Allen-Bradley 931S-P491 Signal Conditioning Module

Allen-Bradley 931S-P491 Programmable Signal Converter from Rockwell Automation is a single-channel signal conditioning module that translates a wide input range into a controller-friendly output. It accepts inputs from ±20 mV to ±200 V (P) and delivers either a voltage output (0 to ±10 V) or a current output (0 to 20 mA) (A), allowing direct interfacing with common PLC analog inputs and instrumentation. The unit is powered from 24–230 V AC or DC, enabling flexible installation in diverse control panels. An on-board interactive display provides on-site configuration and calibration, helping engineers tailor the channel to sensor characteristics without external software. As part of the 931S family, the P491 is designed to improve signal quality from field devices to a control system, serving applications that require signal conditioning, translation, and reliable data for PLCs and other industrial controllers. This compact, single-channel module is suited for conditioning a range of sensors and signals prior to digital processing, making it a practical choice when you need a precise, configurable signal interface within an Allen-Bradley ecosystem.