Allen-Bradley 931S-C2R1D-DC2R Programmable Logic Controller Module

Allen-Bradley 931S-C2R1D-DC2R is an isolated limit-value monitoring signal conditioner with one input and two change-over relay outputs. It accepts 0-10 V, 0-20 mA, or 4-20 mA inputs, is powered from 24 V DC (±25%), and typically consumes about 1 W. Each channel offers adjustable switching thresholds (1–90%) with 1–10% hysteresis, a maximum switching voltage of 253 V AC, and a 3 A continuous current rating for the relays. LED indicators show OK or alarm per channel, the unit uses AgNi 90/10 change-over contacts, and Rockwell lists this model as discontinued (October 9, 2019) with 931S-U382 as its functional replacement.