JPH0210663B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a return method in a power line transport control system.

[Prior Art] Generally, this type of power line carrier control system is
It uses power lines as signal lines to perform remote control and monitoring, etc. Conventionally, as shown in Fig. 1, transmitters 1a, 1
b and receivers 2a, 2b are connected to the power line 3, and loads 4a, 4b are connected to the receivers 2a, 2b. For example, when a signal is transmitted from the transmitter 1a,
The receiver 2a receives this and operates relay contacts and the like to control the load 4a on and off. Transmitter 1b
The receiver 2b is operated in the same manner. In this way, considering the case where a plurality of transceivers are present, each transceiver is given an address code, and the signal format using this code is shown in FIG. In Figure 2, S is a 1-bit start mark, which is used to synchronize the transmitter and receiver, and M is a 4-bit mode code, which indicates the content of the signal to be controlled, such as whether it is on or not. Set it to "0000" for example, "0001" for off, "1000" for dimming, and so on. A is the address code mentioned above, 4
The transmitter/receiver 1a, 2 consists of 16 pairs of transmitters/receivers (corresponding with the same address code).
a, 1b, 2b... can exist at the same time. C is a 4-bit control code, which is used to transmit additional information such as the dimming level during dimming. FIG. 3a shows an example of the content of one bit of the above-mentioned carrier signal. Here, the carrier signal is sent in synchronization with the power frequency of the power line 3, and one bit of information is transmitted during a half wave. A zero-crossing pulse as shown in FIG. 3b is taken out from the power supply waveform as a basic synchronization signal. FIG. 3a shows a waveform on the power line 3 on which a carrier signal is actually superimposed, and the carrier signal is superimposed on an AC waveform. In addition, in Figure 3a, the half-wave interval is divided into four, and the reliability is improved by dividing the half-wave section into four, and the four data are "0101" as the start mark, "0100" as data "0", and "0111" as data "1". This is what I did.

FIG. 4 shows the input/output in normal use. The transmitter 1 is connected to operation keys 5 such as an on key 5a, an off key 5b, or an up key and a down key (not shown), and an on relay drive from the receiver 2. output, off-relay drive output, dimming triax, trigger output, etc., and operating the on-relay winding 6a or off-relay winding 6b to operate a two-winding latching type relay, or the dimming triax 7. The lamp 8 is dimmed by changing the phase of the trigger pulse. When the series of transmission control signals shown in Figure 5a is completed, the on-relay drive output signal (or off-relay drive output signal)
is outputted as shown in FIG. 5b, and, if necessary, a triact trigger output signal for dimming is outputted as shown in FIG. 5c.

The transmitters 1a, 1b, 1 and receivers 2a, 2b, 2 of FIG. 1 or 4 are constructed as shown in FIG. 6. The transmitters 1a, 1b, 1 monitor the signal on the power line 3 and transmit only when there is no signal, so the transmitters 1a, 1b, 1 and the receivers 2a, 2b, Both have a common circuit configuration. 9 is a modulation/demodulation section, which consists of an oscillation circuit, a switching circuit, a receiving amplifier, a power amplification circuit, a zero-cross detection circuit, etc.
Convert the above carrier signal to a logic level signal,
It also modulates the transmission data carrier wave and puts it on the power line 3. Reference numeral 10 denotes a CK generation section, which is composed of a waveform shaping circuit, a counter, etc., and generates the clock pulses necessary for each section based on the zero-cross pulse from the AC power supply. Reference numeral 11 denotes a received signal verification unit which classifies the received and modulated data into data "1", "0", start mark, etc. 12 is a reception shift register that converts the 1/0 data from the reception signal verification section 11 into parallel data and decomposes it into a mode code, an address code, and a control code. Reference numeral 13 denotes an address verification section, which is composed of a gate circuit, and verifies whether the address code of the received signal matches its own address (whether the signal is sent from the corresponding transmitter 1a, 1b to itself). 14 is the mode verification department,
Verify what the mode code of the received signal is. 15 is a relay drive try trigger section, which includes a counter that outputs a relay drive pulse to the relay drive output for a certain period of time according to the mode code, and a trigger pulse for phase control after a certain period of time from the zero cross point according to the control code. It consists of a counter. Reference numeral 16 denotes a dimming data reproducing unit which reads the contents of the control code when receiving the dimming mode and determines the position of the tryout trigger pulse. Reference numeral 17 denotes a key input section which accepts key inputs such as on and off operations, and also inputs transmission data such as dimming data and converts it into a logic signal.
Note that address data, which is initial setting data, is also input via the key input section 17. Reference numeral 18 denotes a transmission data creation unit that creates parallel data to be transmitted based on key-input data, transmission/reception setting status, and the like. 1
Reference numeral 9 denotes a start pulse generating section which generates a start pulse for starting a transmission operation when a key is input. 20 is a transmission shift register which converts transmission parallel data into serial data; 21
is a transmission signal generation unit which inputs the serial data from the transmission shift register 20 one bit at a time to the final modulation/demodulation unit 9.
Create a signal to. 22 is an error detection section, which detects the transmission signal obtained from the transmission data creation section;
The signal is compared with the reception signal received during transmission obtained from the reception shift register 12, and if they do not match, the transmission operation is stopped and the original state is kept on standby. Reference numeral 23 denotes a busy detection unit, which temporarily waits if there is already a signal or noise on the power line 3 when attempting to transmit, and outputs a signal to start transmission again after a certain period of time. Reference numeral 24 denotes a transmission/reception timing control section, which sets the timing of transmission and reception, operates each section according to a clock signal, stops transmission when an error signal occurs, and retransmits after waiting for a certain period of time. 25 is a power source consisting of a diode bridge, a transistor, a capacitor, etc.

The power line carrier control system consisting of the transceiver with the above configuration is capable of controlling the relay of the receiver 2 on and off according to the mode code, and also allows dimming according to the signal from the transmitter 1. ,
Furthermore, if an error occurs during transmission, retransmission is performed, and transmission can only be performed when no other signal is superimposed on the power line 3.

Fig. 7 shows the conventional example shown in Fig. 6 with a 4-bit parallel transmission function added.The difference from the one shown in Fig. 6 is that a data input section 26 is provided in the transmitting section to allow input of system data. Another feature is that a control data output section 27 is provided in the receiving section to output 4-bit parallel output of control data, and the output of the mode verification section 14 is input to the control data output section 27. Another point is that a mode data output section 28 is provided.

In FIG. 8a, a transmitter 1 and a receiver 2 using the circuit shown in FIG. 7 are connected to a power line 3, and four controls and four monitors are performed. A control signal is input to the transmitter 1 and transmitted with a mode code of "0000". In this case, the mode code is a code that sets the signal mode when performing 4-control 4-monitoring, and has a different meaning from the mode code when performing dimming control described above (both systems do not coexist). 8b shows the format of the signal sent from the transmitter 1 to the receiver 2, and FIG. 8c shows the format of the signal sent from the receiver 2 to the transmitter 1. The receiver 2 receives this signal and controls the controlled loads 4a to 4d according to the control signal carried in the control code portion, and also monitors the controlled loads 4a to 4d. The supervisory signal is input from the supervisory input, and the supervisory signal with the mode code "0100" is added to the control code portion and sent back to the transmitter 1, and the transmitter 1 receives and displays the returned supervisory signal. There is no problem in transmitting the control signal because it is done manually when changing the control content, but when monitoring the controlled loads 4a to 4d is performed unattended as shown in FIG. 9, the return signal is started. The problem is how to apply the strobe pulse. Incidentally, in FIG. 9, 29a to 29d are lamps that display the monitoring status.

FIGS. 10a to 10c show conventional examples for obtaining strobe pulses. As shown in FIG. 10a, a counter 30 is used to count a certain period of time, and the first strobe pulse is
A strobe pulse was generated as shown in Figure 10b, and a monitoring return signal as shown in Figure 10c was obtained. In a power line carrier control system, once one signal is placed on a signal line, other signals cannot be placed on the signal line. Therefore, it is necessary to keep the line open as much as possible when it is not needed.

[Problems to be Solved by the Invention] However, in the conventional example described above, the states of the loads 4a to 4d are monitored at regular time intervals, and the monitoring input is directly transmitted from the receiver 2 to the transmitter 1. Even when the load is operating normally, a signal indicating the operating status is transmitted from the receiver 2 at regular intervals, and as the number of signal transmissions for operation monitoring increases, the transmitter 1 and the receiver 2 When the number of controllers increases, there is a problem in that the response speed during normal control operations becomes slow.

The present invention has been made in view of the above points, and its purpose is to perform highly reliable control operations and to eliminate unnecessary signal transmission to improve the efficiency of line utilization. It is an object of the present invention to provide a return method in a power line transport control system that can increase the cost.

[Means for Solving the Problems] The return method in the power line control system of the present invention connects a plurality of transmitters and receivers to a power line,
In a power line carrier control system, a control signal for controlling a load is transmitted from a transmitter to a corresponding receiver, and a monitoring signal for monitoring the operation of the load is transmitted from the receiver to a corresponding transmitter,
The control output and monitoring input of the receiver are compared at regular time intervals, and only when they differ, a monitoring signal indicating a discrepancy in status is sent back from the receiver to the corresponding transmitter.

[Operation] As described above, the present invention connects a plurality of transmitters and receivers to a power line, transmits a control signal for controlling the load from the transmitter to the corresponding receiver, and transmits a control signal from the receiver to the corresponding receiver. In a power line carrier control system that transmits a monitoring signal for monitoring load operation to a transmitter, the control output of the receiver and the monitoring input are compared at regular intervals, and only when they differ, the signal is transmitted from the receiver to the corresponding transmitter. It is designed to return a monitoring signal indicating a discrepancy in the status, and the receiver checks whether the control output sent from the transmitter and the monitoring output match at regular intervals, and if there is a discrepancy, Since a signal indicating a state discrepancy is sent back to the receiver side, the transmitter side can always know whether the load is operating normally based on the control output, and can perform highly reliable control operations. In addition, the signal transmission line is not unnecessarily occupied by load operation checks, and the efficiency of line utilization can be increased.

[Embodiment] FIG. 1 shows an embodiment of the present invention, in which a transmitter 1 and a receiver 2 are the same as those in the conventional example. 3
0 is a counter which divides the output of the oscillator 31 and outputs a pulse at regular intervals. The control output and monitoring input of the receiver 2 are compared bit by bit by the EXOR gate 32, and the output thereof is input to the OR gate 33.The output of the OR gate 33 and the output of the counter 30 are input to the AND gate 34, and the output is input to the AND gate 34. gate 34
Try to get a strobe pulse from the output of .
Therefore, when a pulse is output from the counter 30 at regular intervals, if the control output and the monitoring input are different, a strobe pulse enters the receiver 2 and is transmitted back. Therefore, unnecessary signal transmission is eliminated, and line utilization efficiency is improved. Note that similar effects can be obtained when the transmitter 1 is used as a master device and the receiver 2 is used as a slave device in a general power line carrier control system.

[Effects of the Invention] As described above, the present invention connects a plurality of transmitters and receivers to a power line, transmits a control signal for controlling the load from the transmitter to the corresponding receiver, and
In a power line carrier control system in which a monitoring signal for monitoring the operation of a load is transmitted from the receiver to a corresponding transmitter, the control output and monitoring input of the receiver are compared at regular intervals, and the receiver transmits a signal only when they differ. A monitoring signal is sent back from the transmitter to the corresponding transmitter to indicate a state discrepancy, and the receiver checks whether the control output sent from the transmitter and the monitoring output match at regular intervals. Since the transmitter side returns a signal indicating the status mismatch when there is a mismatch, the transmitter side can always know whether the load is operating normally based on the control output, resulting in high reliability. In addition to being able to perform control operations, the signal transmission line is not unnecessarily occupied by load operation checks, and the efficiency of line utilization can be improved.

[Brief explanation of drawings]

Figure 1 is a basic block circuit diagram of a conventional power line carrier control system, Figure 2 is a signal format diagram of the same as above, Figure 3a is a 1-bit carrier signal waveform diagram of the same as above,
Figure b is a zero-cross pulse waveform diagram of the same as above, Figure 4 is a block circuit diagram with an added input/output circuit of a conventional power line carrier control system, Figures 5 a to c are time charts during operation of the same, respectively, and Figure 6 7 is a block circuit diagram of an example of a transmitter or receiver of a conventional power line carrier control system, FIG. 7 is a block circuit diagram of another example of the same, and FIG. Circuit diagram when performing control 4 monitoring,
Figures 8b and 8c are explanatory diagrams of the same operation as above, Figure 9 is a circuit diagram for unmanned monitoring as above, Figure 10a is a circuit diagram for obtaining strobe pulses as above, and Figures 10b and c are The main signal waveform diagram of the same as above and FIG. 11 are circuit diagrams of one embodiment of the present invention. 1 is a transmitter, 2 is a receiver, 3 is a power line, 30 is a counter, 32 is an EXOR gate, 33 is an OR gate, and 34 is an AND gate.

Claims (1)

[Claims] 1 Connect multiple transmitters and receivers to a power line,
In a power line carrier control system, a control signal for controlling a load is transmitted from a transmitter to a corresponding receiver, and a monitoring signal for monitoring the operation of the load is transmitted from the receiver to a corresponding transmitter,
A power line carrier control system characterized in that a control output and a monitoring input of a receiver are compared at regular intervals, and only when they differ, a monitoring signal indicating a discrepancy in status is sent from the receiver to a corresponding transmitter. Return method.