Execution Order And Feedback Loops - ABB Relion Series Engineering Manual

1MRS757810 C
5.1.4
REC615 and RER615
Engineering Manual
GUID-4129D712-CD43-4729-8FE4-27FFE758D151 V1 EN
Figure 44: Application Configuration tool: an example of function block
organization parameters
The Cycle Time is automatically set and it cannot be modified.
To automatically calculate the execution order, click Calculate
Execution Order on the tool bar.

Execution order and feedback loops

It is possible to draw multi-layer configuration logic that contains feedback loops with
the Application Configuration tool. The execution order of logic functions is
calculated automatically in the Application Configuration tool, but the execution
order can also be set manually. 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.
To perceive accurate time stamps from binary input signals to
function blocks, direct logic connection should be used in the
Application Configuration tool. Due to internal execution order, time
stamps may not be accurate if additional logic is used to connect
priority signals to function blocks.
Protection and control engineering
Section 5
69