Rockwell Automation DeviceLogix System User Manual - Manual (Page 99)

Publication RA-UM003B-EN-P - February 2010 99
Navigate the Old Ladder Editor Interface Chapter 4
Set Dominant Latch
When using a set dominant latch, the accompanying reset element
must appear before the SRL element. Refer to the truth table for
information about the set dominant latch.
Reset Dominant Latch
When using a reset dominant latch, the accompanying reset element
must appear after the RSL element. Refer to the truth table for
information about the reset dominant latch.
Function Reset Input (Set) Output Value at
time = t
0
Output Value at
time = t
0+1
SR
set dominant
(A set dominant
block goes to the
set state if both
inputs are true.)
0 0 0 0
0 1 0 1
1 0 0 0
1 1 0 1
0 0 1 1
0 1 1 1
1 0 1 0
1 1 1 1
RS
reset dominant
(A reset dominant
block goes to the
false state if both
inputs are true.)
0 0 0 0
0 1 0 1
1 0 0 0
1 1 0 0
0 0 1 1
0 1 1 1
1 0 1 0
1 1 1 0