Honeywell 2MLF-AD16A 16-Channel Analog Input Module

Product Overview

The Honeywell 2MLF-AD16A is a 16-channel analog input module for the MasterLogic-200 (ML200) PLC system. It accepts both voltage (1–5V, 0–10V) and current (4–20 mA, 0–20 mA) signals, providing ultra-high-density analog signal acquisition in a single slot. With 12-bit resolution and 500 μs per channel conversion speed, it is the ideal choice for large-scale process monitoring where channel count is critical and cabinet space is limited.

Key Specifications

• Product Type: 16-Channel Analog Input Module
• Series: MasterLogic-200 / ML200
• Input Channels: 16
• Input Type: Voltage / Current (selectable per channel)
• Voltage Ranges: DC 1–5V, 0–10V
• Current Ranges: DC 4–20 mA, 0–20 mA
• Resolution: 12-bit
• Accuracy: ±0.3% (0–55°C)
• Conversion Speed: 500 μs per channel
• Absolute Max Input: ±15V
• Input Impedance: Voltage ≥ 2 MΩ; Current ≤ 250 Ω
• Isolation: Photo-coupler isolation (input group to logic)
• Terminal Block: 32-point connector
• I/O Addressing: Fixed 64 points; variable 16 points
• Current Consumption: 60 mA (from 5V internal bus)
• External Power: DC 24V (20.4–28.8V)
• Dimensions (W x H x D): 27.4 mm x 90 mm x 70 mm
• Weight: Approx. 115 g (0.115 kg)
• Operating Temperature: 0°C to +55°C

Features & Benefits

• 16-channel ultra-high density — twice the channel count of the AD8A in the same 27.4 mm slot, reducing module count by 50% in large analog systems
• Universal voltage/current input — each channel independently selectable, accommodating mixed sensor types without module swaps
• 32-point connector — high-density terminal block supports 16 channels in a compact footprint, compatible with Honeywell pre-wired cables
• Photo-coupler isolation — protects CPU and backplane from field-side voltage transients and ground loops
• Fast 500 μs conversion — 8 ms total scan for all 16 channels meets the requirements of most process control loops

Typical Applications

• Large-scale temperature monitoring in HVAC central plants
• Multi-tank level measurement in chemical storage facilities
• Building automation sensor aggregation (pressure, humidity, CO2)
• Water treatment multi-parameter monitoring
• Power plant auxiliary system analog input consolidation
• Any application requiring >8 analog inputs per slot

Installation Guide

1. Verify sensor types — confirm voltage or current output for each of the 16 sensors.
2. Install in I/O slot — mount the 2MLF-AD16A in any available ML200 I/O slot.
3. Connect 24V external power — wire DC 24V to the external power terminals.
4. Wire 32-point connector — use the Honeywell 32-point connector or terminal block adapter to wire all 16 channels.
5. Configure per channel — in SoftMaster, set each channel to voltage or current mode and select range.
6. Verify readings — apply known signals and confirm register values match within ±0.3%.

FAQ

Q: What is the difference between 2MLF-AD16A and 2MLF-AD8A?
A: The 2MLF-AD16A has 16 channels with 12-bit resolution. The 2MLF-AD8A has 8 channels with 14-bit resolution. Choose AD16A for maximum channel density; choose AD8A for higher resolution (14-bit) on fewer channels.

Q: What is the difference between 2MLF-AD16A and 2MLF-AD16A-CC?
A: The -CC suffix indicates conformal coating for harsh environments. Electrical specifications are identical. Choose -CC for marine, chemical, or high-humidity applications.

Q: Does this module provide loop power?
A: No. External 24V DC loop power must be provided for 2-wire 4–20 mA transmitters.

Selection Tips

• Choose 2MLF-AD16A for maximum analog input density (16 channels/slot) in standard industrial environments.
• For higher resolution (14-bit) on 8 channels, select 2MLF-AD8A.
• For harsh environments, specify 2MLF-AD16A-CC with conformal coating.
• Always verify your total analog channel count — at 16 channels per module, you can achieve 192 analog inputs in a 12-slot base.