JPH0148595B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a computer and its input/output device, and particularly relates to a computer configured to input a large amount of digital data divided into groups and its input/output device. .

[Technical background of the invention and its problems]

Generally, in a computer system that has a large number of input points, constantly capturing and monitoring each input point complicates the system configuration and causes problems.
The load on the computer becomes enormous, making it impractical.

Therefore, conventionally, as shown in Fig. 1, a computer 20
A digital input circuit (hereinafter referred to as DI module) 4-1 to 4-n having a plurality of input points is provided in
A method is used in which this number of input points (24 points in the figure) is taken as one group, divided into n groups, and digital data is input. That is, the input/output device 30
The digital data input to the computer 20 from
Divided into digital data groups 10-1 to 10-n for each input point of DI modules 4-1 to 4-n, and connected to transmission cables 9-1 to 9-n and connector 8.
-1 to 8-n, respectively.

DI modules 4-1 to 4-n each have a CPU
Digital group 10 is read by reading command from 1.
Input circuits 5-1 to 5-n output signals -1 to 10-n to the bus line 21, and state change detection circuits 6-1 to 6-n detect changes in data of digital data groups 10-1 to 10-n. n, interrupt generation circuits 7-1 to 7- that send interrupt signals to the CPU 1 based on the output signals of the state change detection circuits 6-1 to 6-n;
When a change occurs in the data of any digital data group 10-i, the state change detection circuit 6-i detects the change and sends an interrupt signal to the CPU 1 via the interrupt light emitting circuit 7-i. In response to this interrupt signal, the CPU 1 sends a read signal to the corresponding input circuit 5-i, and transfers the data of the digital data group 10-i to the bus line 2.
1, the latest data is taken into the CPU 1, stored in the RAM 2, and various processing operations are performed.

However, recent process control computers have large processing capabilities and the number of input points for digital data is increasing, and the conventional configuration described above has a large number of input points for digital data.
Since a DI module must be provided, the computer configuration becomes complicated, the device becomes larger and more expensive, and there are problems in that noise etc. easily enter, reducing reliability.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems.
A large amount of digital data is divided into multiple data groups and configured to be input in a time-sharing manner, reducing the number of cable cores between the computer and input/output devices, strengthening the computer's noise resistance, and improving reliability. improve,
The purpose is to standardize and downsize input circuits and provide a computer and its input/output device with improved maintainability.

[Summary of the invention]

In order to achieve the above object, the present invention provides a computer that inputs a large amount of digital data and an input/output device thereof, in which the large amount of digital data is divided into a plurality of data groups and inputted, and arbitrary data can be input by a group select signal. a data group selector that selects a group and outputs it as first digital data; and a data group selector that inputs the plurality of data groups, detects changes in the plurality of digital data for each data group, and outputs it as second digital data. A first state change detection circuit is provided in the input/output device, and a first input circuit receives the first digital data as input and outputs the input data to the bus line according to a command from a central processing unit (hereinafter referred to as CPU). and a second device that receives the second digital data and detects changes in the input data.
a state change detection circuit; an interrupt generation circuit that sends an interrupt signal to the CPU based on the detection signal of the second state change detection circuit; and an output circuit that sends the group select signal to the data group selector in response to a command from the CPU. is installed in the computer to reduce the number of cable core wires between the computer and the input/output device, strengthen noise resistance, improve reliability, and improve maintainability by standardizing and downsizing the computer and its input/output device. be.

[Embodiments of the invention]

The computer and its input/output device according to the present invention can be used as a second computer.
This will be explained using an example shown in the figure.

In FIG. 2, a computer 40 includes a central processing unit (CPU) 1, a ROM 3 that stores programs, a RAM 2 that secures a data area necessary for program execution, and a bus line that stores digital data in response to a read command from the CPU 1. 21, an output circuit 12 that outputs a group select signal that selects a data group according to a selection command from the CPU 1, and an input circuit 5- that outputs group data to the bus line 21 according to a read command from the CPU 1. 2. A state change detection circuit 6 that detects a change in group data, and an interrupt generation circuit 7 that sends an interrupt signal to the CPU 1 based on a signal from the state change detection circuit 6.

Further, the input/output device 50 receives digital data groups 10-1 to 10-n whose maximum number of input points per group is determined by the input circuit 5-1, and selects a predetermined digital data group 10-i by a group select signal. It is configured to include a data group selector 13 that selects and outputs data, and a data group state change detection circuit 15 that detects and outputs changes in data for each digital data group 10-1 to 10-n.

The operation of the computer and its input/output device according to the present invention configured as described above will be explained below.

A large amount of digital data inputted from the input/output device 50 to the computer 40 is divided into digital data groups 10-1 to 10-n with the maximum number of input points of one group being the number of input points of the input circuit 5-1, and the data group selector 13 divides the data into digital data groups 10-1 to 10-n. is input to the data group state change detection circuit 15.

Now, any digital data group 10-i
Assuming that a change has occurred only in the data, the data group state change detection circuit 15 detects the change and transmits the information 14 that a change has occurred in the data group 10-i to the transmission cable 9-3 and the connector 8-.
3 to the computer 40. The computer 40 inputs this change information 14 to the input circuit 5-2 and the state change detection circuit 6, and the state change detection circuit 6 sends an interrupt signal to the CPU 1 via the interrupt generation circuit 7. In response to this interrupt signal, the CPU 1 issues a read command to the input circuit 5-2 to output the change information 14 to the bus line 21 and read it. After that, output circuit 1
2. Send a group select signal to the input/output device 50 via the connector 8-2 and transmission cable 9-2, input it to the data group selector 13, and select the data of the digital data group 10-i where a change has occurred. and output it. This digital data group 10-i is transmitted to the computer 40 via the transmission cable 9-1 and connector 8-1, inputted to the input circuit 5-1, and read into the CPU 1 via the bus line 21 in response to a read command from the CPU 1.
Loaded into RAM2. The data of the digital data group 10-i that has changed in this way is read into the computer 40.

In addition, digital data groups 10-1 to 1
When a change occurs in multiple data groups 0-n, the CPU 1 detects the contents from the change information 14 read from the input circuit 5-2 and determines the determined order for all the data groups in which the change has occurred. A group select signal is output at , the digital data of the data group is read, and a series of read operations is completed.

Figure 3 shows the above process started by an interrupt signal.
This is a flowchart showing a series of reading operations.
In the same figure, the block "Compare with previous data" is used to detect which bits of the digital data read into CPU1 have changed.
This shows the operation of comparing with the previous digital data stored in RAM2, and is not directly related to the present invention.

[Other embodiments of the invention]

FIG. 4 is a block diagram showing another embodiment of the computer and its input/output device according to the present invention.

This embodiment has a configuration that can be applied when the number of groups of digital data is less than the number of input points of the input circuit 5, and the input circuit 5-2 in FIG. 2 can be omitted. That is, the output signal 14 of the data group state change detection circuit 15 is input to the digital data input point of a predetermined group (the first group in the figure) of the group selector 13, and the CPU 1 inputs the output signal 14 of the data group state change detection circuit 15 to the digital data input point of a predetermined group (the first group in the figure). (the first group in the figure) is output, and the digital data is sent to the data input points of the other groups (groups 2 to 24 in the figure) except for the predetermined group. Enter numbers 2-10-24 and wait. Therefore, in the standby state, the output signal 14 of the data group state change detection circuit 15 is transmitted to the computer 40 via the group selector 13, the state change detection circuit 6 detects a change in data, and the interrupt generation circuit 7 is activated. An interrupt signal can be sent to the CPU 1 via the CPU 1. When the CPU 1 detects an interrupt signal, it issues a read command to the input circuit 5 to read the change information 14, detects a data group in which a change in digital data has occurred, and thereafter sequentially sends the group select signal for that data group in the same manner as described above. It is possible to output digital data.

Although this embodiment has been described assuming that the number of input points of the input circuit 5 is 24, there is no limit to this number and any number of input points can be implemented.

According to this embodiment, a cable for transmitting the output signal of the data group state change detection circuit 15 is not required, and the system configuration can be realized more easily.

〔Effect of the invention〕

According to the computer and its input/output device of the present invention,
Even when inputting a large amount of digital data, the number of core wires in the cable connecting the computer and the input/output device is reduced, making system configuration easier.
It is possible to strengthen noise resistance, improve reliability, and reduce the load on the computer for data reading. In addition, power consumption can be reduced because a large number of input circuits are not required as in the past, and the system configuration on the computer side can be standardized (modularized, unitized) and miniaturized, resulting in improved economic efficiency due to lower prices. It is possible to obtain effects such as improved maintainability due to ease of maintenance and inspection.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional computer and its input/output device, FIG. 2 is a block diagram of an embodiment of the computer of the present invention and its input/output device, and FIG. 3 explains the operation of the present invention. FIG. 4 is a block diagram of a computer and its input/output device according to another embodiment of the present invention. 1...CPU, 2...RAM, 3...ROM, 4
-i...DI module, 5,5-i...input circuit, 6,6-i...state change detection circuit, 7,7-
i...Interrupt generation circuit, 8-i...Connector, 9
-i...Transmission cable, 10-i...Digital data group, 12...Output circuit, 13...Data group selector, 15...Data group state change detection circuit, 20, 40...Computer, 3
0, 50... Input/output device, 21... Bus line and control line.

Claims (1)

[Scope of Claims] 1. In an input/output system in a computer that inputs a large amount of digital data and that includes an input/output device, the large amount of digital data is divided into a plurality of data groups and inputted, and a group select signal is generated. a data group selector that selects an arbitrary data group and outputs it as first digital data; and a data group selector that inputs the plurality of data groups and detects changes in the plurality of digital data for each data group and outputs the second digital data. A first state change detection circuit that outputs data is provided in the input/output device, and the first digital data is input to a central processing unit (hereinafter referred to as CPU).
a first input circuit that receives the second digital data and outputs the input data to the bus line according to a command from the CPU; a second state change detection circuit that receives the second digital data and detects a change in the input data; and an interrupt generation circuit that sends an interrupt signal to the CPU based on the detection signal of the second state change detection circuit.
An input/output system for a computer, characterized in that the computer is provided with an output circuit that sends the group select signal to the data group selector according to a command from a CPU. 2. In a computer that inputs a large amount of digital data and an input/output system in a computer equipped with an input/output device thereof, the large amount of digital data is divided into a plurality of data groups, inputted, and an arbitrary data group is selected by a group select signal. a data group selector that selects and outputs the data as first digital data; and a first data group selector that inputs the plurality of data groups, detects changes in the plurality of digital data for each data group, and outputs the detected data as second digital data. A state change detection circuit is provided in the input/output device, the second digital data is input to a predetermined data group input point of the data group selector, and the first digital data is input to the central processing unit (CPU). an input circuit that outputs the input data to the bus line in response to a command from the controller; a second state change detection circuit that receives the first digital data and detects a change in the input data; The computer is characterized in that the computer is provided with an interrupt generation circuit that sends an interrupt signal to the CPU in response to a detection signal from the change detection circuit, and an output circuit that sends the group select signal to the data group selector in response to a command from the CPU. Input/output system in computers.