ABB COM600 series Data Historian Operator's Manual page 67

1MRS756739 COM600 series, Version 5.0
Data Historian Operator's Manual
Time identifier Description
MON, MONTH, Months, local time
MONTHS
MON_UTC, Months, UTC time
MONTH_UTC,
MONTHS_UTC
Y, YEAR, YEARS Years, local time
Y_UTC, Years, UTC time
YEAR_UTC,
YEARS_UTC
PL, PLEN, PERI- Source data period lengths. E.g. if the source data is AVG5MIN, AVG2PLEN
ODLENGTH produces data that has been averaged over 10 minutes (AVG5MIN |
AVG2PLEN equals AVG10MIN).
Supported constants and functions in the CALC Filter
Supported constants:
•
y = the current y value
•
x = the current x value
•
PI = pi
• e = natural logarithmic base
• prevy = previous y value, for the first value in result set this is the same as y
• prevyz = previous y value, for the first value in result set this is zero
• prevx = previous x value, for the first value in result set this is the same as x
• prevcy = previous calculated y value (result of the calculation of previous values)
• periodlength = period length in 100 nanosecond units
•
goodtime = time the value has not been invalid (representativeness affects too)
•
meantime = x-prevx
Supported functions:
•
abs(x) = absolute value of x
•
acos(x) = arcus cosine of x
• asin(x) = arcus sine of x
• atan(x) = arcus tangent of x
• ceiling(x) = x rounded to next greater integer value
• cos(x) = cosine of x
• cosh(x) = hyberbolic cosine of x
• exp(x) = returns e raised to specified power
•
floor(x) = x rounded to next smaller integer value
•
log(x, y) = returns base y logarithm of the specified number
•
log10(x) = returns base 10 logarithm of the specified number
•
max(x, y) = if x > y, returns x, else y
• min(x, y) = if x < y, returns x, else y
• pow(x,y) = returns x raised to power of y
• rand(x) = returns a random number from 0 to x
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