User manual

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
010
100
110
Exclusive OR (BXOR) 0 0 0
011
101
110
Exclusive Not OR (BXNOR) 0 0 1
010
100
111
NOT (BNOT)
(1)
0N/A1
1N/A0
(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
010 1
100 0
110 1
001 1
011 1
101 0
111 1
Function Block Type Input 1 Input 2 Output Value