Honeywell 2MLI-D22A 16-Point Digital Input Module

Product Overview

The Honeywell 2MLI-D22A is a 16-point digital input module designed for the MasterLogic-200 (ML200) PLC platform. It supports both sink and source-type DC 24 V inputs, making it highly versatile for interfacing with a wide range of industrial sensors, switches, and field devices. With configurable response times, robust photo-coupler isolation, and individual LED indicators, the 2MLI-D22A ensures reliable signal acquisition in factory automation, building control, and energy systems.

Key Features

• 16 digital input channels with sink/source flexibility
• DC 24 V rated input with wide operating range (20.4–28.8 VDC)
• Configurable response time: 1 ms to 100 ms (default 3 ms)
• Photo-coupler isolation — AC 560 V rms / 3 cycles
• Individual LED indicators for real-time input status
• 18-point terminal block (M3 × 6 screw) for secure field wiring
• Compact and lightweight — 120 g

Technical Specifications

• Model: 2MLI-D22A
• Product Type: Digital Input Module
• Series: MasterLogic-200
• Input Channels: 16 points
• Input Type: Sink / Source (DC 24 V)
• Rated Input Voltage: DC 24 V
• Operating Voltage Range: DC 20.4 V – 28.8 V
• On Voltage / Current: ≥ DC 19 V / ≥ 3 mA
• Off Voltage / Current: ≤ DC 11 V / ≤ 1.7 mA
• Input Resistance: Approx. 5.6 kΩ
• Response Time: Configurable 1–100 ms; default 3 ms
• Isolation Method: Photo-coupler isolation
• Isolation Voltage: AC 560 V rms / 3 cycles
• Isolation Resistance: ≥ 10 MΩ
• Common Method: 16 points per COM
• Current Consumption: 30 mA
• Operation Indicator: LED ON when input is active
• External Connection: 18-point terminal block (M3 × 6 screw)
• Cable Size: 0.3–0.75 mm² (twisted pair, ≤ 2.8 mm diameter)
• Compressed Terminal: R1.25-3 (sleeve type not allowed)
• Weight: 0.12 kg
• Operating Temperature: 0°C to +55°C
• Storage Temperature: −25°C to +70°C
• Humidity: 5% to 95% RH (non-condensing)
• Certifications: CE

Typical Applications

• Factory automation and production line monitoring
• Building management and HVAC control
• Energy distribution and substation monitoring
• Safety interlock and limit switch interfaces
• Process control pushbutton and selector switch inputs

FAQ

Q: Does the 2MLI-D22A support both NPN (sink) and PNP (source) sensors?
A: Yes. The module accepts DC 24 V signals in either sink or source wiring configuration, providing maximum flexibility.

Q: What is the default response time?
A: The default is 3 ms, but it is configurable from 1 ms to 100 ms via the programming software to match application requirements.

Q: How many inputs share a common terminal?
A: All 16 points share one COM terminal.

Q: Can the module be hot-swapped?
A: No. Module insertion or removal must be performed with the system fully de-energized.

Q: What wire gauge is recommended?
A: Use 0.3–0.75 mm² twisted pair cable with a maximum outer diameter of 2.8 mm. Sleeve-type compression terminals are not allowed.

Installation Guide

1. Safety First: Disconnect all power to the MasterLogic-200 rack before handling the module.
2. Slot Installation: Insert the 2MLI-D22A into an available I/O slot, ensuring the module is fully seated and retention clips engage.
3. Terminal Wiring: Connect field devices to the 18-point terminal block. For sink wiring, connect the COM to 0 V; for source wiring, connect the COM to +24 V.
4. Cable Preparation: Strip wire insulation to 6–7 mm. Use R1.25-3 compression terminals (non-sleeve type). Torque M3 screws to 0.5–0.6 N·m.
5. Response Time Setup: Open SoftMaster software and configure the input filter time (1–100 ms) based on your signal characteristics. Use shorter times for high-speed counting and longer times for noisy mechanical switches.
6. Verification: Apply power and toggle each input. Confirm the corresponding LED illuminates and the PLC registers the input state correctly.

Selection Tips

• Select the 2MLI-D22A for 16-point DC 24 V digital input with flexible sink/source wiring.
• If you need more input density, consider the 2MLI-D28A (64-point) or 2MLI-D24A (32-point) modules.
• For AC voltage inputs, evaluate the 2MLI-A21A or 2MLI-A12A AC input modules.
• Verify sensor output type (NPN vs. PNP) before wiring to ensure correct sink/source configuration.
• For noisy industrial environments, use shielded twisted-pair cable and maintain separation from high-voltage power cables.