Setting Input Type - Automation Direct DL405 User Manual

10–6
F4-08THM 8-Channel Thermocouple Input

Setting Input Type

Selecting the
Conversion Units
Thermocouple
Conversion Units
The next four jumpers (Tc Type 0, Tc Type 1, Tc Type 2, Tc Type 3) must be set to
match the type of thermocouple being used or the input voltage level. The module
can be used with many types of thermocouples. Use the table to determine your
settings.
The module comes from the factory with all four jumpers installed for use with a J
type thermocouple. For example, to use an S type thermocouple, remove the
jumper labeled Tc Type 2.
thermocouple type or voltage range.
X = Jumper installed, and blank space = jumper removed.
Thermocouple /
Voltage Inputs
Tc Type 0
J X
K
E X
R
S X
T
B X
N
C X
0–5V.
5V.
X
0–156mV.
156mV.
X
Use the last two jumpers, Units-0 and Units-1, to set the conversion unit used for
either thermocouples 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 thermocouples or if using voltage inputs.
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_C or _F.
For thermocouple ranges which include negative temperatures (J,E,K,T,N), the
display resolution is from –3276.7 to +3276.7. For positive-only thermocouple
ranges (R,S,B,C), the display resolution is 0 to 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 DirectSoft, select Signed
Decimal.
All channels of the module must be the same
Jumper
Tc Type 1 Tc Type 2
X X
X X
X
X
X
X
X X
X X
X
X
X
Tc Type 3
X
X
X
X
X
X
X
X