Allen-Bradley 1794-IRT8 - Page 49

Publication 1794-6.5.12 - November 1997
5-6 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Word
Dec. Bits
(Octal Bits)
Description
Write Word 1 Bits 00-02 Input Filter Cutoff bits
Bit020100Definition
0 0 0 Hardware filtering only (default filtering)
0 0 1 40Hz
0 1 0 10Hz
0114Hz
1002Hz
1011Hz
1 1 0 0.5Hz
1 1 1 0.2Hz
Bits 03-05 Reference Junction – used when input type is set to thermocouple and sensor mode is set to
internal compensation. Sets a fixed reference junction to compensate all thermocouple channels.
Bit050403Reference Junction
0000°C
0 0 1 20°C
0 1 0 25°C
0 1 1 30°C
1 0 0 40°C
1 0 1 50°C
1 1 0 60°C
1 1 1 70°C
Bits 06-07 Fault Mode bits – when a bit is set (1), fault mode is enabled for that channel. Bit 06 corresponds
to channels 0-3; bit 07 corresponds to channels 4-7.
0 = disabled
1 = enable wire-off detection
Bits 08-11
(10-13)
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
0000°C
0001°F
0010°K
0 0 1 1 –32767 to +32767
0 1 0 0 0 to 65535
0101 through 1111 not used
Bits 12-15
(14-17)
Not used
Allen-Bradley PLCs