Boolean input and output signals may need to be inverted to fulfil the logic. The
Application Configuration tool supports the adding of inversion logic to a binary
signal.
All input signals have a default value that is used when the signals are not connected
in the configuration.
The input signal on glue logic function blocks can be inverted only if
a glue logic function block with lower execution order in the same
cycle time is available. Similarly, 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.
5.1.3
Function block execution parameters
Three function block execution parameters influence the runtime execution of the
function block within the application configuration.
•
Execution order
•
Cycle time
•
Instance number
When a new function block is inserted, these parameters are shown in the Function
Block Instance dialog box in Application Configuration. The three parameters are
selectable or not selectable depending on the function block type. The cycle time is
predefined to one value. The instance number is a counter for the total possible
number of function blocks of that type used within the application configuration.
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.
Section 5
1MRS759117 A
Protection and control engineering
68
REX640
Engineering Manual
