JPS59157736A - Interface device - Google Patents

Abstract

PURPOSE:To simplify input/output processing of a main computer by providing a common transmission line between the main computer and plural local computers and setting the use right to every local computer to transmit a signal. CONSTITUTION:The control input of a push-button switch 2A is received by a local computer 9A and is subjected to operation processings such as multiple selection prevention or the like and is encoded and is stored in an RAM13LA. The local computer 9A outputs an interlock signal from an output port 22LA for the purpose of confirming whether a serial transmission line 30b is used by other local computers 9B and 9C or not to transmit this control input to a main computer 1 through the serial transmission line 30b, and the interlock signal from other local computers is inputted from an input port 21LA; and if the use right of the serial transmission line is obtained, the control input is converted to serial data and is outputted from a transmitter 14LA.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to an interface device (
-Related.

E. Technical background of the invention and its problems] FIGS. 1 and 2 show a conventional example of an interface method between a computer and peripheral devices. For example, taking a supervisory control device as an example, in FIG.
．． The output boat 5 has a display output line to the monitoring indicator light 4,
A control output line to a controlled device such as a switch gear or a control center (not shown) is connected. The monitoring indicator light 4 of the control push button switch 2 is generally attached to the operating desk 6C2. In addition to this, the operation desk 6 has two gauges and a numerical display.

A character display 9 image display etc. are installed, and these are connected to the input/output board 3.5 of the computer 1.
Illustrations are omitted here. In addition to this, signals from devices to be controlled (for example, overload failure signals, etc.) are also necessary as inputs to the computer, but are similarly omitted from illustration. The computer 1 performs a predetermined control calculation based on the input from the push button switch 2, and as a result activates the controlled device f2.

Control outputs such as stop are performed, and at the same time, display outputs are output to the corresponding monitoring indicator lights 4. When such a monitoring and control device has a large number of devices to control, the number of push button switches 2 and indicator lights 4 necessary to monitor and control them increases. Therefore, the number of input/output points for the computer 1 increases, and the number of wires between the computer 1 and the operation desk 6 also increases, and if 1b'' is installed separately, the construction cost of C2 will be reduced.

In addition, if there are many groups of control push button switches 2 and monitoring indicator lights 4 as shown in Fig. 2, a local computer 9 is installed for each group, and the main computer 1
The serial input/output port 8 of the computer and the local computer 9 are connected through separate serial transmission paths 10 for transmission. In this way, the number of cables between the main computer 1 and the operation desk 6 will be reduced, but if there are many control groups, the number of serial input/output ports 80 channels on the main computer 1 side will increase, and the number of boards will increase. (The burden of calculation processing for two-person output increases.)

[Objective of the Invention] An object of the present invention is to configure a common transmission path between a main computer and a plurality of local computers, set usage rights for each local computer, and transmit signals (from the second point, the main computer simplifies input/output processing,
An object of the present invention is to obtain an input/output interface device that requires less wiring with peripheral devices such as an operating desk.

[Summary of the Invention] The present invention relates to an interface device for transmitting and receiving signals between a main computer and a plurality of local computers, and is shown in FIG.

A common transmission path 30 consisting of at least C2 between the main computer and each local computer.

Means a for storing a control input signal provided for each local computer f2, and a means C2 for storing a control input signal when the control input signal is applied; means C for outputting an interlock signal to the other local computer; Condition (1) that the computer has not obtained the right to use the transmission path (2) Means for transmitting the stored control input signal to the main computer via the transmission path (d)
It is equipped with the following.

[Embodiments of the Invention] The present invention will be described in detail below with reference to an embodiment shown in drawings. In FIG. 3, reference numeral 1 denotes a main computer, which has a central processing element 11M (hereinafter referred to as CPU) that executes various glaze calculation processes to be described later in accordance with a pre-charging program l2. Reference numeral 12 denotes a read-only memory (hereinafter referred to as ROM), which stores various fixed data used for the program and arithmetic processing. 13M is a random access memory (hereinafter referred to as RAM), which is used for temporary storage of calculation results, etc.
: Use.

19M is an output capacitor (Dδ) which outputs a control signal to a device (for example, a pump) 23M. 14M is a transmitter/receiver (USART) for serial transmission. These are connected to each other via an address, f-TAOJ, 0: control bus (hereinafter referred to as bus) 20M. The transceiver 14M includes a plurality of local computers 9A and 9B.

. . . It has an output transistor 16M for outputting a serial signal (for example, a 20 mA current signal), and a 7-power transistor 15M for inputting serial signals from the local computers 9A, 9B, . . . .

The local computer 9A, like the main computer 1, has a CPU IILA and a ROM IILA.
, RAM 13LA, transmitter/receiver 14 I, A, and an output capo that outputs signals to C1 and other monitoring indicator lights 4A)
19LA and an input boat (D engineering) that inputs signals from two pushbutton switches (+r, an output port that outputs interlock signals to A and other local computers) 22
LA has an input port 21LA for inputting interlock signals from other local computers, and these are connected to each other via a bus 18LA. Further, the C two-speed receiver 14LA includes a photocube, 7151LA, for inputting serial signals from the main computer.
Output transistor 16 outputting to main computer l
Has LA. This configuration also applies to other local computers 9
The same goes for B,...

The lkl of such local computers 9A, 9B, . . . and the main computer 1 are connected by a common serial transmission path 2012 as shown. Serial transmission line 30 A serial transmission line 3 that outputs from the main computer 1 to the local computers 9A, 9B, . . .
0Q, local computers 79A, 9B, ... Serial transmission line 30b that outputs to the main computer
each local computer 9A, 9
B, . . . are connected in parallel.

The above configuration (2) and its operation will be explained with reference to chart 70 in FIG.
After performing arithmetic processing such as preventing multiple selection, the signal is encoded. That is, the input port of the local computer 9A)2
The signals from the two pushbutton switches enter 0LA as control inputs, and are read by CPU IILA through bus 18LA.
Programs that are pre-registered using M 12LA or RAM 13LA (ROM 12LA-2 registration)
The input signal is determined according to the following.

Check for errors such as multiple selection of one unit at the same time, convert to the appropriate code (for example, ASCII code, etc.), and send the RA.
Store in the M13LA table.

Since the local computer 9A transmits this control input to the main computer 1 via the serial transmission line 30b, it is necessary to confirm that the serial transmission line 30b is not being used by the other local computers 9B, 9G, etc. In other words, the local computer 9A communicates with another local computer 9B in order to obtain the right to use the serial transmission path 20.

9C1...Hain interlock output boat 22L
Output from A (step a, 1)). Then, after counting (step C) using a timer (for example, several milliseconds) to prevent malfunctions due to timing, other local computers 9
B, 90. . . . is input from input capo 21LA (step d). Other local computers 9B, 90. ...is serial transmission path 3
If the right to use 0 is obtained, the interlock signal should be reset (step f), and after a certain time count (step?), the % challenge will be made again (step b). If the other local computers 9B, 9(!,...) are not using the serial transmission path 30, the local computer 9A obtains the right to use the serial transmission path 3G and starts serial transmission (step I). .Serial transmission is done using the RA mentioned above.
M Converts the controller signal stored in the table of 13LA into U column data, repeats ON-0FF of output transistor L6Lh by transmitter/receiver 14LA, and outputs it to main computer 1.0 In main computer l, this control input A signal is input from the photocub +tSU+2, and when the transmitter/receiver 14M receives the Q signal, the CPU IIM stores this signal in the RAM 13M according to the programs of Fl and OM 12M, and outputs the control signal a to the device 23M. Sending and receiving a confirmation signal (outputted by the M device 14M via the output transistor 16M.The confirmation signal is a signal obtained by inputting a state change signal from the device 23M, which is converted into a predetermined code, and corresponds to the control output described above. This confirmation signal may be sent via the serial transmission path 30.2 to the photocoupler 15 LA of the local computer 9A.
PU IILA I-Manually powered 0 As a result, the local computer 9A can confirm that the output signal was processed by the main computer 1. That is, when a confirmation signal is received 4g, the monitoring indicator light 4 corresponding to the content is activated.
In order to output the Al2 display, step L) and turn it on.

From this step 52, the interlock signal of the local computer 9A is reset to complete the entire process (step 7).

In addition, in the above embodiment, the local computer 9A,
As a confirmation signal display process on the 9B, ... side, 4A, such as a monitoring display, is lit up, but the confirmation signal can also be displayed using a CRT, plasma display, audio output device, etc. You may do so. For example, if the object to be controlled is a pump, local computers 9A, 9B,
... side memory l2, "A1 pump start" r A2
When a confirmation signal is received, the corresponding data such as the code content of the confirmation signal is read out, and this data is transferred to the above-mentioned CRT.
The output deviation can be confirmed by text or voice on a display, plasma display, voice output device, etc.

[Effects of the Invention] As described above, according to the specified invention of C2%, +i Requirement V Range, Item 1, signal transmission between multiple devices including a main computer and multiple local computers that are scattered in each group is possible. This can be achieved using a common transmission path, resulting in a significant reduction in the number of connecting cables.

Distribution costs become cheaper. Especially (- This becomes noticeable when the distance between the main computer and the local computer is long and the distance between the local computers is short. Also, on the main computer side, a large number of devices can be connected with a 1-channel input/output port, and the input/output Furthermore, according to the invention described in Section 2, the hardware configuration and software processing are simplified.
In addition to transmitting the control input signal to the main computer, the return confirmation signal and its display processing can be performed using the aforementioned common transmission path.

[Brief explanation of drawings]

1 and 2 are block diagrams showing the conventional device, FIG. 3 is a diagram clearly showing the present invention, FIG. 4 is a block diagram showing an embodiment of the interface device according to the present invention, and FIG. 5 is a block diagram showing the local interface device. It is a flowchart showing the operation of the computer. 1... Main computer 2... Push button switch 3
...Input port 4...Monitoring indicator light 5...
Output port 6...Operation desk 8...Serial input/output board 9...Local computer 30...Common transmission line 11M, IILA, IILB...Central processing element 1
2M, 12LA, 12'LB... Read only memory 13M, 13LA, 13LB... Random access memory 14M, 14I, A, 14LB...
Serial transmission transceiver 15M, 15LA, 15L
B...Photocabra 16M, 16LA, 16LB
...Output transistor 18M, 18MA, 18M
B...Bus 19M, 19'I, A, 19LB...
・Output boat 20LA, 20LB...Input boat 2
1LA, '21LB...Input boat for interlock 22LA, 22LB...Output boat for interlock 23M...Equipment agent Patent attorney Noriyuki Kon (and 1 other person) Figure 4 Figure 5

Claims (2)

[Claims] (1) In an interface device for transmitting and receiving signals between a main computer and a plurality of local computers, a common transmission path 30 configured as C2 is provided between the main computer and each local computer, and a common transmission path 30 is provided for each of the local computers. means (a) for storing a control input signal when it is provided; and means (a) for outputting an interlock signal to another local computer 1 in order to obtain the right to use one of the transmission lines when the control input signal is provided; (b) means C for inputting an ink clock signal from another local computer and determining whether or not another local computer has the right to use the transmission path; 2. Means d for transmitting the stored control input No. 48 to the main computer via the transmission path. (2) In an interface device for transmitting and receiving signals between a main computer and a plurality of local computers, a common transmission path 30 is provided between the main computer and each local computer, and each of the local computers If the control input signal is given fi
If the control input signal is given, there is a means α for storing it, and a means α for outputting an ink clock signal to another local computer in order to obtain the right to use the transmission path based on the fact that this control input signal is given. means C for inputting an ink clock signal of the computer and determining whether or not another local computer has obtained the right to use the transmission path; means d for transmitting the stored control input signal to the main computer through the transmission path; and means θ for receiving a confirmation signal transmitted from the main computer through the transmission path and performing display processing according to the content of the signal; The main computer receives a control input signal transmitted from the local computer through transmission line f2, and has means J for performing a corresponding control output, and means J for transmitting the result of this control output as a confirmation signal to the local computer from transmission line f2. An interface device 0 comprising: