ABB REC 561 User Manual page 165

1MRK 580 161-XEN
Page 4 - 30
Configurable logic
Each block of 16 signals is protected from being interrupted by other logic
application tasks. This guarantees the consistency of the signals to each
other within each MOVE function block.
Synchronization of signals with MOF should be used when a signal which
is produced outside the slow logic is used in several places in the logic
and there might be a malfunction if the signal changes its value between
these places.
Synchronization with MOL should be used if a signal produced in the
slow logic is used in several places outside this logic, or if several signals
produced in the slow logic are used together outside this logic, and there is
a similar need for synchronization.
Fig. 10 shows an example of logic, which can result in malfunctions on
the output signal from the AND gate to the right in the figure.
Fast logic
Function 1
&
Fig. 10 Example of logic, which can result in malfunctions
Fig. 11 shows the same logic as in Fig. 10, but with the signals synchro-
nized by the MOVE function blocks MOFn and MOLn. With this solution
the consistency of the signals can be guaranteed.
Fast logic
Function 1
&
Fig. 11 Example of logic with synchronized signals
MOFn and MOLn, n=1-3, have 16 inputs and 16 outputs. Each INPUTm
is copied to the corresponding OUTPUTm, where m presents the serial
number of the input and the output in the block. The MOFn are the first
blocks and the MOLn are the last blocks in the execution order in the slow
logic.
ABB Network Partner AB
Slow logic
Function 2
Function 3
Slow logic
MOFn
Function 2
MOVE
Function 3
(X80161-11)
Version 1.0-00
Fast logic
&
(X80161-10)
Fast logic
MOLn
MOVE
&