Yokogawa ALR121-S51 S1 CENTUM VP Serial Communication Module Industrial Proximity Detector Item Specification Model AMM25C Reference

Item Specification Model AMM25C Reference Junction Compensation Built-in (dedicated RJC input) Terminal Interface S1 terminal block with M4 screw terminals System Interface KS1 interface cable System Compatibility CENTUM CS

With a modular architecture and fault-tolerant capabilities

40 kΩ (TMR)

Parameter Value Model Number P0973CND Module Type Termination Assembly Module Operating Temperature -40°C to +85°C Dimensions (WxDxH) 6 × 18 × 20 cm Weight 0

their protection features and robust design make them suitable for harsh industrial environments with high electrical noise or temperature fluctuations

Yokogawa ALR121-S51 S1 CENTUM VP Serial Communication Module Industrial Proximity Detector Item Specification Model AMM25C ReferenceProduct Description The ALR121 S51 S1 is a high reliability serial communication interface module designed for integration with Yokogawa CENTUM VP and Yokogawa CENTUM CS 3000 Distributed Control Systems (DCS). It acts as a communication bridge between the Field Control Station (FCS) and external industrial devices such as PLC networks, power monitoring systems, and motor controllers. The module supports both RS 422 and RS 485 physical layers, enabling