Honeywell 2MLI-A12A Digital Input Module
Product Overview
The Honeywell 2MLI-A12A is a 12-channel digital input module designed for high-performance operation in Honeywell’s ML200 series control systems. This module is engineered to collect and process digital signals from field devices such as switches, sensors, and relay contacts. It is commonly used in safety and process automation environments where reliable signal acquisition and integrity are essential.
The 2MLI-A12A module features built-in diagnostic capabilities, high input isolation, and rugged design suitable for demanding industrial applications. With compatibility for a wide range of field voltages and seamless integration into Honeywell control architectures, it supports accurate and timely digital signal monitoring in critical operations.
Key Features
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12 Discrete Input Channels – Efficiently collects digital signals from field equipment for processing and control
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24 VDC Input Compatibility – Standard industrial voltage level support for easy integration
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High Noise Immunity – Designed to perform reliably in electrically noisy environments
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Status Indication LEDs – Channel-wise LEDs provide instant feedback for input status and troubleshooting
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Channel Isolation – Ensures safe and independent operation of each input channel
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DIN-Rail Mounting – Simplifies installation in control panels and enclosures
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Compatible with ML200 System – Full support for integration with Honeywell safety and process controllers
Technical Specifications
3.1 Dimensions and Weight
| Item | Specification |
|---|---|
| Dimensions | 120 x 110 x 25 mm |
| Weight | 0.13 kg |
3.2 Electrical Characteristics
| Item | Specification |
|---|---|
| Input Channels | 12 digital inputs |
| Input Voltage Range | 18 VDC to 30 VDC |
| Logic ‘1’ Threshold | ≥ 15 VDC |
| Logic ‘0’ Threshold | ≤ 5 VDC |
| Input Impedance | Approx. 3 kΩ |
| Isolation | Channel-to-system: >1500 VDC |
3.3 Environmental Characteristics
| Item | Specification |
|---|---|
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5% to 95% RH (non-condensing) |
| Shock/Vibration | IEC 60068 compliant |
| Protection Class | IP20 |
3.4 System Compatibility
| Item | Specification |
|---|---|
| System | Honeywell ML200 series |
| Communication | Integrated via system backplane |
| Configuration Tools | Honeywell system engineering environment |
Industry Applications
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Industrial Safety Systems – Reliable monitoring of interlocks, emergency stop buttons, and critical contact signals
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Power Generation – Captures digital status from breakers, relays, and status sensors in turbine and substation systems
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Chemical & Petrochemical – Interfaces with process control switches and alarms in hazardous environments
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Water Treatment – Tracks pump statuses, level switch signals, and valve feedback in distributed systems
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Manufacturing Automation – Supports sensor feedback and limit switch monitoring in production lines and machinery
The Honeywell 2MLI-A12A Digital Input Module delivers dependable performance for digital signal acquisition in a broad range of automation and safety-critical applications. With 12 isolated channels, robust electrical design, and easy integration into ML200 control systems, it provides a cost-effective and reliable solution for modern industrial environments.
