Rockwell Automation T3431-CA ICS Regent Thermo Couple Input Assembly - Manual (Page 13)

Thermocouple Input Assembly (T3431)
P D - 6 0 2 4 M a r - 0 6
13
Note: There are four unused codes. Using any of these codes
will cause a Mux fault indication.
Thermocouple Noise Filtering
Thermocouples and their associated wiring may be installed
in electrically noisy environments. Noise filtering is required
to ensure that this noise does not affect the reading of the low
level thermocouple signals. Three jumper posts are located on
the Mux to select between 50 Hz or 60 Hz digital filtering.
Choose the frequency which represents the predominant
source of electrical noise in the thermocouple environment
(e.g. electrical motors). This configuration selection applies to
all 24 thermocouple inputs. Position the jumper on the upper
two posts to select 50 Hz filtering. Position the jumper on the
lower two posts to select 60 Hz filtering.
Thermocouple Data Format
The thermocouple input module provides linearized
temperature data to the processors in degrees Fahrenheit or
Celsius. Three jumper posts are located on the Mux to select
between degrees C or F. Position the jumper on the upper two
posts to select degrees C. Position the jumper on the two lower
posts to select degrees F.
The temperature data resolution must also be configured for
units (data increments of 1 degree), or tenths (data increments
of 0.1 degree). Position the jumper on the upper two posts to
select units. Position the jumper on the two lower posts to
select tenths.
Note: the thermocouple data is always presented as integer
data to the processor modules. When you select tenths
resolution, there is an implied fixed place decimal before the
least significant digit in the temperature data. For example
the temperature data value 1527 would represent 152.7º.
The ranges of temperature data for each type of thermocouple
are shown in Table 2. The thermocouple data format
selections apply to all 24 thermocouple inputs.
Table 2. Temperature Data Ranges
Maximum
Range Limits
Resolution: 1º Resolution: 0.1º