DL205 Analog Manual, 7th Edition Rev. D
7-7
Chapter 7: F2-04THM, 4-Channel Thermocouple Input
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B
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Selecting the Conversion Units
Use the last two jumpers, Units-0 and Units-1, to set the conversion unit used for either
thermocouple or voltage inputs. The options are magnitude plus sign or 2’s complement, plus
Fahrenheit or Celsius for thermocouples. See the next two sections for jumper settings when
using either thermocouple or voltage inputs.
Thermocouple Conversion Units
All thermocouple types are converted into a direct temperature reading in either Fahrenheit or
Celsius. The data contains one implied decimal place. For example, a value in V-memory of
1002 would be 100.2
°F
or
°C
.
For thermocouple ranges which include negative temperatures (J,E,K,T,N), the display
resolution is from -3276.7 – +3276.7. For positive-only thermocouple ranges (R,S,B,C), the
display resolution is 0 – 6553.5.
Negative temperatures can be represented in either 2’s complement or magnitude plus sign
form. If the temperature is negative, the most significant bit in the V-memory location is set
(X17).
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.
For unipolar thermocouple ranges (R,S,B,C), it does not matter if magnitude plus sign or 2’s
complement is selected.
Use the table to select settings. The module comes with both jumpers installed for magnitude
plus sign conversion in Fahrenheit. For example, remove the Units-0 jumper and leave the
Units-1 jumper installed for magnitude plus sign conversion in Celsius.
X = Jumper installed, and
blank space = jumper removed.
Voltage Conversion Units
The bipolar voltage input ranges, 5V or 156mV (see previous page for 5V and 156mV settings),
may be converted to a 15-bit magnitude plus sign or a 16-bit 2’s complement value.
Use the table to select settings. The module comes with both jumpers installed for magnitude
plus sign conversion. Remove the Units-1 jumper and leave the Units-0 jumper installed for
2’s complement conversion.
X = Jumper installed, and
blank space = jumper removed.
NOTE:
When selecting a Unipolar Voltage mod (0-5V, 0-156mV), BCD data type will not give a correct reading. Decimal
data type should always e used for Unipolar Voltage modes.
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b
C
D
Number
of
Channels
Temperature Conversion Units
Mag Sign
°F °C
2’s Compliment
°F °C
Units-0
X
–
X
–
Units-1
X
X
–
–
Jumper
Pins
Voltage Conversion Units
Magnitude
Plus Sign
2’s
Compliment
Units-0
X
X
Units-1
X
–
Содержание DL205
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