TrnBrowseOpen Fields

ACQERROR

Acquisition error.

6

Numeric value (integer).

CLUSTER

Cluster name.

16

The name of the cluster the trend tag is associated with.

COMMENT

Comment

254

A user-defined string.

DEADBAND

The deadband set for a trend tag.

16

A numeric value (real) that indicates how much the value of a trend tag can fluctuate within a defined threshold without updates being sent through to the system.

The threshold is represented as a percentage of the tag's engineering range. The default value is 0 (zero), which captures every value change.

ENG_UNITS

Engineering units.

8

The engineering units that the value represents.

The predefined values (see below) are in the Help.dbf in the bin directory, but the user may specify it as a free text:

%, Amps, deg, ft, ft/min, ft/s, ft/sec, gal, gal/h, gal/min, gal/s, gal/sec, Hz, kg, kg/h, kg/min, kg/s, kg/sec, km/h, kPa, kW, litres, lt, lt/h, lt/min, lt/s, lt/sec, m/min, m/s, m/sec, metres, Rev, Rev/h, RPM, t, t/h, Tonnes, Volts, Watts.

EQUIPMENT

The name of the associated piece of equipment.

254

This can be a name that represents a single piece of equipment, or a name that also reflects the location of the equipment within the equipment hierarchy (where a period (.) is used to indicate levels in the hierarchy).

EXPRESSION

Logged variable name.

65

The logged variable name (<clustername>.<tagname>).

If the expression contains simple Cicode containing a single tag name, such as "LT131" or "LT131<1000", the tag name is returned (in both these cases LT131).

If the expression contains a function call or more than one tag name, an empty string is returned.

FILENAME

File where the trend data is to be stored.

253

The complete path to the file or a path substitution.

FILES

The number of history files stored on the hard disk (for this tag).

4

The maximum number of files that can specifies per trend tag is 999.

FORMAT

Trend tag format.

11

The format of the variable/expression being logged.

The format is used by the trend scales and trend cursor displays.

HISTORIAN

Determines if the trend tag will be included in an automated configuration process within the Historian environment.

6

True or False (blank).

ITEM

Name of equipment item.

63

The name configured in the trend tag's Item Name field.

LSL

Lower specification limit.

16

This value is used by SPC tags as the lower limit to determine process capability.

When used in conjunction with the USL, it provides a tolerance for your process.

NAME

Trend tag name.

79

The name assigned to the trend data.

PRIV

Privilege.

16

Numeric value (integer) that represents the level of privilege an operator requires to display trend data.

SAMPLEPER

Sample period of the trend.

16

Sampling periods of greater than one second use the format hh:mm:ss.

If a single digit is used without the colon (:), it will be represent seconds.

Sampling periods of less than one second are entered as decimals. For example, a period of 200 milliseconds would be 0.2.

SDEVIATION

Standard deviation.

16

For SPC tags, this is the calculation override for process standard deviation (s bar).

SPCFLAG

SPC flag.

4

Indicates that a tag is a Statistical Process Control (SPC) tag.

STORMETHOD

Storage method for the data.

16

"Scaled" or "Floating Point".

SUBGRPSIZE

The size of each SPC subgroup.

8

Indicates the size of the subgroups for SPC tags.

Valid values are 1 - 25 inclusive.

TAGGENLINK

Indicates if the tag was imported from an I/O device.

32

Name of the I/O device from which this tag was generated.

TIME

File synchronization time.

32

The time of day when the beginning of the history file is synchronized (in hh:mm:ss).

The time is specified in Greenwich Mean Time, not the local time zone.

TRIGGER

The variable tag that triggers data logging.

254

The configured tag name (<clustername>.<tagname>).

If the trigger contains simple Cicode containing a single tag name, such as "LT131<50", the tag name is returned (in this case LT131).

If the expression contains a function call or more than one tag name, an empty string is returned.

TYPE

Trend type.

16

"1" - Periodic

"2" - Event

"3" - Periodic event.

USL

Upper specification limit.

16

This value is used by SPC tags as the upper limit to determine process capability.

When used in conjunction with the LSL, it provides a tolerance for your process.

XDOUBLEBAR

Process mean.

16

For SPC tags, determines the calculation override for process mean (X double bar).