JPS61161031A - Power line carrier control system - Google Patents

Abstract

PURPOSE:To confirm important load information at a short time interval by giving priority to the transmission of load information from each slave set and allowing a master set to stop the transmission of the load information from a slave set with low priority as required. CONSTITUTION:An operation section 236 of a master set 23 gives priority to plural slave sets 24 and sets until which priority for the load information of the slave set is to be received and the number of the set priority is fed to a microprocessor muPC237. The muPC237 prepares a command of a load information transmission request for each slave set 24, and when a zero cross detection signal is inputted from a zero cross detection section 234, the prepared command is used as a frame synchronizing signal FS, which is transmitted to a power line 22 via a transmission section 232 and a coupling section 231 at a prescribed period. The slave set 24 fetches the load information from a detector 25 by the muPC245, and when the count reaches a count of the zero cross signal assigned to the own station when the signal FS is received, the load information is transmitted. A slave set with low priority receives the signal FS before the count reaches the zero cross count assigned to the own station, no load information is transmitted.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention transmits a load information transmission request command from a parent to each slave device to which a load is connected using, for example, an indoor power line, and transmits the load information from each slave device. The present invention relates to a power line transport control system that outputs each returned load information to an output device.

[Technical Background of the Invention] For example, in one home, each load consisting of various detectors such as an intrusion detector, a gas leak detector, an earth leakage detector, etc. is transmitted from a base unit equipped with a display using an indoor power line. Sends a load information transmission request command to each slave device to which the detection signal is input,
As shown in FIG. 3, a power line transport control system that displays load information transmitted from each slave unit on a display unit includes a transmitting unit, a receiving unit, and a data processing unit connected to a power line 2 connected to a commercial AC power source 1, as shown in FIG. At the same time as connecting the base unit 3 having
A plurality of slave devices 4-1, 4-2, . Each slave unit 4-1, 4-2...4-n is connected to each load 5-1゜5-2...5-n consisting of the various detectors mentioned above, and the main unit 3 is connected to each load 5-1゜5-2...5-n. A display section 6 as an output device is connected.

Then, as shown in FIG.
Based on the information, a high frequency signal is superimposed as a carrier wave on the power supply waveform a of , and each slave unit 4-1 to 4-n receives it and interprets the data.
- Load information indicating the status of 5-n is read. In this case, the information transmitted from is3 is, for example, a frame synchronization signal FS indicating a load information transmission request command as shown in d of FIG.
Each slave device 4-1 to 4-n that receives the command counts the pulse-like zero-cross detection signal indicating the polarity reversal timing of the power waveform a carrying the command, and determines the count value as its own device number. When it matches, the load information of the load connected to itself is sent to the power line 2.

For example, if the device is composed of six slave units as shown in Fig. 4, a frame synchronization signal S indicating a command is sent from the master unit 3.
When F is sent to power line 2, this frame synchronization signal F
A carrier wave indicating the load information sent from the first slave unit 4-1 is superimposed on the power waveform a of the next half cycle after the half-cycle power waveform a on which the carrier wave containing S is superimposed. Therefore, when six slave units 4-1 to 4-6 are connected, the base unit 3 connects all six slave units 4-1 to 4-4 after three cycles have passed since the frame synchronization signal FS. 6
will receive load information from.

Then, the base unit 3 displays the received load information of the six slave units 4-1 to 4-6 on the display unit 6.

If the carrier wave superimposed on the power waveform a exists in the first half of the half cycle, it is determined that it is the frame synchronization signal FS from the base unit 3, and the carrier wave exists in the second half of the half cycle. If so, it is determined that the load information is from each slave device 4-1 to 4-n.

In addition, in Figures 3 and 4, when no abnormality is detected in each detector serving as a load, the load information sent to the base unit 3 is [0], and only when an abnormality is detected, the load information is [1].
Send load information. For example, in FIG.
This indicates that an abnormality has been detected by the third and fifth detectors.

[Problems with Background Art] However, the power line carrier control system configured as described above has the following problems. That is, since the time required for one slave unit 4 to transmit load information to the base unit 3 is half a cycle of the N source waveform a, the frequency of the commercial AC power supply 1 is set to 50)tz, and the time required for one slave unit 4 to transmit load information to the base unit 3 is 1-4
If the number of installations of -n is 1000, the time required for the M machine 3 to receive the load information of all slave machines 4-1 to 4-1000 is about 20 seconds.

Therefore, a maximum of 20 seconds will elapse after an abnormality is detected in one detector until it is displayed on the display unit 6 of the base unit 3, which may delay the response to the abnormality detection and cause a serious situation. There is a risk of development.

Also, among the large number of detectors, there are some that are not very important. However, the detection information (load information) of all the detectors is transmitted to the base unit 3 at the same priority level and displayed on the display unit 6. Therefore, there is also the problem that the time interval at which load information from important detectors such as gas leak detectors and electric leak detectors is displayed on the display section 6 becomes longer.

[Object of the Invention] The present invention has been made based on the above-mentioned circumstances, and its purpose is to prioritize the transmission order of load information transmitted from each slave unit and to The purpose of the present invention is to provide a power line transport control system that can stop the transmission of load information from slave devices with low priority as necessary, check important load information at short time intervals, and improve the reliability of the entire system. .

[Summary of the invention] The present invention provides a transmitter for a power line of a commercial AC power source.

A base device and a transmitter having a receiver and a data processor.

A plurality of slave units each having a receiving unit and a data processing unit are connected, and a load information transmission request command from the base unit is superimposed on the power supply frequency using a high-frequency signal as a carrier wave and transmitted over the power line, and each slave unit transmits the command. The carrier wave is received and the load information indicating the status of the load connected to each slave unit is transmitted on the power line, and the base unit sequentially receives the carrier wave from each slave unit and deciphers the load information from each slave unit. In a power line transport control system that outputs load information from an output device, the transmission order of load information transmitted from each slave unit is set in a preset priority order for each slave unit, and the lower priority is Before receiving the load information from the slave device, send the next load information transmission request command, and each slave device transmits its own load information between receiving the command and receiving the next command. If the ranking is not reached, the transmission of this load information is stopped.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing a power line carrier control system according to an embodiment, and numeral 21 in the figure is a commercial AC power source of, for example, 50 Hz. An indoor power line 22 is connected to this commercial AC power source 21. Then, the main unit 23 and the slave unit 2 are connected to the power line 22.
4 is connected. Although a plurality of cordless handsets 24 are connected corresponding to the number of installed loads including intrusion detectors, gas leakage detectors, earth leakage detectors, etc., only one slave unit 24 is illustrated for simplicity of explanation. .

The base unit 23 includes a coupling section 231, a transmitting section 232, and a transmitting section 232, as shown. Receiving unit 233. Zero cross detection section 234, display section 235. It is composed of an operating section 236 and a microprocessor 237 that drives and controls these components. The transmitting section 232 is controlled by the microprocessor 237 and outputs a high frequency signal based on the information as a carrier wave to the power line 22 via the coupling section 231. Further, the receiving section 233 converts the high frequency signal inputted through the coupling section 231 into a digital signal and supplies the digital signal to the microprocessor 237. The zero cross detection section 234 detects the zero cross point of the power supply waveform a shown in FIG. 4, and sends a pulsed zero cross detection signal indicating the switching timing for each half cycle to the microprocessor 237.

The operation section 236 has 8 children ta 24 which are prioritized in advance.
It sets the priority order from which load information is to be received from the handset 24, and supplies the number of the setting order to the microprocessor 237. In addition, the display section 235
The load information received from each handset 23 is displayed.

When the microprocessor 237 sends a load information transmission request command to each child unit 24, it first prepares the command information, and then, when a zero-cross detection signal is input from the zero-cross detection section 234, the signal is input. from 3
After waiting for ms, the prepared command information C shown in FIG. 4 is output to the transmitter 232. Note that the reason for waiting 3+ms is to prevent the carrier wave from interfering with the detection of the zero-crossing point of the NrfA waveform a. The command information sent from this microprocessor 237 is the frame synchronization signal FS as shown in d of FIG. 4 mentioned above.

As a result, a power waveform a is generated on the power line 22, as shown in FIG. 4, in which a carrier wave indicating a command is superimposed on the first half of a half cycle.

The microprocessor 237 operates on the operating section 2 of the power waveform a.
36, the next frame synchronization signal FS is sent to the power line 22 after half the number of cycles of the priority number set in 36 has elapsed.
Send to. For example, when the priority number is set to 6 on the operation unit 236, the frame synchronization signal FS is transmitted every 3.5 cycles of the power waveform a, as shown in FIG.

The children t124 each include the connecting portions 231 . of the parent t123. Transmission unit 232. A coupling section 241 having the same circuit configuration as the receiving section 233 and the zero-cross detecting section 234. Transmission unit 242. A receiving section 243 and a zero-cross detecting section 244 are provided. And these parts 241, 242, 2
43 and 244 are controlled by a microprocessor 245. The microprocessor 245 also includes a power line 2.
A load to which power is supplied from 2 and a detection signal as load information from a detector 25 at the curvature are input. This detector 2
5 sends out an L level signal when normal, and sends an H level abnormality detection signal when an abnormality is detected.

The microprocessor 245 reads information inputted from the power line 22 through the coupling section 241 and the receiving section 243, and constantly monitors a detection signal indicating the load condition from the detector 25 inputted to the input terminal.

When the microprocessor 245 is powered on, it is configured to execute load information transmission work according to the flowchart in FIG. 2. That is, the signal level of the input terminal to which the detection signal from the detector 25 is input is checked.

If the normal state is at L level, this process is returned to the beginning. When an abnormality detection signal of H level indicating an abnormality is input from the detector 25, it waits for the input of a frame synchronization signal FS indicating a command sent from the base unit 3 which is input from the power line 22. When the frame synchronization signal FS is input, the number of pulses of the zero cross detection signal shown in FIG. 4 sent from the zero cross detection section 244 is counted from the time when the frame synchronization signal FS is input. When the counted number matches the priority number set in advance for itself, it is determined that the transmission order of its own load information has come, and an abnormality detection signal is sent to the transmission section 242 as load information. Therefore, on the power supply waveform a, a carrier wave of load information indicating an abnormality is superimposed on the half cycle of the priority number from the frame synchronization signal FS.

If the next frame synchronization signal FS is input before the count value reaches its own priority number after the frame synchronization signal FS is input, the own load information is changed to 1161.
It is determined that there is no need to send the data to 3, and this process is returned to the beginning.

In the power line carrier control system configured in this way, for example, when omitting load information from a low-priority slave unit 24 to which a less important detector 25 is connected among all children 11124, the parent I23 The user inputs the lowest priority number of the handsets 23 to be displayed on the display unit 235 from the operation unit 236 of the user. Then, the frame synchronization signal FS is transmitted to each slave device 24 via the power line 22 every half the number of cycles of the priority number set as described above. Therefore, even if the frame synchronization signal FS is input to the slave device 24 whose priority is lower than the priority number set on the operation unit 236 of the parent vs. Since the next frame synchronization signal FS is input by the time the frame synchronization signal FS is reached, it is not possible to send its own load information to the power line 22.

In this way, the number of child devices 24 that send load information to the parent device 8!23 can be arbitrarily limited in advance on the L1 device 23 side in descending order of priority. Therefore, it is possible to display important load information on the display unit 235 in short cycles.
When an abnormality occurs, countermeasures can be taken quickly and the reliability of the entire system can be improved.

In addition, the number of load information to be displayed on the display unit 235 can be set by the operation unit 23.
6 can be set arbitrarily as needed, so it is possible to display the load information of the loads (detectors 25) connected to all the child m24s over time, and only the load information of important comics can be displayed. It is also possible to display it in short cycles.

[Effects of the Invention] As explained above, according to the present invention, priority is given to the transmission order of load information transmitted from each slave device, and! One device can stop sending out load information from slave devices with lower priority as needed.

Therefore, important load information can be checked at short time intervals, and the reliability of the entire system can be improved.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a power line carrier control system according to an embodiment of the present invention, FIG. 2 is a flow diagram showing the operation of the same embodiment, FIG. 3 is a block diagram showing the overall system configuration, and FIG. The figure is a diagram of transmission waveforms in the same system. 21...Commercial AC power supply, 22...Power line, 23...
・Main unit, 24...Slave unit, 25...Detector (load),
231°241...Coupling section, 232,242...Transmitting section, 233.243...Receiving section, 234.244.
... Zero detection unit, 235... Display unit (output device), 236... Operation unit, 237.245... Microprocessor. Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (1)

[Claims] A base unit having a transmitting unit, a receiving unit, and a data processing unit and a plurality of slave units each having a transmitting unit, a receiving unit, and a data processing unit are connected to a power line of a commercial AC power source, and a load information transmission request is sent from the base unit. The command is superimposed on the power supply frequency using a high-frequency signal as a carrier wave and is transmitted over the power line, and each slave unit receives the carrier wave and transmits load information indicating the status of the load connected to each slave unit over the power line. In the power line carrier control system, the base unit sequentially receives carrier waves from each slave unit, reads load information from each slave unit, and outputs the load information from an output device. Means for setting the load information transmission order in a preset priority order for each slave device, and a command for requesting the next load information transmission before the base device receives load information from a slave device with a lower priority. means for transmitting the load information, and means for stopping the transmission of the load information if each slave device does not have a priority for transmitting its own load information between receiving the command and receiving the next command. A power line transport control system characterized by comprising: