Boots – shoes – and leggings
Patent
1992-06-11
1995-06-06
Lee, Thomas C.
Boots, shoes, and leggings
364151, 364265, 364266, 364DIG1, 371 21, 371 165, G06F 1502
Patent
active
054230055
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention concerns an output management circuit suitable for a programmable control system such as a programmable automatic controller or like device.
2. Description of the prior art
The patent FR-2 607 274 describes a programmable automatic controller input-output management circuit comprising an input-output management unit connected to a processor unit adapted to determine the state of output channels according to the state of input channels with reference to a predefined program and an output circuit which comprises a serial to parallel converter having a serial input connected to a serial output of the management unit and parallel outputs connected via a power stage to respective output channels, the output circuit further comprising control and monitor logic.
In this prior art, the output circuit does not benefit from the simplification and the saving in space achieved by parallel to serial conversion of the input data. Also, it would be highly beneficial to make it possible to sent to the management unit information relating to the state of the output channels, in particular to indicate if any channel is open-circuit or short-circuited, or information relating to the absence of voltage at pre-actuators or at the circuit itself.
An object of the invention is to simplify, in a programmable controller system, the routing to appropriate data output channels and the returning to the management unit of control signals contributing to establishing the reliability of communications and to supervising current and/or voltage faults affecting the output lines.
Another object of the invention is to provide dialogue via two up and down serial links between an output management unit or an input-output management unit and an output circuit using frames preferably having a uniform format.
A further object is to confer upon a local or remote output management circuit great flexibility of use by configuring it very simply so that it can be operated in various different operating modes, in particular an "output" mode and an "input" mode, or so that it can be used equally in digital and analog applications.
A further object is to create an output management circuit which lends itself well to implementation in integrated circuit form.
SUMMARY OF THE INVENTION
According to the invention, in a management circuit of the aforementioned type: serial input a down frame comprising data bits and at least one control bit, comprising a succession of data bits and at least one control bit, and serial link to the output management unit, the logic being adapted to produce from the up frame and/or down frame an up output frame and to route this frame to the serial return output.
The frames returned to the management unit may therefore include bits indicative of the absence of the supply voltage of the pre-actuators or of the module comprising the output circuit or bits indicative of the open-circuit or short-circuited state of one or more output lines.
The up input and output frames preferably have exactly the same format as the down frames.
Configuration means may advantageously be associated with the output circuit, and in particular with its control logic, to achieve selective transmission to the return output of up output frames generated from the down frame or from the up input frame or from both. Likewise, digital-analog application configuration means may be provided to configure selectively output pins of the output circuit either as parallel data output channels or as control connections specific to an analog application.
The output management unit may be connected to the output circuit by respective up and down serial lines and by two clock signal lines, these lines being provided with isolating means such as opto-couplers. The components of the output management circuit are therefore particularly compact and small in number, especially with regard to the isolating means, which means that the reliability of the output management circuit can be increased.
REFERENCES:
patent: 4170791 (1979-10-01), Daughton et al.
patent: 4254473 (1981-03-01), Galdun et al.
patent: 4839852 (1989-06-01), Knutsen
patent: 5065314 (1991-11-01), Maskovyak
patent: 5093804 (1992-03-01), Cieri et al.
patent: 5299314 (1994-03-01), Gates
patent: 5303351 (1994-04-01), Jackowski et al.
PCT Gazette--Section 1, No. Oct. 1992, p. 4690.
PCT Demand, WO92/07312, Apr. 30, 1992.
Gohl Pierre
Gomez Gerard
Pergent Jacky
Wojerz Daniel
Drucker William A.
Lee Thomas C.
Meky Moustafa M.
Telemecanique
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