JPH0241958B2 - - Google Patents

Description

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

Various systems have been proposed for multiplex transmission systems, but operation control for distant terminals using multiplex transmission systems is basically based on transmitting on/off information; The purpose is to control the on/off of the output relay of the remote terminal regardless of the situation.

Therefore, various problems arise when attempting to actually operate the system. For example, when transporting an article from point A to point B, the drive must be stopped when point B is reached. Therefore, it is necessary to provide a function to turn off the drive by operating a limit switch in order to stop the motor at point B. however,
Even if a limit switch is inserted in series in the circuit of the drive section and operated, it is difficult to know what state the drive section is in at that time at the remote terminal.
This is not known by the transmitting terminal that sends the operation control signal.

As mentioned above, there are generally two types of motion control: "driving motion" and "motion restraint," but conventionally, the "motion restraint" function has not been provided.

The present inventor has proposed that 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 formed into a plurality of sets of transmitting terminals and receiving terminals facing each other, and a plurality of sets of The transmitting terminals and receiving terminals are divided into blocks by a predetermined number of sets, addresses are assigned to each block, and the addresses are sequentially transmitted from the center unit, so that each block is sequentially transmitted. The block is configured to transmit data from a transmitting terminal to a receiving terminal in a predetermined order, and controls the operation of the terminal itself, and transmits the operation result to a distant terminal. The terminal performs the same actions as the sending terminal.
He proposed a ``multiplex transmission system'' (Japanese Patent Laid-Open No. 59-62246).

However, the present invention eliminates the above-mentioned drawbacks of the multiplex transmission system and increases the safety of the multiplex transmission system by generating an "operation inhibiting" signal, that is, an interlock signal at the terminal. The purpose is to increase the number of types of information and increase the number of types of information.

The operation stop signal here means an operation end signal depending on the application, and in other applications, it means an operation prohibition state,
It may mean a dangerous situation.

The present invention is suitable for use as a terminal device in the above-mentioned "multiplex transmission system" by the present inventor, and is particularly suitable for use as a terminal device in the "multiplex transmission system" by the present inventors, and in particular, it is possible to use the internal output relay of the terminal device based on operation information from a distant terminal. It has an interlock function that can prevent it from operating.

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 has a signal input means (11, 12, etc.) that controls the operation of an output element (4, etc.) of its own terminal, and signals transmitted from other predetermined terminal devices or a center unit. Control means (16, 17, 18) that receives the operation command data of the output element and controls the operation of the output element of its own terminal.
etc.), an interlock signal input means (19 etc.) that prevents the operation of the output element by the signal input means and the control means, and transmission from the operating state data of the output element and the signal of the interlock signal input means. Means for creating and transmitting data to other predetermined terminal equipment or center unit (1
4, 21, 15).

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

FIG. 1 shows an example of the configuration of a terminal according to the present invention, where 1 is a terminal control circuit, which can be composed of a control device mainly including a microcomputer.
Reference numeral 2 denotes a transmission path, which is connected to other terminals. 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 local switch 4 includes an interlock switch for generating a function in the terminal control circuit 1 to block operation information from a distant terminal.
Contains ILS. The output contact 5 is used to drive a load or light an indicator lamp. 6 is a power supply for the transmission line and for 5V and 12V.

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.
Reference numeral 9 denotes an LED indicator for displaying the communication status, which is composed of a communication LED for displaying the content of communication, a check LED, a parity LED, and an interlock LED. 10 is an input signal circuit which includes a contact switch 3 including an interlock switch ILS.

The configuration example of the present invention operates as follows.

The aforementioned multiplex transmission system (Japanese Patent Application Laid-Open No. 59-62246)
A pair of terminals A and B as described in
FIG. 3 shows a state in which communication is carried out between the two. If an on/off signal is to be sent from this terminal, first the local contact switch 3 in the input signal circuit 10 is turned on. 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, but will be described here as a self-returning contact.

When local contact switch 3 turns “on”,
This on/off information instructs the microcomputer 8 to operate. The microcomputer 8 processes input information using a program stored in its internal ROM, reads on/off information, and transmits it to a distant terminal via the transmission line 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 lights up the indicator lamp.

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

That is, the operation details of the output relay 4 in this terminal are also transmitted to a distant terminal with the same address,
Moreover, the operation is displayed on this terminal as well.

When the interunit switch ILS is turned on, the control device 1 enters the interlock mode.
At that time, even if the output contact 5 is in the closed state, the operation of changing the state of the output relay 4 to another state is prevented.

The open/closed status of the contacts is also transmitted to the remote terminal that transmits the operation information, and the LED display 9
At this time, even if the remote terminal sends operation information and attempts to change the operating state of the output relay 4 from closed to open, for example,
That action is blocked. Information indicating that the device is in interlock mode is also sent to the remote terminal, and the interlock LED on the display 9 of the remote terminal is displayed.
will flash to indicate that it is in interlock mode.

FIG. 4 is an explanatory diagram of the functions of the terminal device of the present invention,
The structure 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, it is read by the contact signal reading circuit 11, and a reverse operation command generation circuit 12 generates a reverse operation command in accordance with the contact signal. This command is sent to the output relay and
This output relay is supplied to the LED control circuit 13.
The output relay 4 and interlock LED 9 are controlled by the LED control circuit 13. At the same time, in response to the operation of the output relay 4, the operation command transmission data generation circuit 14 generates operation command transmission data, and the pulse generation circuit 15 converts this operation command into a pulse signal as part of the transmission data. , and sends it to a distant terminal via transmission path 2.

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 the interlock switch ILS is turned on, the information is read into the interlock contact reading circuit 19 in the control device 1, which activates the interlock command generation circuit 20, causing the circuit 12 to perform inversion operation from its own terminal. It also blocks commands and operation commands from other terminals through the circuit 18, and does not operate the output relay LED control circuit 13. At the same time, this state information is converted into a pulse signal by the pulse generation circuit 15 via the interlock signal data generation circuit 21, and is transmitted to another terminal as part of the transmission data.

In principle, the means shown in Figures 1 and 2 are provided in all terminals, but the interlock switch ILS can also be provided in only one of a pair of terminals facing each other. . In addition, other functions, for example, input signal circuit 1
0, output relay 4, interlock LED, etc., may also be provided in only one terminal.

Now, as shown in FIG. 3, there is a pair of terminals A and B, and here, for example, only one terminal B is provided with an interlock switch ILS,
Assuming that the load is driven by the output relay of terminal B, if the interlock switch ILS is open, the output relay 4 of terminal B will be driven by the operation information from terminal A. It can also be operated depending on the input signal. When the input signal turns "on" at terminal A, the output relay 4 of the terminal turns "on" and the operation display LED lights up. This operating state is also transmitted to terminal B in accordance with the transmission procedure of the multiplex transmission system disclosed in Japanese Patent Laid-Open No. 59-62246, and the output relay of terminal B is operated. Terminal B is also provided with an operation display LED 9 in parallel with the output relay 4, so the operation status can be visually checked there as well.

The output relay is turned on, the load is driven, and after a certain period of time, when it reaches the stop position, it no longer needs to be driven, so terminal B takes on the drive stop function in contact switch 3. Turn on the limit switch to stop driving the load, and turn off the output relay that has been displaying the operation so far.

Here, at the same time, the interlock switch ILS
also turns “on” (closed circuit state) and interlocks.
You can make the LED blink.

This operating state is transmitted to terminal A according to the communication procedure described above, and the interlock LED of terminal A also blinks. As mentioned above, this lighting display indicates that the interlock switch ILS is turned on.
This indicates that the operation of the output relay 4 is blocked, but when the input signal from terminal A or terminal B comes in again under this condition, the light indicating the operation mode of the output relay goes out and it simply turns off. The interlock switch will turn on continuously to indicate that it is in the "on" state. i.e. interlock LED
The lighting modes are as follows.

Continuous lighting: Indicates that the interlock switch is closed.

Flashing on: Indicates that the interlock switch is preventing the output relay from operating.

By providing an interlock switch ILS in both terminal A and terminal B, the operation of output relay 4 can be prevented even if either is turned on. This function can be used for locking to ensure safety.

Next, FIG. 5 shows an example of the format of transmission data for incorporating the terminal device of the present invention into the aforementioned multiplex transmission system. In this case, the total operating information is 8.
The bit and parity bit are 1 bit.

Each terminal is equipped with four output relays, and each signal display is for four output relays. The 4 bits numbered from 0 to 3 are "operation signals" based on input signals, and are signals indicating the operating state of the output relay of the own terminal. The four bits numbered 4 to 7 are "interlock signals" that indicate the open/close states of four interlock switches corresponding to four output relays. The output contact 5 may be a self-resetting contact, a mechanical contact, or a latch type contact, but it is assumed that the function is specified for each terminal in advance.

With this transmission data, even if the "operation signal" for driving a specific output relay is now "on" (the corresponding pulse becomes "H" level), the "interlock signal" corresponding to that output relay is activated. ” is “ON” (corresponding pulse is “H” level), the output relay cannot operate and the interlock LED flashes. If the pulse of the "operation signal" is "H" level and the pulse of the "interlock signal" is "L" level, the output relay operates and its operating state is
Displayed on LED.

The transmission data shown in Fig. 5 is transmitted between a pair of terminals from one terminal to the other terminal, and almost the same transmission data is also sent from the other terminal. It's becoming like that.

As a result, the "interlock signal" is determined with priority given to whichever terminal in a set of terminals receives "H" data.

If the “interlock signal” is “L”,
The "operating signal" changes to a new operating state by preferentially using a signal that has changed from the state before communication. When operation is blocked by the "interlock signal", the interlock LED will blink, so turning the "operation signal" back on will return the output relay from operating mode to non-operating mode. be able to.

When the data transmission interval between terminal A and terminal B becomes wider, even if the operating signal changes at one terminal,
The results are slow to be reflected on other terminals, making it difficult to make decisions.

It is preferable to change the operating signal and reflect it almost simultaneously. In other words, once data is exchanged through communication within the same block using the aforementioned "multiplex transmission system," data is retained in the microcomputer within the control device due to signal changes during this block communication period. For example, the data in the third block cannot be reflected in this block.
As shown in the figure, a set of addresses consisting of odd numbers and corner numbers is assigned to terminal A and terminal B, and when the address is an even number, data is transmitted from terminal A to terminal B, and when the address is the next odd number, the terminal Data is transmitted from terminal B to terminal A. After communication within that block, the data from both terminals A and B are used to display the output relay operation using the LED.
Judgment is based on the display.

In the configuration example of the present invention described above, each terminal has four output relays, but the number can be arbitrarily selected as necessary.

In addition, in the example shown in Fig. 5, the information of one unit is composed of 8 bits, but for example, one unit is made up of 16 bits, and the first 8 bits are used for data transmission from terminal A, and the latter 8 bits are used for transmitting data from terminal A. Bits may be allocated to the transmission of data from terminal B so that there is no need to use two addresses.

These formats may be determined and configured in advance when planning the entire system.

Furthermore, in FIG. 5, the output "operation signal" and "interlock signal" are shown as one set.
The present invention is not necessarily limited to such combinations, and may be modified to use "information" meaning both "operation" and "interlock" of the output relay. For example, it is easy to imagine a modification in which an input signal is sent as operation information, and a signal is sent as "interlock information" only when interlock is actually being performed.

As explained above, the present invention provides terminals of a multiplex transmission system with an interlock function to prevent operation, so that it is possible to block operation signals from the own terminal or other terminals, and to prevent the operation. Since the status can be transmitted to and displayed on a remote terminal, the remote monitoring function can be improved and the safety of the entire system can be increased.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one configuration example of a terminal device according to the present invention, FIG. 2 is a block diagram showing a detailed configuration example thereof, and FIG. FIG. 4 is an explanatory diagram showing a specific example of the terminal device of the present invention, and FIG. 5 is an illustration of an arrangement of information transmitted by the present invention. It is a figure which shows an example. 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... Operation command transmission data generation circuit, 15... Pulse generation circuit, 16...
Transmission data reading circuit, 17...Error check verification circuit, 18...Operation command data generation circuit,
19...Interlock contact reading circuit, 20
...Interlock command generation circuit, 21...Interlock signal data generation circuit, ILS...Interlock switch.

Claims (1)

[Claims] 1 A plurality of terminals and a center unit are connected via a transmission line, and data is exchanged between the center unit and the plurality of terminals or between each other. In a terminal device of a multiplex transmission system, the terminal device has a signal input means for controlling the operation of the output element of its own terminal, and receives operation command data of the output element transmitted from another predetermined terminal device or a center unit. a control means for controlling the operation of the output element of the own terminal; an interlock signal input means for preventing the operation of the output element by the signal input means and the control means; and operation state data of the output element and the interlock signal. 1. A terminal device for a multiplex transmission system, comprising means for creating transmission data from a signal of an input means and transmitting the data to another predetermined terminal device or a center unit. 2. In the terminal device of the multiplex transmission system according to claim 1, the interlock signal can control a state in which the operation signal is blocked and an interlock state formed by the interlock signal, respectively. A terminal device for a multiplex transmission system, characterized in that it is provided with display means for displaying each separately.