Module Operation; D4-430 Special Requirements - Automation Direct DL405 User Manual

Module Operation

D4–430 Special Even though the module can be placed in any slot, it is important to examine the
Requirements configuration if you are using a D4–430 CPU. As you will see in the section on
writing the program, you use V-memory locations to extract the analog data. As
shown in the following diagram, if you place the module so the input 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.
V40401
MSB
X X X
3 3 2
7 0 7
F4–16AD–2 16-Channel Analog Input
F4–16AD–2
8pt 8pt 16pt 16pt
Input Input Input Input
X0 X10 X20 X40
– – – –
X7 X17 X37 X57
V40400 V40402
V40401
MSB
X X X
3 3 2
7 0 7
F4–16AD–2
8pt 16pt 8pt 16pt
Input Input Input Input
X0 X10 X30 X40
– – – –
X7 X27 X37 X57
LSB MSB
X X
2 1
0 7
16pt 16pt
Output Output
LSB
X
2
0
16pt 16pt
Output Output
V40400
LSB
X X X
1 7 0
0
7–9