ABB RELION REX640 - 3.21.8.3 Signals; 3.21.9 RS flip-flop, volatile RS; 3.21.9.1 Function block; 3.21.9.2 Functionality

Table 309: Truth table for SR flip-flop
S R Q
0 0 0
1
0 1 0
1 0 1
1 1 1
3.21.8.3 Signals
Table 310: 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 311: SR Output signals
Name Type Description
Q BOOLEAN Q status
NOTQ BOOLEAN NOTQ status
3.21.9 RS flip-flop, volatile RS
3.21.9.1 Function block
Figure 171: Function block
3.21.9.2 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.
The statuses of outputs
Q and NOTQ are not retained in the nonvolatile
memory.
1
Keep state/no change
Basic functions 1MRS759142 F
298 REX640
Technical Manual