Allen-Bradley 1794-IRT8 - Page 53

Publication 1794-6.5.12 - November 1997
5-10 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Write Word 2
cont.
Bits 14-15
(16-17)
Input Type Select
Bit 15 14 Input type selection for channels 4-7
0 0 Thermocouple
01RTD
1 0 Not used
11
Write Word 3 00-15 (00-17) RTD loop resistance offset select bits – used input type is set to RTD and sensor mode select is
set to 2-wire with loop resistance compensation. Allows you to set the type of RTD loop resistance
compensation used for all RTDs or one of three fixed values for all channels. NOTE: Not applicable
to 10Ω copper RTD, which defaults to 0Ω.
Bit 01 00 RTD channel 0
Bit 03 02 RTD channel 1
Bit 05 04 RTD channel 2
Bit 07 06 RTD channel 3
Bit 09 08 RTD channel 4
Bit 11 10 RTD channel 5
Bit 13 12 RTD channel 6
Bit 15 14 RTD channel 7
0 0 Use channel loop compensation value stored during calibration procedure
for 2-wire RTD (default = 0Ω)
015Ω
1010Ω
1115Ω
Write Word 4 00-07 Extended data table command data bits – These bits are written to the module during
calibration. They are used to define offset, gain and general channel calibration.
08-14 (10-16) Extended data table command bits – These bits are written to the module during calibration.
They are used to select channel calibration action.
15 (17) Reserved for factory use only.
Word
Dec. Bits
(Octal Bits)
Description
Allen-Bradley PLCs