Product specifications

Alarm Analysis Configuration
3BDS011222-510 B 147
Item Syntaxes
One or more OPC Items can be added to each of the OPC Groups. The AddItems
standard OPC function is used. Each Item is identified by a vendor specific string. In
that string the colon “:” is used as a separator between the property name and the
aspect name.
The OPC Data Access Server recognizes the following OPC Item syntaxes, the first
three with the best performance:
1. {Object ID}{Aspect ID}:propertyName
Example:
{DA6BFD30-E1D3-11d2-B126-080009DCF329}{DA6BFD30-E1D3-
11d2-B126-080009DCF329}:VALUE
This syntax is guaranteed to always uniquely identify an item.
2. {Object ID}:propertyName
Example:
{DA6BFD30-E1D3-11d2-B126-080009DCF329}:VALUE
true Keyword that can be used as one of two possible
boolean values
false Keyword that can be used as one of two possible
boolean values
If numbers are used as property names in the Expression field you must quote
them. For example:
$’1’>3.
For better performance always include aspect whenever specifying properties.
Note that regardless of which syntax you use, the ItemID must always be unique
in the system.
Table 7. Valid Operators for the Alarm Expression Aspect (Continued)
Operator Description