ABB ACSM1 - Page 327

Standard function blocks
327
SR
(10033)
Illustration
Execution time 0.38 µs
Operation The output (Q1) is 1 if the set input (S1) is 1. The output will retain the previous output
state if the set input (S1) and the reset input (R) are 0. The output is 0 if the set input is
0 and the reset input is 1.
Truth table:
Inputs Set input (S1): Boolean
Reset input (R): Boolean
Outputs Output (Q1): Boolean
SR
48
TLA1 1 msec (1)
S1
R
Q1
Q1(48)
S1 R Q1
previous
Q1
000 0
001 1
010 0
011 0
100 1
101 1
110 1
111 1
Q1
previous
is the previous cycle output value.