ABB 650 series Applications Manual page 187

1MRK 511 423-UEN A
Bay control REC650 2.2 IEC
Application manual
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 93: Example designation, serial execution number and cycle time for
logic function
IEC09000310 V2 EN-US
Figure 94: Example designation, serial execution number and cycle time for
logic function that also propagates timestamp and quality of input
signals
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.
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
IEC09000310-2-en.vsd
Section 9
Logic
181