D4-430 Special Requirements - Automation Direct DL405 User Manual

19–6
F4–08DA–2 8-Ch. Analog Voltage Output
Module Operation
D4–430 Special
Requirements
Even though the module can be placed in any slot, it is important to examine the
configuration if you are using a D4–430 CPU. As you'll see in the section on writing
the program, you use V-memory locations to send the analog data. As shown in the
following diagram, if you place the module so the output points do not start on a
V-memory boundary, the instructions cannot access the data.
Correct!
Wrong!
Data is split over two locations, so instructions cannot access data from a D4–430.
V40501
MSB
Y Y Y
3 3 2
7 0 7
F4–08DA–2
8pt 8pt 16pt 16pt
Output Output Output Output
Y0 Y10 Y20 Y40
– – – –
Y7 Y17 Y37 Y57
V40500 V40502
V40501
MSB
Y Y Y
3 3 2
7 0 7
F4–08DA–2
8pt 16pt 8pt 16pt
Output Output Output Output
Y0 Y10 Y30 Y40
– – – –
Y7 Y27 Y37 Y57
V40500
LSB MSB
Y Y
2 1
0 7
16pt 16pt
Input Input
LSB
Y
2
0
16pt 16pt
Input Input
LSB
Y Y Y
1 7 0
0