ABB Relion 670 Series Applications Manual page 366

Section 13
Logic
IEC09000695 V2 EN-US
Figure 193: Example designation, serial execution number and cycle time for logic function
IEC09000310 V2 EN-US
Figure 194: Example designation, serial execution number and cycle time for logic function that
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.
13.6 Fixed signal function block FXDSIGN
13.6.1 Application
The Fixed signals function (FXDSIGN) has 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.
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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.
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