TrendX options in Start Trigger tab

Use this tab to configure the Start Trigger event for a data logging instance.
TIP: To open the
Start Trigger
 tab: From the Controller Organizer, expand the Assets and Trends folders, right-click the trend, and choose
Properties
. The RSTrendX Properties dialog box is displayed. Select the
Start Trigger
 tab.
Options
Parameter
Usage
No Trigger
Select this check box if you want data logging to begin as soon as the trend is started, and continue until the stop trigger occurs. If the
Number of Captures
 parameter is larger than 1, the next data logging instance begins as soon as the previous instance ends.
If you clear this check box, data logging begins when the start trigger is turned on, and continues until the stop trigger occurs. If the
Number of Captures
 parameter is larger than 1, the start trigger is monitored again once the previous data logging instance ends.
Tag Trigger Conditions
Tag Trigger Summary
Displays all of the entered tag trigger clauses.
AND
Click this button to append the word
AND
 to the end of the selected tag trigger clause in the
Tag Trigger Summary
 list; the next tag trigger clause is selected and displayed in the
Tag
,
Operation
,
Target Value
, or
Target Tag
 controls automatically. If the next clause is not available, those controls are cleared for a new clause.
OR
Click this button to append the word
OR
 to the end of the selected tag trigger clause in the
Tag Trigger Summary
 list; the next tag trigger clause is selected and displayed in the
Tag
,
Operation
,
Target Value
, or
Target Tag
 controls automatically. If the next clause is not available, those controls are cleared for a new clause.
Delete
Click this button to remove the selected tag trigger clause from the
Tag Trigger Summary
 list.
Tag
The source tag that is monitored to start data logging.
Operation
The method used to evaluate the tag against either the
Target Value
 or the
Target Tag
. When the operation is evaluated as TRUE, data logging begins.
Tip:
 Use the
Trigger Level Equal
 option to avoid missing data samples due to:
  • Gaps in the sampling period that can be missed when using the
    Exact Equal
     option.
  • A lack of floating-point precision in the trigger value.
The
Trigger Level Equal
 option interpolates data by comparing the previous sample value to the current sample value. The trigger is met when either of the following conditions are true:
  • The previous sample value is less than the
    Target Value
    or
    Target Tag
     and the current sample value is greater than or equal to the
    Target Value
    or
    Target Tag
    , or
  • The previous sample value is greater than the
    Target Value
    or
    Target Tag
     and the current sample value is less than or equal to the
    Target Value
    or
    Target Tag
    .
Target Value
Choose this option if you want the
Operation
 to be performed on the
Tag
 and the
Target Value
. This value can be either an integer or a floating point value. If you enter an integer, you can enter it as a binary, an octal, a decimal, or a hexadecimal number, with the leading BASE#.
Target Tag
Choose this option if you want the
Operation
 to be performed on the
Tag
 and the
Target
 Tag.
Pre-Sampling
Samples
Specifies the number of pre-samples to keep for data logging. Valid values range from 0 to 1000; the default value is 100.
Time Period
Specifies the number of pre-samples to keep for the data logging by a time frame.
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