ClearSCADA

ClearSCADA contains a number of objects which can be used to store a value, the following table documents the differences between them to help decide which object type should be used

Property Internal Point Database Variable Parameter Comment
Database icon Dark Grey
Yellow Light Grey  
Which data steam are the values stored within? Data stream Data stream Config stream The choice of which steam is important should you export/import the object via SDE. SDE files only contain the config stream so on import the internal point and database variable will have no value
Permission required to change value Control Control Configure Generally operators will have the Control permissions but not Configure, this can be used to control who can change the value
Alarms Analogue and digital: Yes
String and Time: No
No No  
Historic Analogue and digital: Yes
String and Time: No
No No  
Value change logging Standard event logging Standard event logging Config Changes table, if enabled
Includes in count for licensing? Yes No No  
Included data types Analogue
digital
string
time
Lots, including (array for some):
Boolean,
byte
colour (RGB)
double
floats
strings
time
variants
Postal address
double
grid reference
object link
parameter table
string
 
Triggers logic on-input changed Analogue and digital: Yes
String and Time: No
No No