Honeywell 2MLI-D28A Digital Input Module DC 24V 64 Point – Product Description

Overview

The Honeywell 2MLI‑D28A Digital Input Module is engineered to capture discrete signals from switches, sensors, and alarms. It converts field signals into reliable data for Honeywell PLC and DCS systems.

Designed for high-density installations, the module supports dry contact, passive contact, or 24 VDC inputs. Moreover, optical isolation per channel ensures signal integrity and protection against electrical noise in demanding industrial environments.

Its hot-swappable design allows maintenance without shutting down the system, which is critical for continuous process industries. The compact form factor facilitates integration into Honeywell’s rack-based architecture efficiently.

Technical Specifications

Model Number: 2MLI‑D28A
Type: Digital Input Module
System Compatibility: Honeywell MasterLogic‑200 PLC / TDC 3000 DCS
Input Channels: 32–64 digital inputs (depending on version)
Signal Types Supported: Dry contact, passive contact, 24 VDC
Input Voltage Range: 0–30 VDC
Input Current: 3–5 mA typical
Response Time: <10 ms
Isolation: Optical isolation per channel
Operating Voltage: 5 VDC (via system backplane)
Dimensions (W × H × D): 22 × 124 × 126 mm / 426 × 98 × 19 mm
Weight: 0.15 kg
Operating Temperature: 0 °C to +60 °C
Storage Temperature: –40 °C to +85 °C
Humidity: 5–95% non‑condensing
Certifications: CE, UL508, CSA, TUV
Country of Origin: USA
Application Areas: Process automation, safety systems, industrial monitoring

FAQ

Q1: What input types does the 2MLI-D28A support?
It supports dry contact, passive contact, and 24 VDC inputs for versatile field connectivity.

Q2: Can the module be replaced without shutting down the system?
Yes, it is hot-swappable for continuous operation and maintenance convenience.

Q3: How many input channels does it provide?
It supports 32–64 digital input channels depending on the version.

Q4: Is the module protected against electrical noise?
Yes, each channel features optical isolation for signal integrity.

Q5: Which Honeywell systems is this module compatible with?
It works with Honeywell MasterLogic-200 PLC and TDC 3000 DCS systems.