The following functions are available to expressions created for performance calculation tags and calculation triggers in Hyper Historian. Expressions for calculating a calculated tag are defined for the calculated tag itself, as described in the Configuring a Calculated Tag topic.
The functions listed in this topic are supplemental to all Expression Editor functions described in the Expression Editor topic. Click on one of the following hyperlinks to go directly to descriptions of the functions.
Date and Time functions - Click here to see Date and Time functions in the Expression Editor's Functions menu
Data value functions - Click here to see Data Value functions in the Expression Editor's Functions menu
Historical functions (including standard deviation and variance functions) - Click here to see Historical functions in the Expression Editor's Functions menu
Metadata functions - Click here to see Metadata functions in the Expression Editor's Functions menu
The date and time functions that you can use in expressions for calculated tags are listed here and are described in more detail below.
now - Trigger time (Local time) of the trigger that invoked this calculation
utcnow - Trigger time (UTC time) of the trigger that invoked this calculation
yday - Returns a timestamp based on current trigger time with time portion rounded to 12:00:00 AM and date moved to preceding day
today - Returns a timestamp based on current trigger time with time portion rounded to 12:00:00 AM
mintime - Returns the smallest possible value of DateTime type
maxtime - Returns the largest possible value of DateTime type
tolocal - Converts to Local time
toutc - Converts to UTC time
isdst - Returns true when given timestamp is within the Daylight Savings Time range for the current time zone; returns false when given timestamp is in UTC
noon - Returns a timestamp with the date portion taken from the given time and the time portion rounded to 12:00:00 PM
bday - Returns a timestamp with the date portion taken from the given time and the time portion rounded to 12:00:00 AM
bmonth - Returns a timestamp with the month and year taken from the given time and the time portion rounded to 12:00:00 AM
byear - Returns a timestamp with year taken from given time and time portion rounded to 12:00:00 AM
second - Seconds part of a given timestamp (0-59)
minute - Minutes part of a given timestamp (0-59)
hour - Hour part of a given timestamp (0-23)
day - Day part of a given timestamp (1-31)
month - Month part of a given timestamp (1-12)
year - Year part of a given timestamp (4-digit year)
yearday - Returns an Integer between 1 and 366 representing the day of the year for a given timestamp
weekday - Returns an Integer between 0 and 6 representing the day of the week for a given timestamp (0=Sunday, 6=Saturday)
dayseconds - Returns an Integer between 0 and 86399 representing the seconds of the day for a given timestamp
Returns the local time of the trigger that invoked this calculation.
Format: now()
Returns: DateTime Value
Returns the UTC time of the trigger that invoked this calculation.
Format: utcnow()
Returns: DateTime Value
Returns the time based on the current trigger time with the time rounded to 12:00:00 AM and the date moved to the preceding day.
Format: yday()
Returns: DateTime Value
Returns the time based on the current trigger time with the time rounded to 12:00:00 AM.
Format: today()
Returns: DateTime Value
Returns the smallest possible value of the DateTime type.
Format: mintime()
Returns: DateTime Value
Returns the largest possible value of the DateTime type.
Format: maxtime()
Returns: DateTime Value
Returns the local time for the given UTC time. When the given time is local, it does nothing.
Format: tolocal(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: DateTime Value
Returns the UTC time for the given local time. When the given time is UTC, it does nothing.
Format: toutc(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: DateTime Value
Returns true when the given timestamp is within the Daylight Saving Time range for the current time zone; returns false when the given timestamp is in UTC.
Format: isdst(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: Boolean (true/false) Value
Returns the time with the date portion taken from the given time and the time portion rounded to 12:00:00 PM.
Format: noon(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: DateTime Value
Returns the time with the date portion taken from the given time and the time portion rounded to 12:00:00 AM.
Format: bday(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: DateTime Value
Returns the time with the month and year taken from the given time and the time portion rounded to 12:00:00 AM.
Format: bmonth(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: DateTime Value
Returns the time with the year taken from the given time and the time portion rounded to 12:00:00 AM.
Format: byear(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: DateTime Value
Returns an integer number between 0 and 59 representing the second fragment of the given time.
Format: second(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: Integer (4 bytes) Value
Returns an integer number between 0 and 59 representing the minute fragment of the given time.
Format: minute(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: Integer (4 bytes) Value
Returns an integer number between 0 and 23 representing the hour fragment of the given time.
Format: hour(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: Integer (4 bytes) Value
Returns an integer number between 1 and 31 representing the day from the date of the given time.
Format: day(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: Integer (4 bytes) Value
Returns an integer number between 1 and 12 representing the month from the date of the given time.
Format: month(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: Integer (4 bytes) Value
Returns an integer number between 1 and 9999 representing the year from the date of the given time.
Format: year(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: Integer (4 bytes) Value
Returns an integer number between 1 and 366 representing the day of the year for the given time.
Format: yearday(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: Integer (4 bytes) Value
Returns an integer number between 0 and 6 representing day of the week for the given time. Values are:
Format: weekday(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: Integer (4 bytes) Value
Returns an integer number between 0 and 86399 representing the second of the day for the given time.
Format: dayseconds(sourceTime)
Parameters:
sourceTime: DateTime value to perform operation on
Returns: Integer (4 bytes) Value
Data Value functions that you can use in expressions for calculated tags are listed here and are described in more detail below.
Returns the data value at the given timestamp. The data value can be either a raw value or an interpolated value. Note that this function may be slow as it accesses historical data.
Format: tagat(variable, dateTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the data value preceding the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagprev(variable, dateTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the data value preceding or including the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagprev2(variable, dateTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the data value following the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagnext(variable, dateTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the data value following or including the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagnext2(variable, dateTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the first good quality data value that precedes the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagprevgood(variable, dateTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the first good quality data value that precedes the given timestamp or occurs at the given time. Note that this function may be slow as it accesses historical data.
Format: tagprevgood2(variable, dateTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the first good quality data value that follows the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagnextgood(variable, dateTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the first good quality data value that follows the given timestamp or occurs at the given time. Note that this function may be slow as it accesses historical data.
Format: tagnextgood2(variable, dateTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the given number of data values preceding the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagprev(variable, dateTime, int)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
int: Integer indicating the number of values to return
Returns: (n) DataValue, a set of Timestamp, Value and Quality code
Returns the given number of data values preceding and including the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagprevn2(variable, dateTime, int)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
int: Integer indicating the number of values to return
Returns: (n) DataValue, a set of Timestamp, Value and Quality code
Returns the given number of data values following the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagnext(variable, dateTime, int)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
int: Integer indicating the number of values to return
Returns: (n) DataValue, a set of Timestamp, Value and Quality code
Returns the given number of data values following and including the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagnext2(variable, dateTime, int)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
int: Integer indicating the number of values to return
Returns: (n) DataValue, a set of Timestamp, Value and Quality code
Returns the given number of good quality data values preceding the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagprevgood(variable, dateTime, int)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
int: Integer indicating the number of values to return
Returns: (n) DataValue, a set of Timestamp, Value and Quality code
Returns the given number of good quality data values preceding and including the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagprevgood2(variable, dateTime, int)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
int: Integer indicating the number of values to return
Returns: (n) DataValue, a set of Timestamp, Value and Quality code
Returns the given number of good quality data values following the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagnextgood(variable, dateTime, int)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
int: Integer indicating the number of values to return
Returns: (n) DataValue, a set of Timestamp, Value and Quality code
Returns the given number of good quality data values following and including the given timestamp. Note that this function may be slow as it accesses historical data.
Format: tagnextgood2(variable, dateTime, int)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
dateTime: DateTime Value
int: Integer indicating the number of values to return
Returns: (n) DataValue, a set of Timestamp, Value and Quality code
Returns the name of the trigger that invoked this calculation.
Format: trgnamecur()
Returns: String Value
Returns the name of the trigger that invoked the previous calculation.
Format: trgnameprev()
Returns: String Value
Returns the data value of the trigger that invoked this calculation.
Format: trgcur()
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the last known calculated value.
Format: calcprev()
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns an element of the given array at the given position.
Format: elm(array, arrayPosition)
Parameters:
arrayPosition:
Returns: The array element as a generic value
Returns the value fragment of the given Data Value.
Format: val(dataValue)
Parameters:
dataValue: DataValue, a set of Timestamp, Value and Quality code
Returns: Raw DataValue type
Returns the value fragment of the given Data Value and sets the quality of the expression to "Good."
Format: val(dataValue)
Parameters:
dataValue: DataValue, a set of Timestamp, Value and Quality code
Returns: Raw DataValue type
Returns the timestamp fragment of the given Data Value.
Format: time(dataValue)
Parameters:
dataValue: DataValue, a set of Timestamp, Value and Quality code
Returns: DateTime Value
Returns the quality code fragment of the given Data Value.
Format: qualcode(dataValue)
Parameters:
dataValue: DataValue, a set of Timestamp, Value and Quality code
Returns: Unsigned Integer (4 bytes) Value
Returns true when the given data value is of good quality.
Format: isgood(dataValue)
Parameters:
dataValue: DataValue, a set of Timestamp, Value and Quality code
Returns: Boolean (true/false) Value
Returns true when the given data value is of bad quality.
Format: isbad(dataValue)
Parameters:
dataValue: DataValue, a set of Timestamp, Value and Quality code
Returns: Boolean (true/false) Value
Returns true when the given data value is of uncertain quality.
Format: isunc(dataValue)
Parameters:
dataValue: DataValue, a set of Timestamp, Value and Quality code
Returns: Boolean (true/false) Value
Returns true when the given data value contains a valid value.
Format: hasval(dataValue)
Parameters:
dataValue: DataValue, a set of Timestamp, Value and Quality code
Returns: Boolean (true/false) Value
Returns this value as the result; nothing will be logged.
Format: nologval()
Returns: DataValue, a set of Timestamp, Value and Quality code
The historical functions that you can use in expressions for calculated tags are listed here and are described in more detail below. These functions may be slower than expected as they access historical data.
tagfind - The first timestamp of the value that matches the given filtering criteria within the specified time interval
tagfindstate - The first timestamp of the value that matches the given state value within the specified time interval
tagavg - Average
tagtavg - Time Weighted Average
tagtotalize - Totalize
tagtotal - Total
tagmin - Minimum
tagmax - Maximum
tagdelta - Difference between the first and last good raw values for the given data variable and time range
tagrange - Difference between the maximum and minimum good raw values for the given data variable and time range
tagcount - Number of samples for the given data variable and time range
tagtimestate0 - Duration in State 0 for the given data variable and time range
tagtimestate1 - Duration in State 1 for the given data variable and time range
tagntrans - Number of Transitions between zero and non-zero state for the given data variable and time range
tagpctgood - Percent of the time for which data value had good quality in the given time interval
tagpctbad - Percent of the time for which data value had bad quality in the given time interval
tagtimegood - Duration of time for which the data value had good quality in the given time interval
tagtimebad - Duration of time for which the data value had bad quality in the given time interval
tagworstqual - Returns the worst value quality for the given data variable and time range
tagtime - Returns the time for which data values matched the given filter criteria, within the specified time interval
tagstddev - Standard deviation using 1/(N-1) calculation
tagstddev2 - Standard deviation using 1/N calculation
tagvariance - Variance using 1/(N-1) calculation
tagvariance2 - Variance using 1/N calculation
Returns the first timestamp of the value that matches the given filter criteria within the specified time interval. Note that this function may be slow as it accesses historical data.
Format: tagfind(variable, startTime, endTime, comparisonType, comparisonValue)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
comparisonType: String value representing comparison type, it can be one of the following:
== != > >= < <=
comparisonValue: Numeric value to compare with
Returns: DateTime Value
Returns the first timestamp of the value that matches the given state value, within the specified time interval. Note that this function may be slow as it accesses historical data.
Format: tagfindstate(variable, startTime, endTime, boolState)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
boolState: a boolean value representing the state to search for
Returns: DateTime Value
Returns the average value for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagavg(variable, startTime, endTime, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
percentGood: Numeric value in the range 0 to 100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the time weighted average value for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagtavg(variable, startTime, endTime, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
percentGood: Numeric value in range 0-100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the totalized value for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagtotalize(variable, startTime, endTime, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
percentGood: Numeric value in range 0-100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the total (sum) value for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagtotal(variable, startTime, endTime, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
percentGood: Numeric value in range 0-100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the minimum value for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagmin(variable, startTime, endTime, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
percentGood: Numeric value in range 0-100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the maximum value for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagmax(variable, startTime, endTime, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
percentGood: Numeric value in range 0-100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the difference between the first and last good raw values for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagdelta(variable, startTime, endTime, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
percentGood: Numeric value in range 0-100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the difference between the maximum and minimum good raw values for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagrange(variable, startTime, endTime, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
percentGood: Numeric value in range 0-100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the number of all samples for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagcount(variable, startTime, endTime, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
percentGood: Numeric value in range 0-100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns how long the value was in the zero state for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagtimestate0(variable, startTime, endTime, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
percentGood: Numeric value in range 0-100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns how long the value was in the not-zero state for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagtimestate1(variable, startTime, endTime, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
percentGood: Numeric value in range 0-100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the number of transitions between zero and not zero state for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagntrans(variable, startTime, endTime, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
percentGood: Numeric value in range 0-100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the percentage of time over the given time interval that the data value had good quality. Note that this function may be slow as it accesses historical data.
Format: tagpctgood(variable, startTime, endTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the percentage of the time over the given time interval that the data value had bad quality. Note that this function may be slow as it accesses historical data.
Format: tagpctbad(variable, startTime, endTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the time over which the data value had good quality in the given time interval. Note that this function may be slow as it accesses historical data.
Format: tagtimegood(variable, startTime, endTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the time over which the data value had bad quality in the given time interval. Note that this function may be slow as it accesses historical data.
Format: tagtimebad(variable, startTime, endTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the worst value quality for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagworstqual(variable, startTime, endTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the time over the specified time interval that data values match the given filter criteria. Note that this function may be slow as it accesses historical data.
Format: tagtime(variable, startTime, endTime, comparisonType, comparisonValue, percentGood)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
comparisonType: String value representing comparison type, it can be one of the following:
== != > >= < <=
comparisonValue: Numeric value to compare with
percentGood: Numeric value in range 0-100 indicating percentage of good samples in given time interval to return good status code for processed value
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the Standard Deviation (with Bessel's correction) for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagstddev(variable, startTime, endTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the Standard Deviation for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagstddev2(variable, startTime, endTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
Returns: DataValue, a set of Timestamp, Value and Quality code
Returns the Variance (with Bessel's correction) for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagvariance(variable, startTime, endTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
Returns: DataValue, a set of Timestamp, Value and Quality code
Return the Variance for the given data variable and time range. Note that this function may be slow as it accesses historical data.
Format: tagvariance2(variable, startTime, endTime)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
startTime: DateTime value indicating begin of the time interval to process data for
endTime: DateTime, TimeSpan or Numeric milliseconds value indicating end of the time interval to process data for
Returns: DataValue, a set of Timestamp, Value and Quality code
The metadata functions that you can use in expressions for calculated tags are listed here and are described in more detail below.
tagname - Name of the given data variable
tagdname - Display name of the given data variable
tagdesc - Description of the given data variable
tagvaltype - Value type for the given data variable. The returned values are: 0-Native, 1-Double, 2-Single, 3-SByte, 4-Int16, 5-Int32, 6-Int64, 7-Byte, 8-UInt16, 9-UInt32, 10-UInt64, 11-String, 13-Bool, 16-Duration
tagtype - Variable type for the given data variable. The returned values are: 0-Base, 1-Analog, 2-Decimal Analog, 3-Digital
tagunits - Engineering units for the given data variable
taghighval - High value from value range for the given data variable
taglowval - Low value from value range for the given data variable
tagsource - Source data point name for the given data variable
Returns the configured name for the given data variable.
Format: tagname(variable)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
Returns: String Value
Returns the configured display name for the given data variable.
Format: tagdname(variable)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
Returns: String Value
Returns the configured description for the given data variable.
Format: tagdesc(variable)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
Returns: String Value
Returns an integer value that represents the data value type. Valid values are:
|
0 - Native |
7 - Byte |
|
1 - Double |
8 - UInt16 |
|
2 - Single |
9 - UInt32 |
|
3 - SByte |
10 - UInt64 |
|
4 - Int16 |
11 - String |
|
5 - Int32 |
13 - Bool |
|
6 - Int64 |
16 - Duration |
Format: tagvaltype(variable)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
Returns: Integer (4 bytes) Value
Return integer value representing data variable type. Valid values are:
Format: tagtype(variable)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
Returns: Integer (4 bytes) Value
Returns the configured engineering units for the given data variable.
Format: tagunits(variable)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
Returns: String Value
Returns the configured high value from value range for the given data variable.
Format: taghighval(variable)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
Returns: Double Value
Returns the configured low value from value range for the given data variable.
Format: taglowval(variable)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
Returns: Double Value
Returns the configured source data point name for the given data variable.
Format: tagsource(variable)
Parameters:
variable: Internal data variable, i.e. {{fully_qualified_variable_name}}
Returns: String Value
See also:
Creating a Calculation Trigger
Scheduling Recalculation Tasks
Performance Calculation Enhancements
