JPS59112741A - Remote monitoring device - Google Patents

Abstract

PURPOSE:To detect >=2 addresses of terminals being superposed by providing a main console panel with a malfunction discrimination part which detects the current variation point of a return signal from a terminal and discriminates whether plural return signals are superposed or not. CONSTITUTION:The main console panel 1 sends respective addresses to plural terminals 2 cyclically, and each terminal returns a coincidence signal to the main console panel when its address coincides with the received address. When the same address is set to two terminals erroneously at a time, coincidence signals appear overlapping with each other. In this case, the current transformer T1 of the malfunction decision part 14 provided to the main console panel detects a voltage proportional to the variation di/dt of a signal current flowing through a signal line 3b. Then, whether this signal and its inverted signal generated by inversion OP1 have a specific voltage or not is detected CP2 and CP1, and detection pulses are added OP2 and counted by a counter CO. When the counted value is larger than a specific value, a detecting circuit 15 judges that the same adress is superposed to plural terminals and outputs a superposed setting signal DA.

Description

[Detailed description of the invention] The present invention relates to a remote monitoring device.

Figure 1 shows the schematic configuration of a conventional remote monitoring and control device.
A large number of terminal devices (2) are connected to a pair of signal lines (, 3a) (3b) connected to the main operation panel f1), and each terminal device (2) is connected to the main operation panel f1). ) to perform remote monitoring and control. A unique address is set for each terminal tz+, and since the address is used to identify all terminals (2), one device should originally have two terminals (2) with the same address. There is no way to connect everything.

However, if the address setting switch on the terminal (2) is operated incorrectly during installation, the same address may be set on two or more terminals (2). Since the timing of the return signals overlaps, the main operation panel fil cannot correctly identify the return signals, and there is a problem in that it is not easy to tell whether there is an error in the address setting of the terminal (2). That is, as shown in Figure 2, the transmission signal (■8) sent from the main operation panel fll is a start signal (ST) consisting of a wide pulse, and an address for transmitting address data for calling the terminal (2). A waiting period for a signal (AD), a control signal (CD) that transmits control data for a load (not shown) connected to the terminal (2), and a return signal (VB) from the terminal (2) It consists of a long number for waiting for a return to be set and a Russ @ number (WP), and it is configured to send cyclically to each address.The transmission @ number (VB) is a bipolar signal (AC signal). ) is transmitted as
The pit value "1" is a wide pulse, and the pit value rOJt-
This is a pulse modulation signal with a narrow width pulse.

The configuration of the main operation panel +1) is shown in Figure 3.
10) a transmission signal creation unit that creates a transmission signal (vs);
(Ill is the transmission signal generation unit [0) and the try section that amplifies the output power and sends it to the signal lines (3a) (3b), 02) is the voltage (V) across the current detection resistor (r). A returned signal discriminator (13) is a received signal processor, which is composed of a comparator that compares the reference voltage (vf).

On the other hand, the configuration of the terminal device (2), as shown in the same figure, includes the address data of the transmission signal (■8) and the control data of the transmission signal (V8) in the address setting slot, and the load control signal (
The load control unit (21) outputs the signal line (3a) (3a) during the period of the long pulse signal (WP) for waiting for the return of the transmission signal (v8) when the address matching signal is obtained.
b) A return unit that sends out a return signal (VB) for returning monitoring data as a current signal by appropriately short-circuiting between the two via an in-heater system element (R). In the figure (2
3) is a return signal generation unit that creates a return transmission J8 (VB) that returns monitoring data based on the monitoring input (■・), (0 is a transisister for switch shift, and (DB) is a diode bridge for full-wave rectification. It is.

The transmission signal (v8) now sent from the main operation panel (1)
The called terminal (2) whose address data matches its own address transmits the load control key (Vo) from the load controller (2υ) based on the control data of the transmission signal (■S)
)'i- output, and the return signal (VB) that returns the monitoring data (6 pits including parity pits in the embodiment) formed based on the monitoring input (V, ) is shown in FIG.
As shown in b), during the period of the long pulse signal < wp > for waiting for the return of the transmission signal (VB) (during the %HR level period)
It is then sent out as a current signal to the signal lines (3a) and (3b).

Next, on the main operation panel 11), the voltage (V) across the current detection resistor (r) is input to the return signal discriminator (12).
As shown in figure (a), the voltage at both ends ('V) is the reference voltage (
V, ), that is, the signal lines (3a) (3b
) is short-circuited through the impetus system element (R) and a large current of more than a predetermined value flows through the line (3a) and (3b), the H level is output.
The output (VB) of this return signal generator is received (input to the m-signal processing unit (13), and the data value rlJ, [0] is determined based on the length and shortness of the high-level section, and the end signal generator ( 2)
The status of the monitoring human power (V) will be recognized on the main operation panel ill.

By the way, in such a conventional example, if the addresses of two or more terminal devices (2) that should originally be set to different addresses are set to the same address due to an operation error of the address setting switch (sA), the main operation Two or more terminals (2) respond simultaneously to a call from the board jl), and for example, as shown in FIG. ) superimposed signal (VB12)
will be returned. In this case, the returned signal discriminator 0
In 2), the comparator only determines whether the voltage (V) across the current detection resistor (r) is higher than the reference voltage (V,), so the return data from the two terminals (2) Even though the signals (VBl) (VB2) are superimposed and sent back, only one terminal (2) is sent on the main operation panel tll.
The problem has been that it is recognized as a return signal (VB) from the terminal, and it is not known that the same address is set on two or more terminals (2).

Note that FIG. 4(b) shows a case where a return signal (vBl) (VB2) that returns the same monitoring data from each terminal (2) is superimposed, and the synchronization between each terminal (2) is Although the rising and falling edges of each pulse signal are slightly different due to the lack of accuracy, the return signal (VBL
) or (VB2), but a return signal (VB,) that returns different monitoring data
(VB2) is superimposed and returned, both return signals (
It goes without saying that the monitoring data of VBl) (VB2) is incorrectly recognized. The present invention has been made in view of the above-mentioned points, and its purpose is to make it possible to easily detect on the main operation panel that the addresses of two or more terminal devices are set in duplicate. The purpose of the present invention is to provide a remote monitoring device.

Examples will be described below using figures. Fig. 5 shows a circuit diagram of the main part of one embodiment of the present invention, and 04) detects the current change point of the return signal (VB) and multiple return signals (VB) are superimposed. This is a malfunction determination unit that makes all determinations, and detects changes in the signal current flowing through the signal line (3b) (
A current transformer (
Ti), the operational amplifier for signal inversion (OF+), the output (va) of the current transformer (Ti), and the operational amplifier -) (
A comparator (CP+) (CF2) detects whether the output (V5) of OF+) is higher than a predetermined voltage, and the output (VC
)(Vd)' -r operation'P'X15(OP
2) and, for example, a counter (CO) which is reset by the start signal (ST) and increases the output (ve) of the operational amplifier (OP2), and a counter (co) output (Vf) pre-output circuit (I5). It is formed by.

FIG. 6 shows the operation of the embodiment shown in FIG.
(b) in the same figure if there is no address duplication of terminal device (2)
shows the respective outputs (va) to tv8) 1 when return signals (V, ) (VB2) are returned simultaneously from two terminal devices (2) with duplicate addresses. Now, in the case where there is no duplicate address of terminal device (2), signal line (
3b) The time point at which the signal current flowing through changes is the return signal (VB)
Each pit of the monitoring data corresponds to the rising and falling points of the pulse signal to be sent back.In this embodiment, since the monitoring data consists of 6 pits, the operator'J program (OP2
) The number of pulses output from
become individual. On the other hand, when the addresses of two terminal devices (2) overlap, the time point at which the signal J8 current changes is the return signal (vBI) (VB□) sent back from each terminal device (2).
This corresponds to the rise and fall of , and in this embodiment, the number of change points is 24. Therefore the counter (CO)
When the output (vOo) becomes 13 or more, the address duplication detection circuit θ5) outputs an address duplication signal (DA). As described above, in the embodiment shown in FIG.
The address duplication signal (DA) is output from the main operation panel Qj side (B, B2) to notify everyone that the return signal (V') (V) is superimposed. )
Address duplication can be easily detected and malfunctions can be prevented.

FIG. 7 shows all other embodiments, in which a pulse corresponding to the current change point of the return signal (VB) is outputted.
The output (V)' of the output (OP2) is set to D, and the voltage (Vr)k across the current detection resistor (r) is connected to the data input terminal.
A shift register (SR) is provided in place of the counter (CO) in the embodiment of FIG. This is provided in the exclude-jevenor circuit (EN)' which takes the first and second bits of (Vh) as input, and the shift register (SR) outputs (Vh).
When both the first and second pits are rlJ, an address duplication signal (DA) is output from the external circuit (EN). That is, in the embodiment of FIG. 7, the current level signal (V) at the time of current change is sequentially stored in the shift register (SR), and as shown in FIG. 8(a), the current level signal (V) is (V) If the link value is alternately shifted at the cooperative H level and the data read into the register (SR) is a repetition of "1" and "0", a normal return signal with no address duplication ( V
B), and as shown in FIG. 8(b), the simulator value of the current level signal (■,) is continuously at H" level, and the data read into the shift register (SR) is continuously at Ill. If , the addresses of 2 or more terminals + 21 are duplicated, and the superimposed return signal ('vB12)
It is determined that the item has been returned. In FIG. 7, (OP3) to (OP6) are au pairs and J.

The present invention is configured as described above, and cyclically sends a transmission signal from the main operation panel to each address, which includes an address signal for transmitting address data for calling a terminal, and a long pulse signal for waiting for a return. In a remote monitoring device that sends out a return signal for returning monitoring data as a current signal during the period of a long pulse signal for return standby from the called terminal, all points of current change in the return signal are detected and multiple points are detected. This system is equipped with a malfunction detection section that determines whether or not return signals are superimposed, and the main operation panel detects the point in time when the current changes and determines whether multiple return signals are superimposed. Therefore, the key point is that the main operation panel can easily detect that the addresses of two or more terminal devices are set in duplicate.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a diagram showing a schematic configuration of a remote monitoring device according to the present invention, Fig. 2 is a diagram showing a transmission signal and return signal of the same, and Fig. 3 is a block circuit diagram of a conventional example. , FIG. 4 is an explanatory diagram of the same operation as above, FIG. 5 is an essential circuit diagram of one embodiment of the present invention, FIG. 6 is an explanatory diagram of the same operation, and FIG. 7 is an essential circuit diagram of another embodiment V. , FIG. 8 is an explanatory diagram of the same operation. ! 11 u Main operation panel, (2) terminal device, (3a) (3b
) is a signal line, (4) is a malfunction determination section, (b) is an address match detection section, and (3) is a reply section. Agent Patent Attorney Ishi 1) Long 7th Procedural Amendment (Spontaneous) January 23, 1980 Patent Application No. 199'? 04 No. 2, Name of the invention Remote monitoring device 3, Relationship with the amended person case Patent applicant Location 1048 Oaza Kadoma, Kadoma City, Osaka Name (583) Matsushita Electric Works Co., Ltd. Representative Iku Kobayashi 4, Agent Postal code: 530 Voluntary, -
7. Figure No. 7 in the attached drawings of the application is corrected as shown in the attached sheet.

Claims (1)

[Claims] +1j Connect the main operation panel and multiple terminal devices with a pair of signal lines, and send a transmission signal from the main operation panel that includes an address signal that transmits address data for calling the terminal device and a long pulse signal for waiting for a return. An address match detection unit that outputs an address match signal when the address data of the number - and its own address match, and transmits the address match signal when the address match signal is obtained. The remote controller is equipped with a return unit that sends out a return signal as a current signal by short-circuiting the signal lines via an ishipetance element as appropriate during the period of the long pulse signal for waiting for the return of the signal. What is claimed is: 1. A remote monitoring device, characterized in that the main operation panel is provided with a malfunction discriminating section that detects the point in time when a current of a return signal changes and determines whether a plurality of return signals are superimposed or not.