Manual override using a variable clock frequency in a control sy

Details Manual override using a variable clock frequency in a control sy Manual override using a variable clock frequency in a control sy

1975-03-12

1977-02-22

Sloyan, Thomas J.

Registers

Platform operated

Platform actuated traffic counters

235 92MP, 23515053, 235197, G06M 300

Patent

active

040093727

ABSTRACT:
Variable incrementation of an analog output signal is achieved by using a variable frequency clock generator for providing input signals to be counted by a presettable counter. The counter is preset by a digital word from a control processor which may include a digital computer. An output signal from the counter is applied to a digital-to-analog converter to produce a process control analog signal. The output signal of the variable frequency clock generator is obtained by a sequential selection of a plurality of differing fixed frequency signals from a frequency divider arranged to generate a plurality of lower frequency signals from a fixed frequency clock signal source. A second counter is driven by an output of the frequency divider to further subdivide the clock source signal. The stored count state of the second counter is decoded and the resulting sequential signals are applied to respective gates in combination with corresponding ones of the plurality of fixed frequency signals generated by the frequency divider. The counting operation by the second counter is, thus, effective to sequentially apply the differing frequency signals from the frequency divider through the gates to the presettable counter to increment the stored digital word at the respective frequency of the gated frequency signal.

REFERENCES:
patent: 3342199 (1967-09-01), McEvoy
patent: 3435196 (1969-03-01), Schmid
patent: 3513468 (1970-05-01), Fluegel
patent: 3529138 (1970-09-01), Andre et al.
patent: 3603979 (1971-09-01), Kosakowski
patent: 3632996 (1972-01-01), Paine
patent: 3739374 (1973-06-01), Kiowski
patent: 3754235 (1973-08-01), Dummermuth et al.
patent: 3826991 (1974-07-01), Hogan
patent: 3866024 (1975-02-01), Williams
patent: 3887911 (1975-06-01), Bell
"High Precision Position Control Servo System" D. Zivkovic Nuclear Instruments and Methods, 84, July (1970) pp. 13-20.
B407,357, Jan. 1, 1975, Segal, 235/92 CC.

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