Rockwell Automation 1797-IRT8 FLEX Ex Thermocouple/RTD/mV Input Module User Manual - Manual (Page 18)

Publication 1797-6.5.2 - February 2001
2-4 Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features
Choose the best input filter cutoff in your programming software.
Data Format
You must choose a module data format in your user program. Select
the format by setting bits as shown below. Note that this parameter
affects channel accuracy.
o
C,
o
F and
o
K will have formats appropriate to the selected
thermocouple or RTD range (e.g. -xxxx to +xxxx with 1 decimal place
implied - 3500 = 350.0). For Cu10 RTD, 2 decimal points are implied.
If using mV, data format defaults to -4000 to +10000 (2 decimal points
implied (e.g. -40 to 100.00). If using W mode selection, data format
defaults to 0 to 5000 (1 decimal point implied, e.g. 0.- to 500.0).
In the thermocouple and RTD modes, if unused data formats are
chosen, the module will default to
o
C.
Input Filter Cutoff bits
Bit 02 01 00 Definition
0 0 0 Hardware filtering only (default filtering) 600Hz (1.7ms)
0 0 1 40Hz (25ms)
0 1 0 10Hz (100ms)
0 1 1 4Hz (250ms)
1 0 0 2Hz (500ms)
1 0 1 1Hz (1s)
1 1 0 0.5Hz (2s)
1 1 1 0.2Hz (5s)
Data format – module defaults to –4000 to 10000 in millivolt mode, and 0 to 5000 in ohms mode
Bit 11 10 09 08 Data type for channels 0-7
0 0 0 0 °C
0 0 0 1 °F
0 0 1 0 ×K
0 0 1 1 –32767 to +32767
0 1 0 0 0 to 65535
0101 through 1111 not used