High speed input/output module and programmable logic control de

Details High speed input/output module and programmable logic control de High speed input/output module and programmable logic control de

1989-03-17

1990-09-04

Zache, Raulfe B.

Boots, shoes, and leggings

3649269, 36492693, 364949, G06F 300

Patent

active

049549804

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a programmable logic control (PLC) device, and more specifically, to a PLC device provided with a high speed input/output module capable of processing an input/output signal at high speed.
A PLC device processes a sequence program by receiving an input signal and outputting an output signal as a result thereof, and repeatedly executes this cycle. A scanning time (process time) of the sequence program is usually about several milliseconds to one hundred milliseconds. Most controls are executed during that time, but some controls must be partially processed at a very high speed, e.g., in a very short time such as one millisecond or less.
Conventionally, a special unit is provided for the high speed processing, wherein a signal is transmitted between the special unit and a PLC device for effecting an overall control.
This special control unit, however, is cumbersome as a system and requires a large space for the installation. Further, an interface between the PLC device and the special unit is complex.


DISCLOSURE OF THE INVENTION

An object of the present invention is to solve the above problems and to provide a PLC device provided with a high speed input/output module capable of processing an input/output signal at a high speed without using a special high speed processing unit.
To solve the above problems, in accordance with a first embodiment of the present invention, there is provided a high speed input/output module used for a PLC device, a numerical control apparatus and the like, comprising a programmable logical operation element which executes a logical operation at high speed in response to an external input signal and an output from a PLC control unit, externally outputting a result of the logical operation, and inputting the result to the PLC control unit.
Further, in accordance with a second embodiment of the present invention, there is provided a PLC device executing a logical operation process of a sequence program by a microprocessor, comprising a programmable logical operation element which includes a high speed input/output module able to execute a logical operation at a high speed in response to an external input signal and an output from a PLC control unit, externally output a result of the logical operation, and input the result to the PLC control unit.
The logical operation element can independently execute a simple operation process, and processes an input/output which must be processed at a high speed, and externally outputs same. When necessary, the element later transmits it to a PLC control unit.
This high speed module is coupled with the PLC device, a numerical control apparatus or the like, and processes an external signal which must be processed at a high speed.
In addition, an arrangement of the PLC device including this high speed module processes the external signal which must be processed at a high speed, without the need for a special processing unit.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of an overall PLC device of an embodiment of the present invention; and
FIG. 2 is a detailed diagram of a high speed input/output module.


DESCRIPTION OF THE PREFERRED EMBODIMENT

An embodiment of the present invention will be hereinafter described in detail with reference to the drawings.
FIG. 1 is a block diagram of an overall PLC device of an embodiment according to the present invention, wherein 10 designates a PLC control unit as a center for controlling the PLC device 20 designates a high speed input/output module for processing an input/output signal to be processed at high speed, which will be described later in detail, 41 designates an input module for receiving an input signal from a switch or the like and applies the input signal to the PLC control unit through an I/O bus, and 42 designates an output module for receiving an output signal from the PLC control unit 10 through the I/O bus 40, and outputs same to energize a lamp, a solenoid and the like.
Next, the interior of the PLC control uni

REFERENCES:
patent: 4227247 (1980-10-01), Kinter
patent: 4455621 (1984-06-01), Pelley et al.
patent: 4700326 (1987-10-01), Florine
patent: 4750113 (1988-06-01), Bugert
patent: 4751672 (1988-06-01), Yamada
patent: 4751673 (1988-06-01), Agarwal et al.
patent: 4847612 (1989-07-01), Kaplinsky

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