Brand:Honeywell DCS Item No.:2MLI-D28B Product Origin:USA Product Dimensions:120 x 25 x 110 mm Product Weight:0.15 kg Payment:T/T, Western Union, Credit Card Goods_stock:15 Shipping Port:Xiamen, China Lead Time:1-3 Days Condition:Brand New And Original Warranty:1 Year Certificate:COO
The Honeywell 2MLI-D28B Digital Input Module is part of the MasterLogic-200 programmable logic controller I/O family. It is designed for applications that require centralized acquisition of a large number of 24 V DC digital signals.
With 64 input points, configurable response times, and photocoupler isolation, the module supports the integration of field signals into PLC-based automation systems. It is suitable for industrial control panels, machine automation, and process monitoring installations where dependable digital signal acquisition is essential.
When sourcing a replacement or spare, confirm the module's hardware revision, system compatibility, and wiring configuration against the installed equipment.
Technical Specifications
Parameter
Specification
Brand
Honeywell
Model
2MLI-D28B
Product Type
Digital Input Module
PLC Series
MasterLogic-200
Number of Inputs
64 points
Input Type
24 V DC, source type
Rated Input Voltage
24 V DC
Operating Voltage Range
20.4–28.8 V DC
Rated Input Current
Approximately 4 mA
Input Resistance
Approximately 5.6 kΩ
ON Threshold
At least 19 V DC / 3 mA
OFF Threshold
11 V DC or lower / 1.7 mA or lower
Isolation Method
Photocoupler isolation
Selectable Response Time
1, 3, 5, 10, 20, 70, 100 ms
Default Response Time
3 ms
Isolation Voltage
AC 560 V RMS, 3 cycles
Isolation Resistance
10 MΩ or higher
Common Configuration
32 points per COM
Current Consumption
60 mA
External Connection
Two 40-point connectors
Dimensions
120 × 25 × 110 mm
Weight
0.15 kg / 0.33 lb
Recommended Related Models
Honeywell 2MLI-D28A Digital Input Module – 64-point, 24 V DC input module with source/sink input capability.
Honeywell 2MLI-D24A Digital Input Module – 32-point, 24 V DC source/sink input module.
Honeywell 2MLI-D24B Digital Input Module – 32-point, 24 V DC source-type input module.
Honeywell 2MLI-D22B Digital Input Module – 16-point, 24 V DC source-type input module.
Honeywell 2MLI-D21A Digital Input Module – 8-point digital input module with source/sink capability.
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Applications
Factory Automation: Collects digital signals from switches, sensors, and other field devices on production lines.
Machine Control: Monitors operating states, interlocks, and equipment status signals.
Process Automation: Acquires discrete signals from field instruments and auxiliary equipment.
Packaging Systems: Supports monitoring of machine positions, product detection, and sequence operations.
Industrial Monitoring: Collects multiple digital status signals for centralized PLC-based supervision.
Control Panel Integration: Provides 64 input points in a single module to help reduce I/O slot requirements.
Advantages
64 Digital Input Points: Supports a high density of 24 V DC input signals.
Photocoupler Isolation: Provides electrical isolation between input circuits and internal module circuitry.
Configurable Response Time: Supports selectable input response times from 1 ms to 100 ms through CPU parameters.
Input Status Indicators: LEDs help technicians monitor input states during commissioning and troubleshooting.
Two External Connectors: Uses two 40-point connectors for field wiring and signal integration.
Compact Installation: The supplied dimensions of 120 × 25 × 110 mm support space-conscious control cabinet layouts.
Technical FAQs
Q1: What is the Honeywell 2MLI-D28B used for?
It is used to collect digital ON/OFF signals from field devices and transmit their status to a Honeywell MasterLogic-200 PLC.
Q2: How many digital input channels does the 2MLI-D28B provide?
The module provides 64 digital input points.
Q3: What is the rated input voltage?
The rated input voltage is 24 V DC, with an operating voltage range of 20.4–28.8 V DC under the specified ripple conditions.
Q4: Is the 2MLI-D28B a source-type input module?
Yes. The 2MLI-D28B is specified as a source-type digital input module. Check the field device output arrangement and wiring requirements before installation.
Q5: What isolation method does this module use?
It uses photocoupler isolation to provide electrical separation between the input circuits and internal circuitry.
Q6: What is the rated input current per channel?
The rated input current is approximately 4 mA per input.
Q7: What is the input response time?
The response time can be configured to 1, 3, 5, 10, 20, 70, or 100 ms through CPU parameters. The default setting is 3 ms.
Q8: How can technicians check the status of the inputs?
The module provides input-status LED indication. The indicator arrangement should be checked against the module's user manual during commissioning and maintenance.
Q9: What external connections does the 2MLI-D28B use?
It uses two 40-point connectors. Confirm the applicable connector accessories and terminal wiring arrangement before connecting field signals.
Q10: What should be checked before replacing an existing module?
Verify the exact model number, MasterLogic-200 system compatibility, input wiring type, channel assignment, connector arrangement, and CPU configuration before replacement.
