Signals And Signal Management; Function Block Execution Parameters - ABB 650 Series Engineering Manual

Section 5
Protection and control engineering
5.1.3
5.1.4
52

Signals and signal management

A function block has set of input and output signals.
A function block can contain more signals than needed in that application part. A
signal that is not used in a particular application is possible to hide in the function
block view in ACT. It is not necessary to connect all inputs and outputs at a function
block. If not connected, the signals always have a default value. The default value can
be seen when hove over the signal with the mouse.
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 probably 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. In
fixed mode user selects parameters from the drop down lists in ACT. In automatic
mode best suitable instance is selected automatically. 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.
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650 series
Engineering manual