Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 114)

Publication 1746-UM008B-EN-P - December 2006
114 Application Examples
Program Setup and Operation Summary
1. Set up two configuration words in memory for each channel,
one for °C and the other for °F.
2. When the position of the degrees selector switch changes, write
the appropriate channel configuration to the RTD module.
Note that the use of the OSR instruction (one-shot rising) makes
these configuration changes edge-triggered, that is, the RTD unit
is reconfigured only when the selector switch changes position.
3. Convert the individual RTD data words to BCD and send the
data to the respective LED displays.
Channel Configuration Word Allocation
°F °C
0 N10:0 N10:4
1 N10:1 N10:5
2 N10:2 N10:6
3 N10:3 N10:7
°C °F
Degrees Selector Switch