ABB RELION 670 Series Applications Manual page 340

Section 13
Logic
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 171: Example designation, serial execution number and cycle time for logic function
IEC09000310 V1 EN-US
Figure 172: Example designation, serial execution number and cycle time for logic function
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.
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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.
IEC09000695_2_en.vsd
IEC09000310-1-en.vsd
1MRK 505 337-UUS A
Application manual