DL205 Analog Manual, 7th Edition Rev. D
3-10
Chapter 3: F2-04AD-2 , F2-04AD-2L, 4-Channel Analog Voltage Input
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Module Operation
Channel Scanning Sequence for a DL230 CPU (Multiplexing)
Before beginning to write the control program, it is important to take a few minutes to
understand how the module processes and represents the analog signals.
Depending on the type of CPU being used, the module can supply different amounts of data
per scan. The DL230 can obtain one channel of data per CPU scan. Since there are four
channels, it can take up to four scans to get data for all channels. Once all channels have been
scanned the process starts over with channel 1. Unused channels are not processed, so if only
two channels are selected, then each channel will be updated every other scan. The multiplexing
method can also be used for the DL240/250-1 and DL260 CPUs.
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Channel1
Scan N
Read thedata
Storedata
Read Inputs
ExecuteApplication Program
Channel2
Scan N+1
Channel3
Scan N+2
Channel4
Scan N+3
Channel1
Scan N+4
Scan
WritetoOutputs
System With
DL230CPU
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