Rockwell-automation FactoryTalk View Site Edition Users Guide Bedienungsanleitung PDF herunterladen (Seite 592)

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FACTORYTALK VIEW SITE EDITION USER’S GUIDE

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Using the DataLogSnapshot command

You can use the DataLogSnapshot command with either of these parameters:

 DataLogSnapshot <component> (where <component> is a data log model name)

records tag values for all tags in the specified model at the instant the command is run.

 DataLogSnapshot * records tag values for all tags in all running models at the instant

the command is run.

You can use the DataLogSnapshot command anywhere you can type a FactoryTalk View

command or macro. For example, you can use the command as the action for an event (an

example of how to do this follows).

To provide operators with a way to log on demand at run time, create a button object in a

graphic display, or a display key or client key, that uses DataLogSnapshot as the press

action.

Example: Creating an event for on-demand logging

To create an event that will trigger logging when an alarm occurs:

1. In the Data Log Models editor, in the Log Triggers tab, select the option On

Demand.

2. Open the Event editor. Create an expression such as:

If alm_in_alarm(motor_fault) and new_batch_started then 1

else 0

3. In the Event editor’s Action field, type DataLogSnapshot <component> where

component is the name of the data log model.

When the tag called motor_fault goes into alarm, and the tag called new_batch_started is

1, the DataLogSnapshot <component> command runs. All tags in the model will then be

logged (not just the tag in alarm).

Combining logging

You can combine periodic or on-change logging with on-demand logging, to capture data

at particular times and when a particular event occurs.

To combine logging

1. In the Data Log Models editor, in the Log Triggers tab, select the Periodic or On

Change option.

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