constant voltage diode 10 is applied to the collector side of this phototransistor 11, so when the phototransistor 11 is conductive, the monitoring input terminal I ₁
An H level signal is applied to. 1
2 is a photocoupler together with a phototransistor 11
These are light emitting diodes that make up a PC. Such photocoupler PCs are also provided at the other monitoring input terminals _I2 to _I5 . and these monitoring input terminals I ₁ to _{I 5}
The state of is returned to the base unit 1 in current mode via the signal line 2 by turning on and off the transistor 13' according to the output of the return output terminal RET during the long pulse sending period from the base unit 1. It is something.
Next, 13 is a coincidence detection circuit, and a control output terminal
When the outputs of RD ₁ and RD ₂ are both 1 or 0, the signal switching circuit 14 sends a switching signal,
As a result, the outputs of the signal switching circuit 14 both become 0. Therefore, both transistors Q ₁ a and Q ₁ b are not conductive, and the state of latching relay Ry ₁ does not change. Also, the output of one control output terminal RD ₁ is 1
If the output of the other control output terminal RD ₂ is 0, the coincidence detection circuit does not operate, so the signal switching circuit 14 outputs the input signal as it is, and therefore the setting coil of the latching relay Ry ₁
L ₁ a is energized and the contact of latching relay Ry ₁ is turned on. Furthermore, when the output of the control output terminal RD ₁ is 0 and the output of the control output terminal RD ₂ is 1, the reset coil of the latching relay Ry ₁ is
L ₁ b is energized and the contact of latching relay Ry ₁ is turned off. By the way, such a coincidence detection circuit 13
The remaining control output terminals RD ₃ and RD ₄ are connected in the same way, and the signal switching circuit 14 and relay drive circuit are connected in the same way to other latching relays.
It is designed to drive Ry ₂ . Therefore, if one of the latching relays Ry ₁ is turned on and the other latching relay Ry ₂ is to remain in the same state, the outputs of the control output terminals RD ₁ and RD ₂ will be set to 1 and 0, respectively. Remaining control output terminals
The control signal CD that sets both RD ₃ and RD ₄ to 1 or 0 may be sent from the base unit 1. In this way, the state of one of the two latching relays Ry ₁ and Ry ₂ can be maintained as it is, and only the control state of the other can be changed from the base unit 1 side.

The present invention is configured as described above, and each relay drive circuit is provided with a coincidence detection circuit that detects coincidence of a pair of control outputs that are input to the relay drive circuit, and when the coincidence detection circuit is in operation, the coincidence detection circuit is Among the plurality of two-winding latching relays installed in the terminal, only one of the two-winding latching relays is
For those that do not require a change in the control state, if a control signal consisting of both 1 or both 0 is sent, the coincidence detection circuit will operate and the operation of the relay drive circuit will be blocked. Among multiple loads controlled by a two-winding latching relay, the advantage is that the control state of a specific load can be changed from the parent unit side without affecting the control state of other loads. It has the following.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of a conventional remote control system, Fig. 2 is a circuit diagram of the main part of the same terminal, Fig. 3 is a circuit diagram of the main part of an embodiment of the present invention, and Fig. 4 a. , b are operation waveform diagrams of the same as above. 1 is a base unit, 2 is a signal line, 3 is a terminal device, 3a is a terminal LSI, 13 is a coincidence detection circuit, 14 is a signal switching circuit, Q ₁ a, Q ₁ b are transistors, L ₁ a, L ₁ b is a coil, and Ry ₁ is a latching relay.

Claims (1)

[Scope of utility model registration request] A terminal device having at least two two-winding latching relays for load control and a parent device are connected to each other via a signal line, and the parent device controls the terminal device using a digital signal of at least 4 bits or more. The terminal device is equipped with a circuit that latches the control signal and outputs it as a control output, and a relay drive circuit that individually controls the energization of the set coil and reset coil of the two-winding latching relay by a pair of control outputs is installed in each terminal. A coincidence detection circuit is provided for each two-winding latching relay to detect coincidence of a pair of control outputs that are input to the relay drive circuit. A remote control system comprising means for inhibiting operation of a corresponding relay drive circuit.