Option 2.2.2. Data Triggered Logging

Options to configure data triggered logging are as follows.

1	On point value update
2	On point alarm state
3	Data triggered logging guidelines

1	On point value update

On point value update logs values when a selected point is updates.

Configuration for the On point value update group includes:

Option	Description
Checkbox	Enables On point value update option.
Radio buttons	Check one option to determine the conditions for when the values of all the points in the table will be logged.
	Point being logged	Each point that was added to the table after Point being logged was checked (and does not have a customized logging condition) is logged when its value is updated.
	Specific point	Selected point is updated. Enter a Point ID for this option. Click the Browser button $image\help0135.gif$ to open the Select a Point browser or Click the Popup Menu button $image\help0136.gif$ to display options for selecting a point.
Deadband	filter out changes in the value of the selected point type before triggering a logging event–for either the point being logged or the specific point. Configuration in the Deadband group includes:
	Checkbox	Checked enables deadband.
	Value	Floating point number. Deadband value
	Radio buttons	Check one to specify how to evaluate the entered value to trigger another logging event.
		Absolute	Absolute value
		Percent	Percent of the last value.
	The point's value must change more than the Deadband value before another logging event will be triggered.

Deadband Example 1. Absolute Value

An Absolute Deadband value is 5.0.

Point Value	Result
200.0	First logging event
201.3	No Logging event
204.2	No Logging event
205.1	Logging event triggered.

Deadband Example 2. Percent Value

A Percentage Deadband value is 5.0

Point Value	Result
200.0	First logging event
201.3	No Logging event
204.2	No Logging event
205.1	No Logging event
210.2	Logging event triggered.

Note: An explicit deadband of 0 specifies that the point must have actually changed as opposed to having been updated by the point manager.

2	On point alarm state

On point alarm state logs point values when a selected point goes into one or more selected alarm states.

Configuration for the On point alarm state group includes

Option		Description
Checkbox	Enables the on point alarm state option.
Field	Entered the point to be evaluated. Aids to find the point include:
		Opens the Select a Point browser
		Displays a Popup menu with options for selecting a point.
	Important: For On point alarm state to work successfully, you must define alarm limits for the trigger point. For example, if you select a Point ID and choose its Alarm High state, logging in the table will occur each time the point enters the Alarm High state.
Alarm limits	One or more alarm states must be checked. The values for these alarm states is specified on the Alarm tab in the selected point's Properties dialog box.
	Alarm high
	Warning high
	Warning low
	Alarm low

$image\Tips.gif$ Tip: Click Use Defaults to reset the Logging Conditions to their default values. The default is to log data periodically every 5 minutes.

3	Data triggered logging guidelines

You can combine On point value update logging with On point alarm state logging.

If you do not define any logging conditions under Timed/Gated Logging, then data will only be logged into the table when the trigger occurs.

You can combine triggers. When you combine triggers, logging occurs when either of the triggers occurs.

Example

You want to log a set of points when POINT_A is updated or when POINT_B is in Alarm High state. Do the following.

Check the On point value update check box.
Enter POINT_A in the Point field.
Check the On point alarm state check box.
Check the Alarm High check box.
Enter POINT_B in the Point field.

More information

$image\Buttongraysm.png$

Step 2.2. Configure default logging conditions for the Data Log table.