F
3--
04
D
A
S
4
C
h.
Is
ola
te
d
A
na
lo
g
O
ut.
8--11
F3--04DAS 4-Channel Isolated Analog Output
You may recall the F3--04DAS module appears to the CPU as a 16-point module.
These 16 points provide:
S
the digital representation of the analog signal.
S
identification of the channel to receive the data.
Since all I/O points are automatically mapped into Register (R) memory, it is very
easy to determine the location of the data word that will be assigned to the module.
1
1
0
F3--04DAS
R 011
MSB
LSB
R 001
MSB
LSB
0
1
0
R 002, R012
R 000, R010
1
1
7
8pt
Relay
8pt
Output
16pt
Input
16pt
(Analog)
4ch.
Input
8pt
Output
050
--
057
040
--
047
030
--
037
020
027
--
120
127
000
007
--
100
107
010
017
--
110
117
0
1
7
Within these two word locations, the individual bits represent specific information
about the analog signal.
The last four points of the upper register
are used as outputs to tell the module
which channel to update. In our example,
when output 114 is on, channel 1 will be
updated. Here’s how the outputs are
assigned.
Output
Channels
114
1
115
2
116
3
117
4
R011
MSB
LSB
1
1
0
1
1
7
1
1
6
1
1
5
1
1
4
1
1
3
1
1
2
1
1
1
-- channel selection inputs
Understanding the
I/O Assignments
Channel Selection
Inputs