How to count tags
GENESIS64™ Basic SCADA
Data to be used for displaying alarm conditions and screen/table need to be defined as asset tag on AssetWorX™.
Example
Display average temperature of two rooms
Number of asset tags are defined during configuration of the tag database in AssetWorX™. Counting method of tags differs according to building method of asset tags.
Building method1
To assign an asset tag to display “average temperature of room 1 and 2” (when calculating the average temperature of room 1 and 2 in the programmable controller outside the SCADA), the following three tags are necessary: “room 1 temperature”, “room 2 temperature”, and an expression for “average temperature of room 1 and 2”.
Building method2
To assign a defined formula to calculate “average temperature of room 1 and 2” on the display, two asset tags “temperature of room 1” and “temperature of room 2” are necessary.
Timing of counting tags
All tags are counted at a start of a server according to the configuration of the AssetWorX™ tag database.
How to count tags when accessing from multiple clients
Tags are counted at the timing of server starting, the number of clients being accessed will not affect the number of tags counted.
How to count tags when Hyper Historian™ is used
Both asset tags and Hyper Historian™ tags are counted.
GENESIS64™ Advanced
Tags are counted by data set unit for read and write.
Example 1
Display average temperature of two rooms on the screen
Only one data set is displayed with this setting, however, it is counted as two tags since two data sets are read.
Example 2
Set temperature device of a programmable controller to “screen display” and “alarm conditions”
Only one “temperature” data set is accessed for read and write with this setting, it is counted as one tag.
Timing of counting tag- Catch and release
Tags are counted in runtime at the start of reading from/writing to external data sources. GENESIS64™ Advanced stops counting (releasing tags) upon completion of reading from/writing to external data (e.g. closing a screen).
Example
System to display temperature device of a programmable controller and monitor alarm of operating device
Tag is counted as one tag upon start of alarm monitoring. Another tag is counted when opening a display.
● : Counted – : Not counted
Tag count increase and decrease
| |
Start |
Alarm
monitoring
start |
Display |
Close
display*1 |
Alarm
monitoring
end |
Temperature
tag |
– |
– |
● |
– |
– |
| Operating tag |
– |
● |
● |
● |
– |
| Total tags |
0 |
1 |
2 |
1 |
0 |
*1. After closing the screen, connection is maintained for a while and counting status is kept to promptly redisplay.
How to count tags when viewed from multiple clients
When viewing the same screen, the total number of tags on one screen are counted. When accessing other screens, the total number of tags on accessed screens are counted.
Example 1
When multiple users display the same screen (same data set)
Only room 1 temperature is read, it is counted as one tag.
Example 2
When multiple users display different screens (different data sets)
Room 1 and 2 temperatures are read, it is counted as two tags.