Computer Expressions 40CG Uživatelský manuál stáhnout pdf (Strana 135)

Computer Gateway User Manual 4-99 5/96

4.8.2

Form 2

Word 1 =2 (integer)—digital process data value

Word 2 ordinal value of a self-defined enumeration

(integer)

Word 3 not used (real, initialized to IEEE NaN)

Words 4..5 timestamp (unsigned 32-bit integer)

Form 3

Word 1 =5 (integer)—time change

=6 (integer)—outage

=7 (integer)—no data

=11 (integer)—collection inhibited

=12 (integer)—not in history

=14 (integer)—fast collection not configured

Words 2..3 not used (real, initialized to IEEE NaN)

Words 4..5 timestamp (unsigned 32-bit integer)

For Averages (history type = 1,2,3,4, or 5), each subrecord is 10

words long, and conforms to one of two forms. Content of each

subrecord is established by its value type (word 1 of the

subrecord). See paragraph 4.8.2.2.

Form 1

Word 1 =0 (integer)—normal data, or

=1 (integer)—nonstandard, or

=5 (integer)—time change, or

=13 (integer)—time change nonstandard

Words 2..3 process value (real)

Words 4..5 timestamp (unsigned 32-bit integer)

Words 6..7 maximum process value* in period (real)

Words 8..9 minimum process value* in period (real)

Word 10 number of samples (unsigned 16-bit integer)

Form 2

Word 1 =6 (integer)—outage, or

=7 (integer)—no data, or

=12 (integer) not in history

Words 2..3 not used (real, initialized to IEEE NaN)

Words 4..5 timestamp (unsigned 32-bit integer)

Words 6..7 not used (real, initialized to IEEE NaN)

Words 8..9 not used (real, initialized to IEEE NaN)

Word 10 not used

_________________________

*Because of the storage method used, Minimum/Maximum process values can have up to 1% error (+1% for maximums

and -1% for minimums).

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Computer Expressions 40CG Uživatelský manuál Strana 135