Writing The Control Program; Multiple Channels Selected - Automation Direct DL405 User Manual

Writing the Control Program

If you have configured the F4–08AD module, use the following examples to get
started writing the control program.
Multiple Since all channels are multiplexed into a single data word, the control program must
Channels be set up to determine which channel is being read. Since the module appears as X
Selected input points to the CPU, it is very easy to use the active channel status bits to
determine which channel is being monitored.
F4–08AD 8-Channel Analog Input
F4-08AD
8pt 8pt
Input Input
X0 X10
– –
X7 X17
V40400
V40401
MSB
Active
Unusable
Channel Bits
Bit
16pt 16pt 16pt 16pt
Input Input Output Output
X20 X40
– –
X37 X57
V40402
LSB
Data Bits
5–13