HONEYWELL 2MLF-AD16A 500µs Conversion Analog Input Module

Brand Honeywell

Model HONEYWELL 2MLF-AD16A 500

The HONEYWELL 2MLF-AD16A is a high-performance 16-channel analog input module engineered for the Honeywell MasterLogic-200 programmable logic controller platform. As a critical component within the MasterLogic-200 I/O architecture, the HONEYWELL 2MLF-AD16A serves as the primary interface between field-mounted analog transmitters and the PLC central processing unit, converting continuous voltage or current signals into precise digital values for process monitoring and control applications. This module represents Honeywell’s commitment to delivering reliable, high-density signal acquisition solutions for demanding industrial automation environments.

Belonging to the MasterLogic-200 series, the HONEYWELL 2MLF-AD16A supports a comprehensive range of input signal types, accommodating both voltage inputs (0–5V, 1–5V, 0–10V, and −10–10V) and current inputs (0–20mA and 4–20mA) through flexible per-channel configuration. The module performs analog-to-digital conversion with 14-bit effective resolution, delivering the measurement precision required for accurate process variable acquisition in temperature, pressure, flow, and level monitoring applications. With a conversion speed of 500 µs per channel, the HONEYWELL 2MLF-AD16A ensures timely data refresh rates suitable for closed-loop control strategies and real-time process supervision.

What distinguishes the HONEYWELL 2MLF-AD16A from conventional analog input modules is its integration of photo-coupler isolation between input terminals and PLC power, protecting sensitive backplane electronics from electrical noise and ground potential differences commonly encountered in industrial environments. The module further incorporates input disconnection detection capability for live-zero signal ranges (1–5V and 4–20mA), enabling the PLC to identify broken transmitter loops or failed field wiring and initiate appropriate alarm responses. Configuration is performed through Honeywell’s graphical I/O parameter setting tools, reducing programming effort and minimizing the potential for configuration errors during commissioning.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	HONEYWELL 2MLF-AD16A
Manufacturer	Honeywell
Product Type	Analog Input Module
Series	MasterLogic-200
Input Channels	16 (voltage/current, per-channel configurable)
Voltage Input Ranges	DC 0–5V, 1–5V, 0–10V, −10–10V
Current Input Ranges	DC 0–20mA, 4–20mA
Voltage Input Resistance	≥1 MΩ
Current Input Resistance	250 Ω
Conversion Resolution	14-bit signed binary data
Conversion Speed	500 µs/channel (typical)
Accuracy	±0.2% F.S. at 25±5°C; ±0.3% F.S. at 0–55°C
Isolation Method	Photo-coupler isolation (input terminals to PLC power)
Internal Power Consumption	DC 5V, 330 mA
Operating Temperature	0°C to 55°C
Weight	Approximately 115 g

Main Features and Advantages

The HONEYWELL 2MLF-AD16A delivers a combination of channel density, conversion accuracy, and diagnostic functionality that addresses the practical requirements of modern industrial process control systems.

Flexible multi-range input capability: The HONEYWELL 2MLF-AD16A supports six distinct input signal types across its 16 channels, with each channel individually configurable for voltage or current operation. This flexibility allows a single module to interface with diverse field instruments—from 4–20mA pressure transmitters to ±10V position sensors—reducing spare part inventory and simplifying panel design. The module handles both live-zero and non-live-zero signal ranges, accommodating legacy and contemporary transmitter specifications within the same hardware platform.

High-speed conversion architecture: With a 500 µs per-channel conversion rate, the HONEYWELL 2MLF-AD16A acquires analog data fast enough to support responsive closed-loop control and transient event capture. The module employs advanced A/D conversion methods including sampling, filtering, and averaging, enabling users to balance speed against noise immunity according to application requirements. This adaptability proves particularly valuable in applications where both steady-state measurement accuracy and dynamic response characteristics are critical.

Integrated diagnostic and protection features: The HONEYWELL 2MLF-AD16A incorporates input disconnection detection for 1–5V and 4–20mA ranges, automatically identifying open-loop conditions and alerting the PLC program for alarm generation or fail-safe action. Photo-coupler isolation between the module’s input stage and backplane power provides 500V AC minimum isolation, safeguarding the PLC from field-side transients and ground loop currents. These built-in protective measures reduce reliance on external signal conditioners and isolation amplifiers, lowering overall system cost and complexity.

User-friendly configuration: The HONEYWELL 2MLF-AD16A is configured through Honeywell’s programming software using a graphical interface, eliminating the need for command-based parameter entry. This approach reduces the volume of sequential logic code required for module initialization and minimizes configuration errors during system integration.