AutomationDirect DL205, Manual

Page: 111 / 359

DL205 Analog Manual, 7th Edition Rev. D
5-17
Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input
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A
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Reading Values (Multiplexing) for the DL230, DL240, DL250-1 and DL260
The DL230 CPU does not have the special V-memory locations which will allow data transfer
to be automatically enabled. Since all channels are multiplexed into a single data word, the
control program must be setup to determine which channel is being read. Since the module
appears as X input points to the CPU, it is very easy to use the active channel status bits to
determine which channel is being monitored.
NOTE: This example is for a module installed as shown in the previous examples. The addresses used would be different
if the module is installed in a different I/O arrangement. The rungs can be placed anywhere in the program, or if stage
programming is being used, place them in a stage that is always active.
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It is usually easier to perform math operations in
BCD, so it is best to convert the data to BCD
immediately. You can leave out this instruction if
your application does not require it.
This instruction masks the channel identification
bits. Without this, the values used will not be
correct so do not forget to include it.
Loads the complete data word into the
accumulator. The V-memory location depends on
the I/O configuration. See Appendix A for the
memory map.
LD
V40401
ANDD
KFFF
BCD
SP1
X34 X35 X36
Store Channel 1
OUT
V2000
When X34, X35 and X36 are off, channel 1 data
is stored in V2000.
X34 X35 X36
Store Channel 2
OUT
V2001
X34 X35 X36
Store Channel 7
OUT
V2006
X34 X35 X36
Store Channel 8
OUT
V2007
When X34 is on, X35 and X36 are off, and
broken transmitter detect is off, channel 2 data
is stored in V2001.
When X35 and X36 are on and X34 is off,
channel 7 data is stored in V2006.
When X34, X35 and X36 are on, channel 8 data
is stored in V2007.
(repeat for channels 3 -- 6)