JPS6359635B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure and function of a terminal device in a multiplex transmission system, and in particular to a device that enables operation instructions to be given from one terminal to another terminal far away without malfunction.

Various systems have been proposed as multiplex transmission systems, one example of which is the "multiplex transmission system" proposed by the present inventor (Japanese Patent Application Laid-Open No. 59-1999).
62246). Here, in a transmission system in which a plurality of terminals and a center unit are connected via a transmission path, the plurality of terminals are defined as a plurality of pairs of transmitting terminals and receiving terminals facing each other,
A plurality of sets of transmitting terminals and receiving terminals are divided into a predetermined number of sets to form blocks, each block is assigned an address, and the addresses are sequentially transmitted from the center unit to each block. , data transmission from a transmitting terminal to a receiving terminal within a block is performed in a predetermined order.

When transmitting data between terminals in this type of multiplex transmission system, there are generally the following problems.

(1) The transmitting terminal transmits the input signal as it is, and the distant receiving terminal only generates a reception output according to the on/off state of the transmitted data.

(2) In remote control, such as on/off control for a distant load, it is inconvenient to simply be able to turn on or off the device remotely;
It is desirable that the parts of the device to be controlled be able to be turned on and off as necessary. This is necessary from the viewpoint of operability and safety.

For this reason, centralized control devices are often configured to transmit data between the center unit and terminals, and to perform on/off control in the same way from the center unit and at the terminals.

However, this type of system has the disadvantage that the center unit configuration is large and expensive, and the center unit configuration must be designed for each need depending on the requirements at that time. There is.

(3) Even if it is possible to control the operation on the terminal itself, there may be discrepancies in the instructions due to differences in the mode and timing of the operation control command from a distance and the operation instruction on the own terminal. For example, if a load is in the OFF state and a reverse operation command is generated to switch it to the ON state at almost the same time in both the center unit and the terminal, there will be a gap between the command from the center unit and the terminal operation. If there is a slight time difference, the order will be reversed from off to on to off, resulting in the opposite result from the originally intended operation.

In order to eliminate these drawbacks, it is possible to give action commands that have meanings that correspond to specific movements, such as "on" or "off" action commands, but the generated information The disadvantage is that the amount increases and the transmission speed becomes slower.

In particular, although instructions on how to send data to a multiplex transmission system may be given meanings as described above, the operation of the terminal itself is not necessarily adapted to the instructions.

(4) As mentioned above, the combination of the center unit and terminals increases the size of the system, and the cost of the center unit increases in order to control operations between each location.

In order to eliminate these drawbacks, it is desirable to use a system that simplifies the information to be transmitted, such as the aforementioned "multiplex transmission system."

However, if the above-mentioned system is used as is, the transmission path is used in a time-division manner to transmit the on-off state, so the operating state of the terminal is simply transmitted to a distant place, and the operating state of the receiving terminal is cannot be reflected on the sending terminal.

For example, even if the information that is transmitted as a signal to operate the terminal is only the on/off status of a contact, the receiving side will receive a signal that is called an automatic return type contact, in which the contact is turned on only when the device is operated. There are various operating principles, such as a method that turns off when you remove your hand, and a method that continues operation by self-holding operation once it is turned on.
A system that only sends simple operations cannot function effectively.

The present invention eliminates the drawbacks of the conventional method as described above, allows the terminal to control its own operation, and transmits the operation results to a distant terminal, so that the terminal can perform the same operations as the transmitting terminal. The object of the present invention is to construct a multiplex transmission system at low cost, which is provided with terminals that can operate independently and correlate their operations with each other.

Another object of the present invention is to provide a system for transmitting operation indications not only between a center unit and terminals, but also between terminals.

That is, the present invention provides a multiplex system in which a plurality of terminals and a center unit are connected via a transmission path, and data is exchanged between the center unit and the plurality of terminals or between the terminals. In a terminal device of a transmission system, the terminal device includes a signal input means for controlling the operation of an output element of its own terminal, a means for transmitting operation state data of the output element to another predetermined terminal device or a center unit, and another device. means for receiving operating state data of an output element transmitted from a terminal device or center unit of the terminal and controlling the operation of the output element of the own terminal; and a signal or operating state data for controlling the operating state of the output element of the own terminal. The present invention is characterized by comprising means for prioritizing one of the faster receptions of the reception and making only the control of the output element based on the prioritized reception valid for at least a certain period of time after the prioritized reception.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing an example of the configuration of a terminal according to the present invention.
1 is a terminal control circuit, which can be composed of a control device centered on a microcomputer. 2 is connected to other terminals via a transmission path. 3 is a local contact switch for generating a contact signal; 4 is an output relay driven by the local contact switch 3; and 5 is an output contact driven by the output relay. The output contact 5 is used to drive a load or light an indicator lamp. 6 is for transmission line and 5V and 12V
It is a power source for

FIG. 2 shows the configuration of FIG. 1 in more detail, and 7 is a filter that connects the transmission line 2 and the microcomputer 8 that constitutes the control device 1. In FIG.
9 is an LED indicator that displays the communication status, including a communication LED that displays the communication content, a check LED,
It consists of LEDs and parity LEDs. 10
is an input signal circuit, and has a contact switch 3 therein.

Next, the operation of one configuration example of the present invention will be explained with reference to the drawings.

The aforementioned multiplex transmission system (Japanese Patent Application Laid-Open No. 59-62246)
As described in , when a pair of terminals is in a state to communicate with each other, if this terminal is to send an on/off signal, first turn on the local contact switch 3 in the input signal circuit 10. do.

Note that the signal from the input signal circuit 10 can be an open/close signal from a switch or an H/L signal from an IC circuit provided within the input signal circuit 10. The signal may be in the form of, for example, a self-returning contact or a latching contact; however, a self-returning contact will be described herein.

When local contact switch 3 turns “ON”,
This on/off information instructs the microcomputer 8 to operate. The microcomputer 8 has its internal
The program stored in the ROM processes the input information, reads the on/off information, and transmits it to a distant terminal through the transmission path 2. At the same time, the output relay 4 is activated and the output contact 5 is turned on. This drives the load of this terminal and turns on the display lamp.

Further, the operation can also be displayed by displaying the output of the microcomputer 8 on the LED display 9.

That is, the operation details of the output relay 4 at this terminal are transmitted to a distant terminal at the same address, and the operation is also displayed on this terminal.

FIG. 3 shows a specific example of the configuration of the terminal device of the present invention, and here, the configuration and operation of the present invention described above are collectively shown.

That is, when the local contact switch 3 is operated and a contact signal enters the control circuit 1, the contact signal is read by the contact signal reading circuit 11, and a reverse operation command is generated from the reverse operation command generation circuit 12 in accordance with the contact signal. This command is supplied to the output relay control circuit 13, and this output relay control circuit 1
3 controls the output relay 4. At the same time, in response to the operation of the output relay 4, the transmission data operation command generation circuit 14 generates a transmission data operation command, and the pulse generation circuit 15 converts this operation command into a pulse signal. to a distant terminal.

A signal from a distant terminal comes in via the transmission line 2 and is read into the transmission data reading circuit 16.
The read transmission data is checked for errors by the error check collation circuit 17, and then the operation command data is obtained from the operation command data generation circuit 18. This data is supplied to the output relay control circuit 13, thereby driving the output relay 4.

When a set of terminals is provided with both a transmitting function and a receiving function, it is necessary to set which terminal in the set of terminals transmits first in the case of the same address.

The following methods are available for this purpose.

(1) Provide a setting switch for sending priority/receiving priority during transmission, and set it to either one in advance. Switching is performed between one set of terminals.

(2) Give two addresses, for example, set the even numbered address as sending priority and the odd numbered address as receiving priority. When multiplexing transmission, use the even numbered address to transmit from terminal A to terminal B, and use the odd numbered address to transmit from terminal B to terminal A. such as transmitting to.

(3) Even when the address is the same, for example, if the data length is 8 bits, when transmitting 4-bit data, the first 4 bits are sent from the terminal on the sending priority side, and the last 4 bits are sent from the receiving priority side. It is also possible.

By using a terminal as described above, for example, at point A, it is possible to display the operation at point B, which is far away, or to control on/off the output of a distant place. Display boards such as call lamps can be easily controlled.

On the other hand, since the operation is controlled not only in the immediate vicinity of the load, but also from a distance, problems arise in this case.

For example, when a certain load is stopped, and an attempt is made to start the load at almost the same time at both the operating end near the load and at the far end, that is, when "starting" is given at a far end from a stopped state, and immediately When a human operates it again, it will stop again. In this way, an action on a machine may work differently than intended, which can be dangerous.

In order to prevent this kind of danger, the present invention:
The following functions are added to the terminal itself.

(1) A decision delay function is added to the manual operation signal side. In other words, when a human performs an operation, a judgment time of about 0.5 to 1.0 seconds is required, so if a control signal is given from a distance within a period of 0.1 to 0.2 seconds before and after the manual operation signal, the control signal given earlier will be Enable only the signal. This feature provides a manual switch contact mode that is valid for each individual input signal or for all input signals, and indicates in the control signal if this contact is "on";
This is achieved by causing the above-mentioned operations to take place.

(2) Even if a load terminal or a remote terminal does not necessarily have a manual operation signal, in a multiplex transmission system, it requires time for transmission to a long distance, so signals may be generated simultaneously from the own terminal and a remote terminal and cause errors. Sometimes there are movements. For this reason, it is preferable to ignore operation commands from a distant place from the time when the output relay 4 is reversed until the time when information is transmitted to a distant place. Therefore, after the output relay 4 is reversed at the own terminal, operation commands from a distance are ignored for a certain period of time (for example, within 1 second).

As described above, the terminal device of the present invention is configured not only to transmit on/off status between two different points, but also to be able to be controlled from its own terminal or from a distant terminal. A function is added to prevent the occurrence of erroneous operations due to delays in human judgment and transmission time delays, and the effect is that remote monitoring and control can be realized easily and inexpensively, and is rich in various modifications and changes. There is. INDUSTRIAL APPLICATION This invention can be utilized for various uses, such as a building management system, a disaster prevention and crime prevention system, and production management of a factory etc., for example.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one configuration example of the terminal device of the present invention, FIG. 2 is a block diagram showing a detailed configuration example thereof, and FIG. 3 is a block diagram showing a specific example of the configuration of the terminal device of the present invention. It is. 1...Terminal control circuit, 2...Transmission line, 3...Local contact switch, 4...Output relay, 5...
Output contact, 6...power supply, 7...filter, 8...
Microcomputer, 9...LED display, 1
0...Input signal circuit, 11...Contact signal reading circuit, 12...Reverse operation command generation circuit, 13...
Output relay control circuit, 14...Transmission data operation command generation circuit, 15...Pulse generation circuit, 16...
Transmission data reading circuit, 17...Error check verification circuit, 18...Operation command data generation circuit.

Claims (1)

[Claims] 1. A multiplex transmission system in which a plurality of terminals and a center unit are connected via a transmission path, and data is exchanged between the center unit and the plurality of terminals or between the terminals. In the terminal device, the terminal device includes a signal input means for controlling the operation of an output element of the own terminal, a means for transmitting operation state data of the output element to another predetermined terminal device or the center unit, and the other terminal device. means for receiving operating state data of an output element transmitted from the terminal device or the center unit and controlling the operation of the output element of the own terminal; and a signal for controlling the operating state of the output element of the own terminal; means for prioritizing one of the earlier receptions of the operating state data and making only the control of the output element based on the prioritized reception valid for at least a certain period of time after the prioritized reception is performed. Terminal equipment for multiplex transmission system.