AutomationDirect DL205 Manual

DL205 Analog Manual, 7th Edition Rev. D
6-17
Chapter 6: F2-04RTD 4-Channel RTD Input
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A
B
C
D
Reading Magnitude Plus Sign 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.
NOTE: DL230 CPUs with firmware release version 1.6 or later required for multiplexing ladder.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A
b
C
D
This instructionmasks thesign bit.Without this,
thevaluesusedwillnot be correctsodo not forget
to include it.
Loadsthe complete datawordintothe
accumulator. TheV-memorylocation depends on
theI/O configuration. SeeAppendixAforthe
memory map.
LD
V40401
ANDD
K7FFF
SP1
X40 X41 X50
StoreChannel 1
OUT
V2000
When X40, X41, andX50 areoff,channel 1 datais
stored in V2000. C0 is resettoindicate that
channel1’s value is positive.
SET
C0
X37
RST
C0
If X37ison, the datavalue representsanegative
temperature. C0 is settoindicate that channel1’s
value is negative.
X40 X41 X51
StoreChannel 2
OUT
V2001
When X40isonand X41 and X51are off, channel
2dataisstoredinV2001. C1 is resettoindicate
that channel2’s value is positive.
SET
C1
X37
RST
C1
If X37ison, the datavalue representsanegative
temperature. C1 is settoindicate that channel2’s
value is negative.
X40 X41 X52
OUT
V2002
SET
C2
X37
RST
C2
X40 X41 X53
OUT
V2003
SET
C3
X37
RST
C3
When X40and X52are off and X41is on, channel
3dataisstoredinV2002. C2 is resettoindicate
that channel3’s value is positive.
If X37ison, then the datavalue representsa
negative temperature. C2 is settoindicate that
channel3’s value is negative.
When bothX40 andX41 areonand X53isoff,
channel4data is stored in V2003. C3 is resetto
indicate that channel 4’svalue is positive.
If X37ison, the datavalue representsanegative
temperature. C3 is settoindicate that channel4’s
value is negative.
StoreChannel 3
StoreChannel 4

AutomationDirect DL205 Specifications

General

Brand	AutomationDirect
Model	DL205
Category	Controller
Language	English