Execution Order And Feedback Loops - ABB Relion 615 Series Engineering Manual

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5.1.4
615 series ANSI
Engineering Manual
GUID-4129D712-CD43-4729-8FE4-27FFE758D151-ANSI V1 EN
Figure 45: Application Configuration tool: an example of function block
organization parameters
The Cycle Time is automatically set to 2.5 ms (50 Hz) or to 2.083 ms (60 Hz) and it
cannot be modified. Depending on the function block type and the 615 series product,
only one or both possibilities may be available.
To automatically calculate the execution order, click Calculate
Execution Order on the tool bar.

Execution order and feedback loops

With the Application Configuration tool it is possible to draw multi-layer configuration
logic that contains feedback loops. The execution order of logic functions is calculated
automatically in the Application Configuration tool, but the execution order can be set
manually also. If the automatically calculated value causes the function to be executed
one task cycle time after the other logic functions in the same loop, the execution order
number can be set manually to prevent delays, for example, in output activation.
The following example shows a simple situation where the execution order causes one
cycle time delay if the NOT port is executed in the order determined by the automatic
calculation.
Protection and control engineering
Section 5
69