Output Bit Assignments - Automation Direct DL405 User Manual

13–8
F4–04DA–1 Analog Current Output
Output Bit
Assignments
Channel Select
Bits
You may recall the F4–04DA–1 requires 16 discrete output points from the CPU.
These points provide:
S
The digital representation of the analog signal.
S
Identification of the channel that is to receive the data.
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 and 13 are the channel
select outputs. They are binary encoded
to select the channel that will be updated
with the data. The bits are assigned as
follows.
Bit Bit
13 12 Channel
Off Off
Off On
On Off
On On
F4–04DA–1
8pt 8pt 16pt
Output Output Output
Y0 Y10 Y20
– – –
Y7 Y17 Y37
V40500
V40501
MSB
Bit 15 14 13 12 11 10 9 8
Y Y
3 3
7 0
MSB
1 1
5 4
1
2
3
4
16pt 16pt 16pt
Output Input Input
Y40
–
Y57
V40502
LSB
7 6 5 4 3 2 1 0
Y Y
2 2
7 0
V40501
1 1 1 1 9 8 7 6 5 4 3 2 1
3 2 1 0
– Channel Select Bits
LSB
0