The Execution Order and Instance Number are a combination that is predefined
within a product. It is possible to select a pair out of the list. Figure 33 shows an
example how the drop down list could look like.
IEC08000269 V1 EN
Figure 33: ACT: function block organization parameters
A minus sign in front of the cycle time, for example -200ms, indicates
that the application is time driven, otherwise the application is
analogue data driven. Analogue data driven applications require
sample values from Analogue input modules - in case the physical
module is broken, applications are not executed. Time driven
applications are executed periodically regardless of the status of the
analogue signal processing.
The Cycle Time can be selected to 5, 20 or 100 ms. Depending on function block type
and the 650 series product only one, two or all three possibilities may be available.
The combination Execution Order, Instance Number is predefined by ABB. Mainly
for basic logic function blocks like for example AND, OR, a set of combinations
spread over the full range of execution orders is available. This gives the possibility to
select a combination which fits to the execution order range needed in that application
part.
Application configuration cycle time and execution order organization
The application execution within the 650 series products is organized in three time
classes, see
Figure 34.
1MRK 511 284-UEN A Section 5
Protection and control engineering
650 series 53
Engineering manual
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