Product specifications

Property Transfer
480 3BDS011222-510 B
The different fields in Figure 290 are described below:
Writing on many properties with Property Transfer Definition Aspect
When writing on many properties with the same cycle time and to the same OPC
Server, problems can arise. For example, the OPC Server for AC 800M can not
handle more than 50 simultaneous write operations per OPC group.
If you for example want to write on 60 properties with the same cycle time of 6000
ms, to an OPC Server for AC 800M, it is possible to "spread out" the cycle times
using the Update rate input field in the Property Transfer Aspect (see Figure 290
and Table 29).
To avoid more than 50 simultaneous write operations, you can for example use 3
different Property Transfer Aspects with the different cycle times:
• 5999 ms for 20 properties
• 6000 ms for 20 properties
Table 29. Property Transfer Aspect
Aspect The destination aspect name.
Property A destination property in the selected aspect.
Expression Source expression.
Substitution
Value
This value will be transferred if the source
expression results in bad quality.
Abs. Deadband Absolute deadband. An absolute numeric range
through which the value can be varied without
initiating a transfer.
Update rate The shortest time between two consecutive
property transfers.
Enabled Transfer Enable/disable all property transfers defined in
this aspect.
In the Expression text field you can use the property name as a short reference if
the property is defined on the same object as the property transfer aspect.