Product Overview

• Part No: AB121
• Brand: ALSTOM

• Category: Binary Input/Output ModuleAB121 is a standard Eurocard rack-mounted digital I/O module for ALSTOM SIRE turbine control platform. It collects field binary status signals and outputs switching control commands. The module builds signal connection between the main control board and on-site switches, valves and auxiliary equipment, executing interlock logic, status feedback and sequence control. It is a key spare component for overhaul and retrofitting of thermal power plant steam turbine control systems.

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Core Features

• Multi-channel digital input and output for switching signal acquisition and logic control
• Built-in signal isolation and filtering, strong anti-interference performance for power plant cabinets
• Front panel LED indicators for channel status, convenient for on-site fault inspection
• Standard pull-out Eurocard design, supporting quick replacement inside the subrack
• Optional conformal coating, suitable for humid industrial operating environments

• Passed thermal cycling, vibration and EMC reliability testing for long-term continuous operation

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Technical Specifications

• Supply Voltage: 24VDC
• Operating Temperature: -20°C ~ +60°C
• Storage Temperature: -40°C ~ +85°C
• Installation: Standard subrack slot mounting inside turbine control cabinet

• Protection Class: IP20

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Compatibility & Application

• Compatible with ALSTOM SIRE turbine control rack, matched with AH116-2 main control board, AS111-1 analog output module
• Widely used in thermal power plant turbine control cabinet maintenance and renovation
• Applied for valve position feedback, auxiliary equipment interlock, protection trip signal collection and switching control