DL205 Analog Manual, 7th Edition Rev. D
10-7
Chapter 10: F2-08DA-1, 8-Channel Analog Current Output
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Module Operation
Before beginning to write the control program, it is important to take a few minutes to under-
stand how the module processes the analog signals.
Channel Scanning Sequence for a DL230 CPU (Multiplexing)
The DL230 can send one channel of data to the output per CPU scan if the multiplexing
method is used. The module refreshes all field devices on each scan, but new data can only be
obtained from the CPU at the rate of one channel per scan. Since there are eight channels, it
can take eight scans to update all channels. However, if only one channel is being used, then
that channel will be updated on every scan. The multiplexing method can also be used for the
DL240, DL250-1, and DL260 CPUs.
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Channel 1
Channel 2
Channel 3
Channel 4
Channel 8
Scan N
Calculatethe data
Writedata
Read inputs
ExecuteApplic ationProgram
Scan N+1
Scan N+2
Scan N+3
Scan N+8
Scan
Writeto outputs
System Using
Multiplex
Method
(DL230)
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