Rockwell Automation 1734-XXXX POINT I/O and ArmorPOINT I/O DeviceLogix User Manual - Manual (Page 71)

Publication 1734-UM015A-EN-E - November 2009
DeviceLogix Capabilities 69
Latch Functions
There are two kinds of Latch functions: Set Dominant Latch (SR) and Reset
Dominant Latch (RS). Unlike the Latch in RSLogix 5000, DeviceLogix Latch
requires the Reset binding. So the Set/Reset appears in pair and the RS type
and SR type have different element order. See its truth table below.
Not OR (BNOR) 0 0 1
0 1 0
1 0 0
1 1 0
Exclusive OR (BXOR) 0 0 0
0 1 1
1 0 1
1 1 0
Exclusive Not OR (BXNOR) 0 0 1
0 1 0
1 0 0
1 1 1
NOT (BNOT)
(1) 0 N/A 1
1 N/A 0
(1) The Input number can be set in a property page; the default number is 2. BNOT has only one input.
Function Block Type Reset Set Value at time +
t
0
Value at time +
t
0+1
SETD (Set Dominant) 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
Function Block Type Input 1 Input 2 Output Value