JPS644705B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power supply control device that controls the power supply and operating state of a terminal device connected to a center via a data line.

BACKGROUND ART Conventionally, data communication systems have been known that have a so-called remote power control function that turns on and off the power of terminal devices based on commands from a center. However, in such a data communication system, it is necessary to keep the transmission control device, etc. of the terminal device constantly operating in order to receive power-on commands from the center even when the terminal device's power is cut off. There was an inconvenience that power was wasted. In order to eliminate such drawbacks, in the past, power was always supplied, and when the terminal device was powered off, it was connected to the communication line via a circuit switching means, and when it received a power-on command from the center, it A power supply control device that sends a power-on signal to the terminal device and drives a line switching means to switch the communication line to the terminal device is interposed between the center and the terminal device.

In conventional power supply control devices, after a certain period of time has elapsed after receiving a power-on command from the center and sending a power-on signal to the terminal device, the communication line is switched to the terminal device side, assuming that the terminal device starts operating. ing. However, if the power to the terminal device is not turned on due to an instantaneous power outage or failure of the terminal device, the polling from the center cannot be responded to, and the terminal device must be powered on manually. Further, although it is not necessary to always supply power to the transmission control device inside the terminal device, there is a problem in that power must be constantly supplied to the power supply control device, which wastes power. Furthermore, since it is not determined whether the response is being made normally, there is a drawback that an abnormal state cannot be identified.

Problems to be Solved by the Invention The present invention has been made in view of the problems of conventional power supply control devices, and it detects the start of operation of a terminal device without using a special signal line etc. The technical challenge is to be able to control the power supply.

Means for Solving the Problems The first invention of the present application includes a reception communication line 5R that connects the center and the terminal device 6 and receives signals from the center, and a transmission communication line 5S that sends signals to the center. A power supply control device comprising a switching means 4 for switching the connection of the receiving signal line and a control means 3 for controlling power-on of the terminal device based on a power-on signal from the center. connected to the terminal device and the signal input end of the control means,
In the first switching state, the signal from the center is given to the control means and the terminal device, and in the second switching state, the signal is given to the terminal device.The first switching circuit 4-1 provides the transmission output terminal of the terminal device and the control a second switching circuit 4-2 which is controlled by the signal input terminal of the control means and which supplies a response output of the terminal device to the control means in the first switching state, and is connected to the transmission output terminal of the control means and the transmission communication line; The third switching circuit 4-3 provides a response from the control means to the center in the first switching state, and the control means receives a polling signal from the center in the first switching state of the switching means. After that, a response detection means detects a response from the terminal device given through a second switching circuit, and when a response is not detected by the response detection means, a response is sent to the transmission communication line via a third switching circuit of the switching means. response sending means for sending out a response signal to the switching means; when the power is turned on, each switching circuit of the switching means is switched to the first switching state, and when a response is detected by the response detection means, each switching circuit of the switching means is switched to the first switching state; The present invention is characterized by comprising a switching control means for switching from the first switching state to the second switching state, and a power cutoff means for cutting off the power to the power supply control device after the switching control means switches to the second switching state.

Moreover, the second invention of the present application includes, in place of the power cutoff means of the first invention, switching control means for switching each switching circuit of the switching means to the first switching state when the power is turned on;
and an abnormality transmitting means for determining whether the terminal device responds normally to a signal from the center and transmitting an abnormality to the center in the event of an abnormal response.

Operation In the first invention of the present application having such characteristics, when the power to the power supply control device is turned on, each switching circuit of the switching means becomes the first switching state, and the signal given from the center controls the control of the power supply control device. means and terminal equipment at the same time. Further, the output signal from the terminal device is switched so as to be given to the control means of the center and terminal control device. When a polling signal is received from the center, the power supply control device waits for a response signal from the terminal device, and if there is no response signal, it sends a response signal instead.
When a terminal device power-on signal is given, the terminal device is powered on, and if a polling signal is subsequently transmitted, it continues to wait for a response signal from the terminal device, and if there is no response, a response signal is sent instead. When a response from the terminal device is detected, the communication line by the switching control means is disconnected from the power supply control device, each switching circuit of the switching means is placed in the second switching state, and the communication line is disconnected from the control means. Then, the power to the power control device is cut off. In this way, the terminal device and the center will be directly connected from now on.

Also, in the second invention of the present application, when the power supply control device is turned on, each switching circuit of the switching means becomes the first switching state, and the signal given from the center is given to the control means of the power supply control device and the terminal device at the same time. It will be done. Further, the output signal from the terminal device is switched so as to be given to the control means of the center and terminal control device. When a polling signal is received from the center, the power supply control device waits for a response signal from the terminal device, and if there is no response signal, it sends out a response signal on its behalf, and when a power-on signal from the terminal device is given, the power supply control device Turn on the device and
Subsequently, if a polling signal is sent out, it continues to wait for a response signal from the terminal device, and if there is no response, a response signal is sent out instead. After a response signal is sent from the terminal device, it is determined whether the response signal is normal or not, and if there is an abnormality in the terminal device, the abnormality is sent to the center.

Effects of the Invention Therefore, in the first invention of the present application, the power supply of the terminal device can be controlled based on the response signal of the terminal device, and it can respond to the center by itself, so the reliability of the system is improved and reliable operation can be achieved. You can make it happen. Then, after confirming that the terminal device has started operating, the power to the own device is stopped, so the power is turned on only from the time the power control device is turned on until the terminal device starts operating. becomes. Therefore, it is possible to save power without consuming unnecessary power.

Further, according to the second invention of the present application, it is possible to control the power supply of the terminal device based on the response signal of the terminal device and respond to the center by itself, thereby improving the reliability of the system and ensuring reliable operation. can. Furthermore, it is possible to continuously monitor transmission failures by identifying whether or not the terminal device is responding normally.

DESCRIPTION OF EMBODIMENTS FIG. 1 is a schematic block diagram showing the connection state of a power supply control device to a center and a terminal device. In this figure, a power supply control device 1 is composed of a central processing unit (hereinafter referred to as CPU), a control circuit 3 that includes a memory for storing its processing procedure, and controls a relay and a terminal device to be described later, and a switching contact of a relay 2. The switching circuit 4 includes a switching circuit 4. A common contact of the switching circuit 4 is connected to a center (not shown) via a communication line 5, and the connection of the communication line 5 is switched between the power supply control device 1 itself and the terminal device 6. The terminal device 6 has a CPU (not shown) and a storage device for storing its processing procedure, and has a transmission section 7, a control section 8, and a power supply device 9 that are controlled by the CPU. The transmission section 7 is connected to a normally closed contact of the switching circuit 4 via a transmission line 10, and the power supply device 9 is connected to the control device 3 via a power control line 11.

FIG. 2 is a circuit diagram showing detailed configurations of the power supply control device 1 and the terminal device 6. As shown in FIG. In this figure, a relay 2 switches a switching circuit 4 to a first switching state and a second switching state, respectively, by energizing and deenergizing the relay 2. The switching circuit 4 has three switching circuits.
The first switching circuit 4-1 has its common contact c1 connected to the communication line 5R on the receiving side, and its normally closed contact b1 connected to the receiver R1 in the transmission section 7 of the terminal device 6 via the transmission line 10R. The normally open contact a1 is connected to the receiver R1 through the receiver R2 and transmitter T2 in the power supply control device 1. Therefore, in the first switching state in which the power is turned on, a signal from the center is given to the power supply control device 1 and the terminal device 6 simultaneously, and in the second switching state, the signal from the center is given only to the terminal device 6. The transmitter T1 of the transmission section 7 is directly connected to the communication line 5S via the transmission line 10S, and is also connected to the normally open contact a2 of the second switching circuit 4-2 of the switching circuit 4. The common contact C2 of the two is applied to the received signal input terminal 3a of the control circuit 3 via the receiver R3. Terminals 3b and 3c of control circuit 3 are relay 2
The terminal 3d is connected to the common contact C3 of the third switching circuit 4-3 of the switching circuit 4 via the transmitter T3. The normally open contact a3 of the third switching circuit 4-3 is the transmission communication line 5S
It is connected to the. Further, the output terminal of the receiver R2 is connected to a terminal 3e, and the terminal 3f is connected to a driving transistor Tr. The transistor Tr drives the relay X of the power supply control 9 via the power supply control line 11. FIG. 3 is a circuit diagram showing the detailed configuration of this power supply device 9. As shown in FIG. In this figure,
Normally open contact x of relay X and momentary switch 1
2 is connected to the set input terminal of keep relay X ₁ via an OR circuit 13 for setting.
The other contact of momentary switch 12 and a power-off signal line from a CPU (not shown) are connected to a reset input terminal of keep relay _X1 via a reset OR circuit 14. momentary switch 1
Reference numeral 2 is used to manually turn on and off the power to the terminal device 6, and is normally in a neutral position, giving a set signal to the keep relay _X1 when the power is turned on, and a reset signal when the power is turned off. Relay contacts for keep relay x ₁
Relay X ₂ is connected to x ₁ . The power supply 15 drives the keep relay _X1 and the relay _X2 , and is constantly supplied with power. The power supply 16 supplies power to the terminal device 6, and the normally open contact x ₂ of the relay X ₂ is connected to the input line of the power supply 16, and the power supply 16 is controlled by the relay X ₂ .

Next, the operation of the power supply control device according to this embodiment will be explained using a flowchart. In addition to controlling power-on of terminal devices based on power-on commands from the center, this power supply control device can also be used as a terminal transmission failure monitoring device that monitors transmission failures after the terminal devices start operating. . FIG. 4 is a flowchart showing the former operation. In this figure, in step 20, the power supply control device 1
Manually turn on the power in advance. Then, the relay 2 is energized and the common contacts C1, C2, C3 of the switching circuit 4 are connected to the normally open contacts a1, a2,
It is connected to the a3 side and enters the first switching state (step 21). In this state, the communication line 5R is connected to the control circuit 3 via the receiver R2, and further connected to the terminal device 6 via the transmission line 10R via the transmitter T2. Further, the transmission line 10S is connected to the communication line 5S, and further connected to the second switching circuit 4.
-2 to be connected to the control circuit 3. Next, in steps 22 and 23, it is checked whether there is a polling signal (indicated as POL in the flowchart) directed to the local station or a terminal power-on signal among the signals sent from the center. The signal from the center is given to the control circuit 3 via the first switching circuit 4-1 and to the transmitter T.
2 to the terminal device 6 as well. Therefore, the power supply control device 1 repeats steps 22 and 23 and waits for a signal from the center, but if there is a polling signal addressed to its own station, it first checks in step 24 whether there is a response signal from the terminal device 6. . If there is no response, it is determined that the terminal device 6 is not powered on at the end, and the power supply control device 1 sends out a response signal on behalf of the terminal device 6 (step 25), and the process returns to step 22. If a terminal power-on signal is received from the center, relay X is energized via power control line 11 in step 26. Then, keep relay _X1 is set, relay _X2 is energized, and the terminal device 6 is powered on. Subsequently, in step 27, the polling signal addressed to the local station is checked again. If there is a polling signal, a check is made in step 28 to see if there is a response from the terminal device 6. Since a certain amount of time, such as initial setting processing, is required after the terminal device 6 is powered on (step 26) until it can respond to the center, it may not be able to respond even if there is polling. Therefore, if the terminal device does not respond in step 28, the power supply control device 1 sends out a response signal on its behalf (step 28).
9), return to step 27. Here, the control circuit 3 constitutes a response detection means for detecting a response from the terminal device after being given a polling signal from the center in steps 22, 24 and 27, 28, and steps 25 and 29 constitute a response detection means. The function of the response signal sending means is achieved by sending a response signal to the center to the transmission communication line when no response is detected. The response signal from the terminal device 6 is sent to the control circuit 3 via the transmission line 10S, the contacts a2 and c2 of the switching circuit 4, and the receiver R3.
given to. Therefore, if the terminal device 6 issues a response signal in step 24 or 28, it can be determined that the terminal device 6 is operating normally. Therefore, in step 30, the relay 2 is deenergized and the communication line 5 and transmission line 10 are connected as shown in FIG.
and disconnect the control circuit 3 from the communication line 5.
Thereafter, the power of the power supply control device 1 itself is turned off (step 31) to stop its operation.

Here, the control circuit 3 performs steps 20, 21, and 30.
The switching control means functions to switch the switching circuit of the switching means to the first switching state when a response is detected by the response detection means. Also, step 31
achieves the function of a power cutoff means for cutting off the power to the power supply control device after the switching control means switches to the second switching state.

In this way, the power supply control device will not waste power from now on, and it is possible to save power.

Next, the second invention of the present application will be explained based on examples. In the second embodiment, the power supply control device 1 is used as a device for monitoring transmission failures of terminals, and the configuration shown in FIGS. 1 to 3 is the same as that of the first embodiment described above. be.
FIG. 5 is a flowchart showing the operation of the second embodiment. In FIG. 5, steps 20 to 29 are the same as the operations in FIG. 4, so their explanation will be omitted. If the terminal device 6 issues a response signal in step 24 or 28, the terminal device 6 responds to the signal from the center in step 32.
monitor whether it responds normally. If there is a normal response, the process advances to step 33 to check whether the signal from the center is a power-off signal for the terminal device 6. If not, the process returns to step 32, and thereafter the loop of steps 32 and 33 is repeated to continue monitoring the terminal device 6. If there is an abnormality such as the terminal device 6 not responding to a signal from the center within a predetermined time, the control circuit 3 sends the abnormality of the terminal device 6 to the center in step 34. Here, the control device 3 achieves the function of an abnormality sending means that determines whether the terminal device responds normally to a signal from the center, and sends an abnormality to the center in the event of an abnormal response. Further, if there is a power cutoff signal from the center, the terminal device 6 turns off the power accordingly (step 35), so the process returns to step 21 and the same process is repeated thereafter.

In this way, by continuing to operate the power supply control device 1 even after the terminal device 6 is activated, it becomes possible to continuously monitor the transmission failure of the terminal device 6.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the connection state of the power supply control device to the terminal device and the center, Fig. 2 is a circuit diagram showing an embodiment of the power supply control device according to the present invention and the configuration of the terminal device, and Fig. 3 is a circuit diagram showing the power supply device in the terminal device, and FIGS. 4 and 5 are flowcharts showing the operation of the power supply control device. 1... Power control device, 2, X, X ₁ , X ₂ ... Relay, 3... Control circuit, 4... Switching circuit, 5...
Communication line, 6...terminal device, 9...power supply device, 1
0...Transmission line, 11...Power control line, 1
5,16...Power supply.

Claims (1)

[Scope of Claims] 1. Switching means for switching connections between a receiving communication line connecting a center and a terminal device and receiving signals from the center, and a transmitting communication line sending signals to the center; A power supply control device comprising: control means for controlling power-on of the terminal device based on a power-on signal of the terminal device; a first switching circuit connected to an input terminal, which provides a signal from the center to the control means and the terminal device in a first switching state, and provides the signal to the terminal device in a second switching state; a second switching circuit that is controlled by a transmission output terminal of the device and a signal input terminal of the control means, and in a first switching state provides a response output of the terminal device to the control means; and a transmission output terminal of the control means; a third switching circuit connected to the transmission communication line and configured to provide a response of the control means to the center in the first switching state; the control means: in the first switching state of the switching means response detection means for detecting a response from the terminal device provided via a second switching circuit after a polling signal is provided from the center; response sending means for sending a response signal to the center to the transmission communication line via the switching circuit of No. 3; and switching each switching circuit of the switching means to the first switching state when the power is turned on, and the response detection means switching control means for switching each switching circuit of the switching means from a first switching state to a second switching state when a response is detected; and a power supply of the power supply control device after switching to the second switching state by the switching control means. A power supply control device comprising a power supply cutoff means for cutting off the power supply. 2. A switching means for switching the connection between a receiving communication line connecting the center and a terminal device and receiving signals from the center, and a transmitting communication line sending signals to the center, and and a control means for controlling power-on of the terminal device, the switching means being connected to the reception signal line and the signal input terminal of the terminal device and the control means, a first switching circuit that provides a signal from the center to the control means and the terminal device in a first switching state, and provides the signal to the terminal device in a second switching state; a transmission output terminal of the terminal device; a second switching circuit that is controlled by a signal input terminal of the control means and that in a first switching state provides a response output of the terminal device to the control means; and a transmission output terminal of the control means and the transmission communication line. a third switching circuit that is connected to the center and provides a response from the control means to the center in the first switching state; and the control means receives a polling signal from the center in the first switching state of the switching means. response detection means for detecting a response of the terminal device provided via a second switching circuit after the response is given; response sending means for sending a response signal to the center to the transmission communication line; switching control means for switching each switching circuit of the switching means to a first switching state when power is turned on; 1. A power supply control device comprising: abnormality sending means for determining a normal response of a terminal device and sending an abnormality information to the center in the event of an abnormal response.