JPH0141076B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention connects one base unit and multiple terminal units to each other via a signal line, and centrally controls multiple relays connected to each terminal unit by 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 read, and according to the control signal, the multiple terminal devices connected to the terminal device 3 It controls remote control relays 4 ₁ to 4 ₄ . Each remote control relay 4 ₁ ~
₄₄ can also be controlled by local switches ₈₁ to ₈₄ . FIG. 2 shows a circuit for driving the remote control relay 4. First, the remote control relay 4 is composed of a single winding polarized latching relay, and has a main contact 5 and an auxiliary contact 6. have. Antiparallel diodes D ₁ and D ₂ are connected to the auxiliary contact 6, and the relay coil 7 is excited by the half-wave current, and the auxiliary contact 6
When the current is reversed, the excitation current is stopped by the rectifying action of the diodes D ₁ and D ₂ . 8
is the diode D ₁ , D ₂ in antiparallel to the changeover switch 9.
By switching the local switch 9 to the ON or OFF position, the rectifying direction of the AC power source 10 can be changed and the remote control relay 4 can be turned on and off. Reference numeral 11 denotes a control contact of the terminal device 3, which is switched and controlled by a control signal sent from the base device 1 via the signal line 2. Antiparallel diodes D ₅ and D ₆ are also connected to this control contact 11 . Reference numeral 12 denotes a relay drive contact, which is closed for several milliseconds to several tens of milliseconds in order to operate the remote control relays 4 ₁ to 4 ₄ connected to the terminal device 3 all at once.
The relay drive contact 12 prevents vibrations from occurring due to the state of the remote control relay ₄ becoming unstable when the local switch 8 is operated. ~4 ₄ are now closed in conjunction with each other. 13 is a photocoupler for monitoring, which does not operate when the auxiliary contact 6 of the remote control relay 4 is connected to the diode D1 side, but when the auxiliary contact 6 is connected to _the diode _D2 side, the internal light is emitted. The diode lights up and a monitoring input signal is input to the terminal 3.

By the way, when controlling a plurality of remote control relays 4 ₁ to 4 ₄ with one terminal device 3 as in the conventional example above, there are cases where it is desired to operate only one relay among several relays. arise. For example, in Fig. 1, remote control relays 4 ₁ to 4 ₃ are left as they are,
If you want to turn on only remote control relay 4 ₄ ,
To deal with such cases, conventionally the following two methods were used:
There was one method. The first method is to store the status 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 this data is 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 remote control relays 4 ₁ to 4 ₄ are controlled by external local switches 8 ₁ to 8 ₄ , 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. Base device 1 monitors whether the relay connected to terminal device 3 is on or off using the address. In this method, only the necessary portions of the imported data are changed and the transmission is controlled on the second access. If this method is used, no extra memory is required, but for one-time control, base device 1 is connected to terminal device 3.
It is necessary to access the data twice, which requires twice as much control time, which poses a problem in terms of speed.

The present invention has been made to solve these problems of the conventional example, and it changes the control state of a specific relay to the control state of other relays among a plurality of relays connected to a terminal. The purpose 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 the terminal device 3 in the remote control system according to an embodiment of the present invention, and the configuration of the entire system including the terminal device 3 is similar to the conventional example shown in FIGS. The same is true. 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. 8-bit control data CD, 1-bit control data parity CP, and 5 bits for waiting period for return signal.
A signal in which long pulses of up to 6 bits are sequentially arranged in series is sent out, 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. By reading and controlling the load, and by short-circuiting the signal line 2 through an appropriate impedance during the long pulse sending period from the base unit 1, the monitoring signal is transmitted to the base unit 1 in the current mode as shown in FIG. 4b. It is now possible to send it back to the side. In the terminal device 3, as shown in FIG. 3, a diode bridge 14 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 device 3. It is something that In FIG. 3, 15 is a smoothing capacitor, 16 is a backflow prevention diode, and 17 is a waveform shaping diode. The voltage across the smoothing capacitor 15 described above is applied between the power terminals V _DD and V _SS of the terminal LSI 18 . Further, the signal voltage on the signal line 2 is applied to the signal input terminal S _IG . SW ₁ to _{SW 2} are address setting switches, which input 8-bit address signals to address input terminals A ₁ to _{A 8} of the terminal LSI 18. When the terminal LSI 18 matches the address data AD on the signal line 2 and its own unique address, it reads the 8-bit control data CD following the address data AD and outputs it to the control output terminals RD ₁ to RD ₈ . be. Accordingly, the set coil La and reset _{coil Lb of} the two-winding type latching relay ₁₉ are energized in accordance with the output of the terminals RD ₁ and RD ₂ among the control output terminals RD 1 to RD ₈ . The coils L _a and L _b of the latching relay 19 are excited by the transistors Q ₁ ,
This is carried out by a relay drive circuit consisting of _Q2 , and the timing of excitation is determined by the transistor _QX , which is turned on by the output of the relay drive terminal DRD. Further, I ₁ to _{I 4} are monitoring input terminals, of which the emitter output of the phototransistor 13 ₁ is applied to the terminal I ₁ . This phototransistor 13 ₁ has the power supply voltage from the constant voltage diode 17 applied to its collector side, so that the phototransistor 13 1
₁ is conductive, the monitoring input terminal I ₁ has an H level.
A level signal is applied. 13 ₂ is a photo coupler 1 along with a photo transistor 13 ₁
This is a light emitting diode constituting part 3. Such a photocoupler 13 is also provided at the other monitoring input terminals I ₂ to _{I 4} . and these monitoring input terminals I ₁ to _{I 4}
This state is returned to the base unit 1 side in current mode via the signal line 2 by turning on and off the transistor 20 according to the output of the return output terminal RET during the long pulse sending period from the base unit 1. It is.

Next, the relationship between the outputs of the terminals RD ₁ and RD ₂ and the excitation states of the coils _La and L _b of the latching relay 19 will be explained. First, the logical value of terminals RD ₁ and RD ₂ is 1,
When it is 0, the output of the coincidence detection circuit 21 is 0.
The outputs of AND circuits A ₃ ′ and A ₄ ′ are 0.
In addition, the outputs of inverters I ₁ ′ and I ₂ ′ are 0 and 1, respectively.
Therefore, the outputs of AND circuits A ₁ ' and A ₂ ' become 1 and 0, respectively, and therefore the outputs of OR circuits OR ₁ and OR ₂ become 1 and 0, respectively. Therefore, the transistor Q ₁ is turned on and the transistor Q ₂ is turned off, and the coil L _a of the latching relay 19 is excited at the timing when the transistor Q _X is turned on by the output of the relay drive terminal DRD. As a result, the control contact 11 is switched to the ON position, and the relay drive contact 12 is closed by the excitation of the coil _LX , and the remote control relay 4 is turned on. Next, when the logical values of terminals RD ₁ and RD ₂ are 0 and 1,
The output of the coincidence detection circuit 21 is also 0, and the outputs of the AND circuits A ₃ ', A ₄ ' are also 0. Also, since the outputs of inverters I ₁ ′ and I ₂ ′ are 1 and 0, respectively,
The outputs of the AND circuits A ₁ ' and A ₂ ' become 0 and 1, respectively, and therefore the outputs of the OR circuits OR ₁ and OR ₂ become 0 and 1, respectively. Therefore, transistor Q ₁ is turned off and transistor Q ₂ is turned on, and latching relay 19 is turned on.
Coil L _b is excited and control contact 11 is turned OFF.
position, and the remote control relay 4 is turned off. Next, when the logical values of the terminals RD ₁ and RD ₂ are 0 and 0, the output of the coincidence detection circuit 21 is 1, and the output of the inverter I ₁ ' is 1, so the AND circuits A ₃ ', A ₄ ′ can pass through the signal at terminal _PX . For example, the _fifth
The output of a relay state detection circuit 22 as shown in the figure is applied. This relay state detection circuit 22 has a photocoupler ₂₃ and a capacitor _{C X} is charged and the logic value of terminal _PX becomes 1.
Furthermore, when the remote control relay 4 is off, the current flowing to the photocoupler 23 is blocked by the diode D ₁ and _the capacitor _C
The charged charge is discharged, and the logic value of the terminal _PX becomes 0. Therefore, the terminal RD ₁ of the terminal LSI 18,
When the logical value of RD ₂ becomes 0, 0, the on/off state of the remote control relay 4 is maintained as it is. In other words, when remote control relay 4 is on, the logical value of terminal _PX becomes 1, so
The outputs of the AND circuits A ₃ ′ and A ₄ ′ are 1 and 0, and the control contact 11 is driven to the ON position. Conversely, when the remote control relay 4 is OFF, the logic value of the terminal _P becomes 0, so the AND circuit A ₃ ′,
The output of _A4 ' becomes 0 and 1, and control contact 11 is OFF.
It is driven into position. Note that the terminal RD ₁ ,
When the outputs of RD ₂ are both 1, the outputs of inverters I ₁ ′ and I ₂ ′ are both 0, so the outputs of each AND circuit A ₁ ′ to _{A 4} ′ are 0, and the transistors
Although Q ₁ and Q ₂ are not driven, the terminals RD ₁ and
A control signal that causes both the outputs of RD ₂ to be 1 is not used in this embodiment. FIG. 6 shows an example of a transmission signal used in this embodiment, in which an 8-bit address signal is followed by an 8-bit control signal with logical values 1, 0, 0, 1, 0, 0, 0, 0. A signal is being transmitted. Therefore, in this case, the logical values of the terminals RD ₁ and RD ₂ are 1 and 0, so the remote control relay 4 ₁ is turned on, and the terminals RD ₃ and RD 2 are turned on.
Since the logic value of RD ₄ becomes 0 and 1, the remote control relay 4 ₂ is turned off, and since the logic values of terminals RD ₅ to _{RD 8} are all 0, the remote control relays 4 ₃ and 4 ₄ are turned on and off at that point. It maintains the status as it is.

The present invention is configured as described above, in which a terminal device having at least two or more latching relays for load control and a parent device are connected to each other via a signal line, and the parent device is connected to at least one terminal device. In a remote control system that sends out a control signal consisting of a digital signal of 4 bits or more, the 2-bit control output assigned to one latching relay is input, and the "1" signal generated by the combination of the 2-bit control output is input. , 0” or “0, 1”
When the first and second control information is input, the latching relay is turned on and off, respectively, and when the third control information of "0, 0" is input, the latching relay is turned on and off according to the output of the relay state detection circuit. Since each latching relay is equipped with a control information discrimination circuit that operates the relay drive circuit to maintain the on/off state of the If the third control information is transmitted for those that do not require a change in the latching relay, the on/off state of the latching relay will be detected by the relay state detection circuit, and the relay will be driven to maintain the on/off state. Since the circuit operates, the current state of relays whose control contents are not changed can be maintained as is, and only the relays that need to be changed can be operated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a conventional remote control system, FIG. 2 is a circuit diagram of a main part of the same terminal, and FIG. 3 is a circuit diagram of a main part of an embodiment of the present invention.
4a and 4b are operating waveform diagrams as above, and FIG. 5 is a circuit diagram of a relay state detection circuit used in the above embodiment,
FIG. 6 is a diagram showing an example of a transmission signal in the above embodiment. 1 is the base unit, 2 is the signal line, 3 is the terminal unit, 4, 4 ₁
~4 ₄ is a remote control relay, 21 is a coincidence detection circuit,
22 is a relay state detection circuit, I ₁ ′ to I ₃ ′ are inverters, A ₁ ′ to _{A 4} ′ are AND circuits, OR ₁ and OR ₂ are OR circuits, and Q ₁ and Q ₂ are transistors.

Claims (1)

[Claims] 1 A terminal device having at least two or more latching relays for load control and a base unit are connected to each other via a signal line, and a control signal consisting of a digital signal of at least 4 bits is transmitted from the base unit to the terminal unit. The terminal device is equipped with a circuit that latches the control signal and outputs it as a control output, a relay drive circuit that turns the latching relay on and off, and a relay state detection circuit that detects the on/off state of the latching relay. , the 2-bit control output assigned to one latching relay is input,
When inputting the first and second control information of "1, 0" or "0, 1" generated by a combination of 2-bit control outputs, the latching relays are turned on and off, respectively, and the latching relays are turned on and off, respectively. Each latching relay is provided with a control information discrimination circuit that operates a relay drive circuit to maintain the on/off state of the latching relay according to the output of the relay state detection circuit when the third control information is input. A remote control system characterized by: