Honeywell 2MLI-D22A Digital Input Module

Honeywell 2MLI-D22A 16-Point DC 24V Digital Input Module

Product Introduction

The 2MLI-D22A is a digital input module designed for the Honeywell MasterLogic-200 programmable logic controller series. This card captures discrete field signals and passes them to the CPU through the backplane. Specifically, it handles pushbuttons, limit switches, proximity sensors, relay contacts, and other on/off devices common in machine control.

Panel builders favor this module for its flexible wiring options. Furthermore, the current source and sink input design supports both PNP and NPN sensor types on the same card. Meanwhile, the 16-point density balances channel count against rack space. Consequently, the 2MLI-D22A covers a wide range of discrete sensing duties without extra hardware.

Technical Specifications

The module provides 16 input points with a DC 24V nominal rating. Wiring supports either current source or current sink configuration, so engineers match the module to the existing sensor convention. This dual-mode design removes the need for separate NPN and PNP card variants.

Core input parameters include:

• Input Points: 16 points

• Input Voltage: DC 24V

• Input Mode: Current source / sink selectable

• Operating Temperature: 0 to 55 °C

• Storage Temperature: -25 to +70 °C

The 16-point layout keeps field wiring organized across the terminal block. Besides, each channel provides status indication through the module's front-panel LEDs. Therefore, technicians can verify signal presence without a meter during commissioning and troubleshooting.

Environmental Ratings

The module operates within a temperature range of 0 to 55 °C. Additionally, storage temperature spans -25 to +70 °C for shipping and warehouse conditions. Meanwhile, operating and storage humidity both range from 5 to 95% RH without condensation.

The unit requires an environment free of corrosive gas and dust. In addition, it operates at altitudes below 2000 m with a contamination level below 2. These ratings match typical enclosed control cabinets in clean production areas and process rooms.

Mechanical Parameters and Mounting

The 2MLI-D22A mounts as a plug-in card inside the MasterLogic-200 rack. Its compact housing aligns with the other I/O modules in the series for a uniform panel appearance. Moreover, backplane power feeds the card, so no separate supply wiring is needed at the module.

The lightweight construction adds minimal load to the rack assembly. In addition, the front connector accepts field wiring directly, which reduces intermediate terminal blocks in the panel.

Installation Guide

First, switch off the rack power and confirm that the backplane carries no voltage. Next, insert the 2MLI-D22A into an available I/O slot and push until the connector seats fully. Then, tighten the retaining screws to secure the card against vibration.

After mounting, wire the field devices according to the chosen source or sink mode. Specifically, verify the sensor type (PNP or NPN) before connecting the common terminals. Subsequently, assign the I/O addresses in the configuration software. Finally, activate each input in turn and confirm the LED status matches the expected state.

Packaging List

• 1x Honeywell 2MLI-D22A Digital Input Module

• 1x Anti-static protective bag

• 1x Individual cardboard box with shock-absorbing foam

FAQ

Q1: How many input points does the 2MLI-D22A provide?
A1: The module offers 16 digital input points at DC 24V, connected through the front terminal block for organized field wiring.

Q2: Can this module accept both PNP and NPN sensors?
A2: Yes, the 2MLI-D22A supports current source and current sink input wiring, so both PNP and NPN sensor types work without a separate card.

Q3: What is the operating temperature range?
A3: It operates from 0 to 55 °C and stores safely from -25 to +70 °C, with humidity tolerance of 5 to 95% RH without condensation.

Q4: Does the module show input status on the front panel?
A4: Yes, each channel provides an LED indication, letting technicians verify signal presence during commissioning and fault finding.

Q5: How do you ship this product?
A5: We ship via Fedex, UPS, and DHL. Each unit travels in anti-static packaging inside a shock-absorbing box for safe delivery.