DL205 Analog Manual, 7th Edition Rev. D
6-18
Chapter 6: F2-04RTD 4-Channel RTD Input
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Reading 2’s Compliment Values (Multiplexing)
The DL230 CPU does not have the special V-memory locations that allows for automatic
enabling the data transfer. Since all channels are multiplexed into a single data word, the
control program must be set up 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. The 2’s complement data format may be
required to correctly display bipolar data on some operator interfaces. This data format could
also be used to simplify averaging a bipolar signal. To view this data format in
Direct
Soft, select
Signed Decimal.
Scaling the Input Data
No scaling of the input temperature is required. The readings directly reflect the actual
temperatures. For example: a reading of 8482 is 848.2
°C
, a reading of 16386 is -0.2
°C
(magnitude plus sign) and a reading of 32770 is -0.2
°
(2’s complement).
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This instruction masks the channel sign bit.
Loads the complete data word into the accumulator.
The V-memory location depends on the I/O
configuration.
Load Data
LD
V40401
ANDD
K7FFF
SP1
X40
X41
X50
Store Channel 1
OUT
V2000
When X40, X41 and X50 are off, channel 1 data is
stored in V2000.
When X40 is on and X41 and X51 are off, channel 2
data is stored in V2001.
When X40 and X52 are off and X41 is on, channel 3
data is stored in V2002.
When both X40 and X41 are on and X53 is off, channel
4 data is stored in V2003.
X40
X41
X51
Store Channel 2
OUT
V2001
X40
X41
X52
Store Channel 3
OUT
V2002
X40
X41
X53
Store Channel 4
OUT
V2003
Summary of Contents for DL205
Page 1: ...DL205 Analog I O Manual Manual Number D2 ANLG M ...
Page 2: ...Notes ...
Page 6: ...Notes ...
