Coded data generation or conversion – Digital code to digital code converters – Tree structure
Patent
1995-10-04
1997-12-09
Lee, Thomas C.
Coded data generation or conversion
Digital code to digital code converters
Tree structure
395824, 341144, 341139, G06F 1312
Patent
active
056969880
ABSTRACT:
A current/voltage configurable I/O module is provided for a programmable logic controller. The I/O module includes first and second D/A converters which are cascaded together such that a data stream provided to the first D/A converter flows through to the second D/A converter. Each of the D/A converters includes a respective current output, a voltage output and range/mode select inputs. A serial to parallel shift register is coupled between a microprocessor data output and the data input of the first D/A converter such that information from a data stream supplied by the microprocessor is passed in serial fashion to the first and second D/A converters. The shift register also includes parallel outputs, namely range/mode select outputs, to which range/mode select information from the data stream is provided. The range/mode select outputs of the shift register are coupled to the range/mode select inputs of the first and second D/A converters such that the range/mode select information can instruct the first and second D/A converters with respect to a current/voltage mode and a current/voltage range to employ. In this manner, the range and mode of the I/O module can be readily configured and reconfigured as desired.
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Dale Cory L.
Gantman Russell S.
Hackenbruch Kevin M.
Beusse James H.
GE Fanuc Automation North America Inc.
Lee Thomas C.
Ton David
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