JP2838847B2 - Terminal for remote monitoring and control system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal of a remote monitoring control system that samples an input and reads the input as an input when the input state has not changed a predetermined number of times.

[Prior Art] Conventionally, in a terminal device used in a remote monitoring and control system, as a countermeasure against switch chattering and pulse noise, if the input levels do not match twice with 20 ms sampling as shown in FIG. Was not processed. If sampling is performed in this way for 20 ms, it is determined that the input has changed only after a lapse of up to 40 ms after the input state has changed, so if this terminal is used for handshaking between microcomputers, the response speed will be slow. turn into. That is, when the output of the microcomputer is used as an input, chattering can be ignored, and the delay of the response speed becomes more problematic.

Conversely, for example, when this terminal device is used as a wall switch, an input of 20 to 40 ms is detected as an input.
When the switch is accidentally touched as shown in FIG. 9A, an erroneous operation of reading an input and turning on and off the illumination as shown in FIG. If the lighting in this case is a fluorescent lamp or an incandescent lamp, it can be immediately returned to the original state by operating the switch again.
In the case of HID lighting (mercury lamp), once turned off, there is a problem that it cannot be turned on again. Therefore,
Conventionally, a wall switch for controlling lighting in a gymnasium or the like was provided with a cover.

[Problems to be Solved by the Invention] The present invention has been made in view of the above points, and an object of the present invention is to provide a terminal of a remote monitoring control system capable of appropriately changing an input reading state. Is to provide.

Means for Solving the Problems In order to achieve the above object, the present invention provides a signal processing unit which samples an input and reads the input as an input when the input state does not change a predetermined number of times, and an output of the microcomputer as an input. In the case where the sampling time is short, the sampling time of the signal processing unit is variably set so that the sampling time is shortened, and when the output of the switch is input, the sampling time is lengthened.

[Operation] According to the present invention, by providing a signal processing unit and a sampling setting unit in a terminal device as described above, when an input signal changes due to chattering of the input signal or generation of pulse noise, the signal processing unit outputs the input signal. As it is not read as, the input signal chattering and pulse noise can be ignored, and a stable input signal can be obtained. The sampling time of the signal processing unit is variably set so as to increase the sampling time when the output of the microcomputer is used as input, and the chattering can be ignored when the output of the microcomputer is used as input. In this case, the response speed can be increased. By increasing the delay time, input chattering can be ignored as noise, and input chattering can be ignored without reducing the response speed of the terminal.

[Example] Fig. 4 shows a schematic configuration of a remote supervisory control system, a central control unit 1, a plurality of monitoring terminal device 2 for monitoring the switches S ₁ to S ₄ unique address is set, the load L _{1 to} L ₄
, A wireless relay terminal 7, an external interface terminal 8, and a pattern setting terminal 9 are connected by a pair of signal lines 4. The transmission signal Vs sent to
As shown in FIG. 5 (a), a start pulse signal ST indicating the start of signal transmission and a mode data signal M indicating a signal mode.
D, address data signal AD for transmitting 8-bit address data for calling a terminal unit 2,3,7～9, control data signal CD for transmitting the control data for controlling the load L ₁ ~L _4, check sum data signal CS And a multi-pole (± 24V) time-division multiplexed signal composed of a return waiting signal WT for setting a return period from the terminals 2, 3, 7 to 9, and data is transmitted by pulse width modulation. I have. Each of the terminals 2, 3, 7 to 9 takes in control data of the transmission signal Vs when the address data of the transmission signal Vs received via the signal line 4 and the own unique address data match, and transmits the data. The monitor data signal is returned as a current mode signal (a signal transmitted by short-circuiting between the signal lines 4 via a suitable low impedance) in synchronization with the return standby signal WT of the signal Vs. The central control unit 1 also includes a dummy signal transmitting means for constantly transmitting a dummy transmission signal in which the mode data signal MD is set to the dummy mode, and any one of the monitoring terminal 2 or the wireless relay terminal 7 and the external interface terminal. 8, the fifth returned from the pattern setting terminal 9
When an interrupt signal Vi as shown in FIG. 7B is received, the interrupt generation terminals 2, 7 to 9 are detected and the external terminals 2, 7 are detected.
And an interrupt processing means for accessing the 9 to return the monitoring data. The central control unit 1 also uses the monitoring data returned from the monitoring terminal 2 or the wireless relay terminal 7, the external interface terminal 8, and the pattern setting terminal 9 to the central control unit 1 as described above. And creates control data to be transmitted to the control terminal 3 that controls the corresponding loads L _{1 to} L ₄ , and transmits the control data to the control terminal 3 via the signal line 4 in a time-division multiplex manner. and controls the load L ₁ ~L _4.

The wireless relay terminal 7 is a terminal that relays data of an optical wireless system composed of an optical wireless transmitter Y, an optical wireless receiver X, and a wireless signal line 10, and transmits an optical signal transmitted from the optical wireless transmitter Y. The optical wireless receiver X receives the received data via the wireless signal line 10 and transfers the data to the central controller 1. The external interface terminal 8 is connected to an external control device 8a.
The pattern setting terminal 9 is a terminal that transfers pattern control data input from the data input unit 9a to the central control device 1. The monitoring terminal 2 and the control terminal 3 disposed in the distribution panel 6 or the relay control panel 6a have a distribution panel agreement size, and the control output thereof controls the remote control relay for load control. (Latching relay that can be turned on and off also by a hand switch) 5 is controlled.

FIG. 1 shows a terminal used in such a remote monitoring and control system. Note that all the terminals have the same configuration, and operate as a monitoring terminal or a control terminal according to data written in the data storage unit 13 that stores a unique address and the like. The transmission and reception of data with the central control unit 1 of the terminal is performed by the transmission / reception unit 12. For example, when the terminal unit is used for monitoring a wall switch, the operation state of the switch SW ₁ is monitored by the signal processing unit 11. return the monitoring data indicating the operation state of the switch SW ₁ when a call from. The light emitting diodes LD ₁ and LD ₂ each indicate the operation state of the switch SW. Further, this terminal device includes a light receiving unit 15 for receiving a confirmation signal which is an optical signal from the unique address confirmation device, and a light projecting unit 14 for transmitting address data stored in the data storage unit 13. The set unique address can be checked.

The sampling time of this terminal is set in the sampling setting section.
16 can be set arbitrarily. When the terminal device of this embodiment is used as, for example, a wall switch for controlling the operation of HID lighting, the sampling time may be set as long as, for example, 120 ms as shown in FIG. In this case, an input of about 100 ms is ignored as noise. That is, as shown in FIG.
If it is ms, an input of about 100 ms will be processed as an input. However, if the sampling time is set as shown in FIG. 2, the lighting will not be turned off by accidentally touching the switch SW. Note that the sampling time can be set as appropriate. Although the case where the sampling time is changed has been described in the above description, the same effect can be expected even if the number of times of sampling is changed.

By the way, in the above description, the case where the terminal device is used as a wall switch has been described. Of course, when the terminal device is used as a device that performs data transmission by handshaking between microcomputers (for example, the external interface terminal device 8 or the like). , Chattering and the like can be ignored, so that the sampling time may be set to, for example, 80 μs as shown in FIG. In this case, since the input change can be determined in a maximum of 160 μs, the response speed can be increased.

[Effect of the Invention] As described above, according to the present invention, a signal processing unit that samples an input and reads the input as an input when the input state does not change a predetermined number of times, and a sampling time when an output of a microcomputer is used as an input. Sampling means for variably setting the sampling time of the signal processing unit so as to shorten the sampling time and increase the sampling time when the output of the switch is used as an input. If the input signal changes due to the occurrence, the signal processing unit does not read the input signal, so that chattering and pulse noise of the input signal can be ignored and a stable input signal can be obtained. When using the output of the switch as input, shorten the sampling time. The sampling time of the signal processing unit is variably set so as to increase the sampling time. Chattering can be ignored when the output of the microcomputer is used as input, so the response speed can be increased by shortening the sampling time. In the case where the output of the switch is used as an input, by increasing the sampling time, the chattering of the input can be ignored as noise, and the chattering of the input can be ignored without reducing the response speed of the terminal. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a terminal device according to an embodiment of the present invention. FIGS.
FIG. 5 is a schematic configuration diagram of a remote monitoring control system, FIG. 5 is a signal format of the above, FIG. 6 is an explanatory diagram showing a conventional sampling operation, and FIG. 7 is an explanatory diagram of the above-mentioned problems. Reference numeral 6 denotes a sampling setting unit.

Claims (1)

(57) [Claims] 1. A central control unit is connected via a pair of signal lines to a monitoring terminal to which a plurality of switches or microcomputers set with unique addresses are connected and a control terminal to control a load, A signal used for a remote monitoring and control system that accesses each terminal from the central control unit to transmit monitoring data and control data in a time-division multiplex manner. The input is sampled and read as an input when the input state has not changed a predetermined number of times. The sampling time of the signal processing unit is variably set so that the sampling time is shortened when the output of the microcomputer and the output of the microcomputer are input, and the sampling time is lengthened when the output of the switch is input. A terminal device of a remote monitoring and control system, comprising: