Honeywell 2MLF-AC8A 8-Channel Analog Input Module

Product Overview

The Honeywell 2MLF-AC8A is an 8-channel analog input module engineered for the MasterLogic-200 (ML200) PLC platform. It delivers high-precision current signal acquisition for process control, water treatment, power generation, and factory automation. With 16-bit resolution and 250 μs per-channel conversion speed, the 2MLF-AC8A ensures real-time data integrity for mission-critical control loops.

Key Features

• 8 independent analog input channels for simultaneous multi-device monitoring
• Supports standard industrial signals: DC 4–20 mA and 0–20 mA
• 16-bit A/D resolution with ±0.2% accuracy at 25 ±5°C
• High-speed conversion: 250 μs per channel
• Photo-coupler isolation between input terminals and PLC power
• Compact DIN-rail compatible design — 125 × 50 × 130 mm, 140 g
• Wide operating temperature: −20°C to +60°C

Technical Specifications

• Model: 2MLF-AC8A
• Series: Honeywell MasterLogic-200
• Input Channels: 8 (current input)
• Input Signal Range: DC 4–20 mA, DC 0–20 mA
• Input Resistance: 250 Ω
• Resolution: 16-bit
• Conversion Speed: 250 μs / channel (max)
• Accuracy: ±0.2% @ 25 ±5°C; ±0.3% @ 0–55°C
• Absolute Max Input: ±15 V, ±30 mA
• Isolation: Photo-coupler (input-to-system); no inter-channel isolation
• Terminal: 18-point terminal block
• I/O Addressing: Fixed 64 points, Variable 16 points
• Current Consumption: DC 5 V @ 420 mA
• Operating Voltage: 12–24 VDC (range 10–30 VDC)
• Protection: Reverse polarity, short circuit, surge, EMC
• Dimensions (W × H × D): 125 × 50 × 130 mm
• Weight: 0.14 kg
• Operating Temperature: −20°C to +60°C
• Storage Temperature: −25°C to +70°C
• Humidity: 5% to 95% RH (non-condensing)
• Certifications: CE

Typical Applications

• Chemical and petrochemical process control
• Water and wastewater treatment monitoring
• Power generation and distribution systems
• Manufacturing line instrumentation
• Utility systems requiring precise current signal acquisition

FAQ

Q: What input signals does the 2MLF-AC8A support?
A: The module accepts DC 4–20 mA and DC 0–20 mA signals from standard industrial transmitters and sensors.

Q: How many channels are available?
A: It provides 8 independent analog input channels for simultaneous monitoring.

Q: Is there isolation between channels?
A: Only channel-to-system isolation is provided via photo-coupler; channels are not isolated from each other.

Q: What is the conversion accuracy across temperature?
A: ±0.2% at 25 ±5°C and ±0.3% across 0–55°C, ensuring stable performance in varying environments.

Q: Can it be mounted on a DIN rail?
A: Yes, the module is DIN rail compatible for quick and secure installation in control cabinets.

Installation Guide

1. Power Down: Ensure the MasterLogic-200 rack is fully de-energized before inserting or removing the module. Hot-swapping is not supported.
2. Slot Selection: Insert the 2MLF-AC8A into any available I/O slot on the ML200 base unit.
3. Terminal Wiring: Use the 18-point terminal block. Connect 4–20 mA or 0–20 mA loop signals with shielded twisted-pair cable (0.3–0.75 mm²) to minimize noise.
4. Grounding: Ensure proper chassis grounding and shield grounding at one end only to avoid ground loops.
5. Configuration: Configure I/O addresses via SoftMaster programming software. Fixed allocation uses 64 points; variable allocation uses 16 points.
6. Verification: Power on the system and verify channel readings against known reference signals.

Selection Tips

• Choose the 2MLF-AC8A when you need 8 channels of current input with high resolution and fast conversion.
• If your application requires voltage input (0–10 V), consider the 2MLF-AV8A instead.
• For 4-channel high-speed analog input, evaluate the 2MLF-AC4H.
• Verify total backplane power budget — this module draws 420 mA at 5 VDC.
• Ensure your field transmitters are compatible with 250 Ω input resistance.