Allen-Bradley 1746-NR8 SLC 500 8-Channel RTD Input Module By wayne No Comments on Allen-Bradley 1746-NR8 SLC 500 8-Channel RTD Input Module 2 Min Read The Allen-Bradley 1746-NR8 offers eight RTD/resistance channels for your SLC 500 system. It supports platinum, copper, and nickel sensors with sigma-delta conversion.