ABB Relion 620 Series - Page 164

Functionality
The SR flip-flop output Q can be set or reset from the S or R inputs. S input has a
higher priority over the R input. Output NOTQ is the negation of output Q.
The statuses of outputs Q and NOTQ are not retained in the nonvolatile
memory.
Table 136: Truth table for SR flip-flop
S R Q
0 0 0
1
0 1 0
1 0 1
1 1 1
Signals
Table 137: SR Input signals
Name Type Default Description
S BOOLEAN 0=False Set Q output when
set
R BOOLEAN 0=False Resets Q output
when set
Table 138: SR Output signals
Name Type Description
Q BOOLEAN Q status
NOTQ BOOLEAN NOTQ status
3.17.1.13 RS function block
Function block
Figure 85: Function block
Functionality
The RS flip-flop output Q can be set or reset from the S or R inputs. R input has a
higher priority over the S input. Output NOTQ is the negation of output Q.
1
Keep state/no change
Basic functions 1MRS757644 H
164 620 series
Technical Manual