User manual

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).