DL205 Analog Manual, 7th Edition Rev. D
7-17
Chapter 7: F2-04THM, 4-Channel Thermocouple Input
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B
C
D
Negative Temperatures 2’s Complement for the DL240, DL250-1 and DL260 CPUs
(Binary/Pointer Method)
The 2’s complement mode used for negative temperature display purposes, while at the same time
using the magnitude plus sign of the temperature in a control program. The
Direct
Soft element
Signed Decimal is used to display negative numbers in 2’s complement form. To find the absolute
value of a negative number in 2’s complement, invert the number and add 1 as shown in the
following example:
Understanding the Input Assignments (Multiplexing Ladder Only)
Remember that the F2-04THM module appears as a 32-point discrete input module to the
CPU. Use these points to obtain:
•
An indication of which channel is active
•
The digital representation of the analog signal
•
Module diagnostic information
Since all input points are automatically mapped into V-memory, it is easy to determine the
location of the data word that will be assigned to the module.
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b
C
D
LD
V2000
OUT
V2010
ADDB
K1
V2000
K8000
²
INV
Load negative value into the accumulator so we
can convert it to a positive value.
Invert the binary pattern in the accumulator.
Add 1.
Save Channel 1 data at V2010.
Repeat for other channels as required.
F2-04THM
V40400
V40403
8pt
Input
8pt
Input
16pt
Input
Output
16pt
32pt
Input
X0
--
X7
X10
--
X17
X20
--
X57
X60
--
X77
Y0
--
Y17
Slot 0
Slot 1
Slot 2
Slot 3
Slot 4
X
3
7
V40401
B
S
L
B
S
M
X
2
0
X
2
7
X
3
0
X
5
7
V40402
B
S
L
B
S
M
X
4
0
X
4
7
X
5
0
0
1
3
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14
2
5
1
Bit
0
1
3
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5
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2
5
1
Bit
Содержание DL205
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Страница 2: ...Notes ...
Страница 6: ...Notes ...