Determining the Update Rate
Use
Since the various tags, which together form the subscription items in a notification, can have different update rates, PCo determines a common update rate for this group of tags.
Prerequisites
-
You have specified a minimum update rate on the Modbus Agent tab (see: Modbus Agent Tab).
-
You have specified an update rate for each tag on the Tag Definition tab (see: Tag Definition Tab).
Features
The PCo system determines the update rate to be used using the minimum update rate and the update rates that you have defined for the individual tags on the Tag Definition tab. This is always the case if you have entered multiple tags on the Tag Definition tab. The smallest value that you have entered for the tags is always used. This value cannot be smaller than the minimum update rate.
Example
Example 1
|
Update Rate |
Input Value |
|---|---|
|
tag01 |
1000 ms |
|
tag02 |
500 ms |
|
Minimum Update Rate |
20 ms |
Result: In this case, the update rate of tag02 500 ms is used for all tags.
Example 2
|
Update Rate |
Input Value |
|---|---|
|
tag01 |
1000 ms |
|
tag02 |
500 ms |
|
Minimum Update Rate |
2000 ms |
Result: In this case, the minimum update rate of 2000 ms is used for all tags because the update rate used must not be smaller than the minimum update rate.
Example 3
|
Update Rate |
Input Value |
|---|---|
|
tag01 |
1000 ms |
|
tag02 |
500 ms |
|
Minimum Update Rate |
0 ms |
Result: The update rate of tag02 500 ms is used for all tags.