Function Block Execution Parameters - ABB Relion 670 series Engineering Manual

Section 5
Protection and control engineering
5.1.4
44
A function block can contain more signals than needed in that application part.
Hide unused signals to get a clear picture.
Signals are located on both sides of the middle position up and down. When there
is space left, move some signals up or down for a better visibility and connection
routing.
Boolean input and output signals may need to be inverted to fulfill the logic. ACT
supports to add the inversion logic to a binary signal.
The input signal on glue logic function blocks can only be inverted
if a glue logic function block with lower execution order in the
same cycle time is available. Similar, the output signal can only be
inverted if a glue logic function block with higher execution order
in the same cycle time is available. Up to two input signals and two
output signals can be inverted for glue logic blocks in the same
cycle time.
Even though current is injected to the IED and the IED is connected
to PCM600 in online mode, the signal value in ACT is shown as zero.
All not mandatory input signals have a default value that will be used when not
connected.

Function block execution parameters

Three function block execution parameters have influence on the runtime execution
of the function block within the application configuration.
• Execution order
• Cycle time
• Instance number
Each time a new function block is selected these parameters have to be selected
from the drop down lists in ACT. Depending on the function block type not all
three parameters are selectable. The cycle time may be predefined to one value.
The instance number is a counter for the total possible number of function blocks
of that type used within an application configuration.
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.
example how the drop down list could look like.
1MRK511240-UEN B
Figure 29 shows an
670 series
Engineering Manual