Rockwell Automation 1794-IRT8XT FLEX I/O Thermocouple/RTD /Millivolt Input Module User Manual - Manual (Page 37)

Publication 1794-6.5.12 - September 2011
Configure Your FLEX I/O Module with RSLogix 5000 Software 25
7. After you have completed all the Module Configuration parameters,
click OK in the Module Properties dialog box.
Sensor Mode Allows you to select the operational mode for the
thermocouple or RTD inputs. For thermocouple inputs,
you can choose the cold junction compensation mode.
For RTD inputs, you can choose 2-wire, 2-wire with
user selected RTD offset, 3-wire, and 4-wire.
Default for thermocouples is external compensation;
default for RTDs is 2-wire (with no offsets).
For Thermocouple
External compensation
Internal compensation
No compensation
Differential compensation
For a description of the
different sensor mode
options, for both
Thermocouple and RTD,
see Bit/Word
Descriptions for Block
Transfer Write Words,
on page 34.
For RTD
2-wire compensation (default)
2-wire with Loop compensation
3-wire
4-wire
When you select
Internal Compensation
for your Thermocouple,
you need to specify a
corresponding
Reference Junction
value. This parameter
sets a fixed reference
junction to compensate
all thermocouple
channels and ranges
from 0 °C…70 °C.
When you select 2-wire
with Loop compensation
for your RTD, you need
to specify values for
each channel for the
RTD Loop
Compensation.
Input Filter Cutoff Allows you to select one of eight levels on input
filtering. The single pole, low pass filtering is
accomplished by the module microprocessor. The filter
selections range from Hardware Only to 5 s time
constant. The times are approximate because they are
based on the module scan time, which varies. The
default is Hardware Only.
Hardware Filter Only (default)
25 ms
100 ms
250 ms
500 ms
1 s
2 s
5 s
Data Format Allows you to specify the format of the data reported.
Module defaults to -4000…10000 in millivolt mode,
and 0…5000 in Ω mode with implied decimal points
(i.e. -40.00mV, 0.1 Ω ) whenever °C, °F, °K is selected.
°C
°F
°K
-32767…32767
0…65535
Configuration Parameters
Field Name Description Configuration Options