Allen-Bradley 1746-NR4 SLC 500 RTD Input Module 4-Channel By wayne No Comments on Allen-Bradley 1746-NR4 SLC 500 RTD Input Module 4-Channel 2 Min Read Buy the Allen-Bradley 1746-NR4 RTD module for your SLC 500 system. It offers four channels for precise temperature measurement with Platinum and Nickel sensors.