Hitachi Relion 670 Series Applications Manual page 306

Section 14
Logic
14.6.2.1 Configuration
Logic is configured using the ACT configuration tool in PCM600.
Execution of functions as defined by the configurable logic blocks runs according to a fixed sequence
with different cycle times.
For each cycle time, the function block is given an serial execution number. This is shown when
using the ACT configuration tool with the designation of the function block and the cycle time, see
example below.
IEC09000695 V2 EN-US
Figure 153:
IEC09000310 V2 EN-US
Figure 154:
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 Application
The Fixed signals function (FXDSIGN) has nine pre-set (fixed) output 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/
300
Example designation, serial execution number and cycle time for logic function
Example designation, serial execution number and cycle time for logic 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.
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