Boots – shoes – and leggings
Patent
1984-06-04
1989-10-03
Chan, Eddie P.
Boots, shoes, and leggings
3649218, 36492693, 3649447, 3649449, 371 221, G06F 1134, G06F 1300
Patent
active
048721360
ABSTRACT:
The invention disclosed is useful in an I/O system of a programmable controller and provides a method and circuitry by which control and diagnostic information is exchanged between a control unit of an I/O module and a plurality of input/output points thereof. A control signal is generated in the control unit in the form of sequential pulse frames such that the control information is defined by a series of pulse width modulated pulses. Each frame includes a no-pulse time period following the review of pulses to mark the end of a frame. Each I/O point receives a control signal of its own and generates a clock pulse in response to each pulse. The clock pulse initiates a sampling of the corresponding pulse and simultaneously initiates return of a diagnostic signal value to the central unit. Thus, the control signal provides for sampling of its own content and provides for a return of a diagnostic data bit for each control bit.
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Data sheets, RIFA Integrated Circuits PBD 3545 and PBD 3544 (2 pages each), RIFA-AB, Stockholm, Sweden.
"Smart ICS for Power Switching", Machine Design, May 10, 1984, pp. 60-65.
Digicable Manual, Direct Digital Industries, Inc., Lexington, Ky.
Cieri Joseph J.
Gareis Ronald E.
Holet Kenneth M.
Kocher Mark J.
Tuso Michael J.
Austin Ormand R.
Chan Eddie P.
Eakman Christina
GE Fanuc Automation North America Inc.
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