Fixed Signal Function Block Fxdsign; Identification; Application - ABB RELION 650 Series Applications Manual

Section 14
Logic
IEC09000310 V2 EN-US
Figure 138: Example designation, serial execution number and cycle time for logic
The execution of different function blocks within the same cycle is determined by the order of
their serial execution numbers. Always remember this when connecting two or more logical
function blocks in series.
14.7

Fixed signal function block FXDSIGN

14.7.1

Identification

Function description
Fixed signals
14.7.2

Application

The Fixed signals function FXDSIGN generates nine pre-set (fixed) signals that can be used in
the configuration of an IED, either for forcing the unused inputs in other function blocks to a
certain level/value, or for creating certain logic. Boolean, integer, floating point, string types of
signals are available.
One FXDSIGN function block is included in all IEDs.
Example for use of GRP_OFF signal in FXDSIGN
The Restricted earth fault function REFPDIF can be used both for auto-transformers and
normal transformers.
When used for auto-transformers, information from both windings parts, together with the
neutral point current, needs to be available to the function. This means that three inputs are
needed.
272
function that also propagates timestamp and quality of input signals
Always be careful when connecting function blocks with a fast cycle time to
function blocks with a slow cycle time.
Remember to design the logic circuits carefully and always check the execution
sequence for different functions. In other cases, additional time delays must be
introduced into the logic schemes to prevent errors, for example, race between
functions.
IEC 61850
identification
FXDSIGN
IEC09000310-2-en.vsd
IEC 60617
identification
-
1MRK 505 363-UEN A
SEMOD167904-2 v2
ANSI/IEEE C37.2
device number
-
Application manual
IP15080-1 v2
M15322-3 v11