Output Bit Assignments; Channel Select Bits - Automation Direct DL405 User Manual

19–8
F4–08DA–2 8-Ch. Analog Voltage Output
Output Bit
Assignments
Channel Select
Bits
You may recall the F4–08DA–2 module requires 16 discrete output points from the
CPU. These points provide:
S
The digital representation of one analog signal per scan.
S
Identification of the channel that is to receive the data.
S
Output enable control for all channels.
Since all output points are automatically mapped into V-memory, it is very easy to
determine the location of the data word that will be assigned to the module.
Within this V-memory location the individual bits represent specific information
about the channel selected and the analog signal.
Output bits 12, 13, and 14 of the data word are the channel select outputs. They
are binary encoded to select the channel from 1 to 8 that will be updated with the
data.
Bit Bit Bit
14 13 12
Off Off Off
Off Off On
Off On Off
Off On On
On Off Off
On Off On
On On Off
On On On
F4–08DA–2
8pt 8pt 16pt 16pt
Output Output Output Output
Y0 Y10 Y20 Y40
– – –
Y7 Y17 Y37 Y57
V40500 V40502
V40501
MSB
Bit 15 14 13 12 11 10 9 8 7 6
Y Y Y
3 3 2
7 0 7
Channel
MSB
1
1 1 1
2
5 4 3
3
4
5
6
7
8
16pt 16pt
Input Input
–
LSB
5 4 3 2 1 0
Y
2
0
V40501
LSB
1 1 1 9 8 7 6 5 4 3 2 1
2 1 0

– Channel Select Bits

0