Yokogawa AAR181-S50 S2 Analog Input Module

The Yokogawa AAR181-S50 S2 is a rack-mounted analog input module for CENTUM VP DCS systems. It receives 4-20mA analog signals from field transmitters, converts analog values into digital data and transmits processed information to the controller for closed-loop process regulation.

This isolated analog input board supports multi-channel signal acquisition and channel self-diagnosis function. It is widely stocked as spare parts for maintenance and upgrading of CENTUM VP control cabinets in petrochemical, power and pharmaceutical industries.

Main Specifications

• Brand: Yokogawa; Model: AAR181-S50 S2; Type: Analog Input Module
• Applicable System: Yokogawa CENTUM VP Distributed Control System
• Core Tasks: Analog signal acquisition, A/D conversion, signal isolation, channel fault diagnosis
• Signal Interface: Field analog wiring terminals, CENTUM VP rack backplane connector
• Installation: Plug-in slot mounting on standard CENTUM VP chassis rack
• Input Signal: 4~20mA analog signal, with channel isolation
• Operating Environment: 0℃ ~ +60℃, 5%‑95% RH non‑condensing, industrial anti‑vibration grade
• Certifications: CE, complies with industrial DCS EMC and safety standards

Core Functions

• Collect analog current signals from pressure, temperature and flow transmitters and complete high-precision analog-to-digital conversion.
• Adopt independent channel isolation design to suppress on-site electromagnetic interference and improve signal stability in complex industrial environments.
• Built-in channel self-diagnosis detects open circuit, short circuit and module hardware faults, and uploads alarm information to DCS operation station.
• Transmit converted digital process data to DCS controller through chassis backplane bus for PID calculation and process control.
• Chassis plug-in structure supports convenient disassembly and replacement, reducing maintenance time during on-site cabinet overhaul.
• Conformal coated circuit board enhances dust-proof and moisture-proof performance, adapting to long-term stable operation in control rooms.

Application Scenarios

• Spare-part replacement for Yokogawa CENTUM VP DCS control cabinets in petrochemical, power, pharmaceutical and water treatment sites.
• Analog signal acquisition hardware for temperature, pressure, flow and liquid level process monitoring loops.
• Maintenance backup inventory for renovation and after-sales maintenance projects of legacy Yokogawa DCS equipment.
• Matching analog I/O module cooperating with CENTUM VP power supply, CPU and digital input/output modules.
• Retrofit replacement for aged modules with channel signal loss, data deviation and self-diagnosis alarm faults.

• Global aftermarket spare supply for automation maintenance teams maintaining Yokogawa DCS equipment worldwide.