Certain tag types support Interval and Offset fields to define when and how often a timed activity occurs. Examples of timed activities include:
Interval and Offset fields are Duration Literals. For example T#1m30s represents 1 minute and 30 seconds.
The Interval field defines how often the activity occurs. For example an Interval of T#5s sets the timed activity to occur every 5 seconds.
Fernhill SCADA will attempt to perform the timed activity at the interval. However, Fernhill SCADA does not guarantee the timed activity is performed at this interval. External and internal influences such as computer load, and the response time of external devices, may result in timed activities being delayed or dropped.
Both the Interval and Offset fields define when a timed activity occurs:
Some examples of timed activity:
Interval | Offset | Comment | Event times |
---|---|---|---|
T#500ms | T#0s | Every 500 milliseconds at the start of second and at the start of the second plus 500ms | 12:43:00.000 12:43:00.500 12:43:01.000 |
T#500ms | T#250s | As above, but offset by 250ms | 12:43:00.250 12:43:00.750 12:43:01.250 |
T#10s | T#0s | Every 10 seconds at the 10-second boundary | 12:43:00.000 12:43:10.000 12:43:20.000 |
T#10s | T#5s | As above but offset by 5 seconds | 12:43:05.000 12:43:15.000 12:43:25.000 |
To learn about duration literal values.
For the meaning of terms used in Fernhill SCADA.