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
Содержание 1734-8CFGDLX
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