IEC09000720-1-en.vsd
IEC09000720 V1 EN
Figure 29:
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 3, 8 or 100 ms. Depending on function block
type and the 670 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 670 series products is organized in three time
classes, see
.
1MRK511240-UEN B
Section 5
Protection and control engineering
670 series
45
Engineering Manual
