Honeywell 2MLP-DC42 DC Input Power Supply Module 24V 6A

Product Overview

The Honeywell 2MLP-DC42 is a DC input power supply module for the MasterLogic-200 (ML200) non-redundant PLC system. It accepts DC 24V input and delivers regulated DC 5V at 6A to power the CPU, I/O modules, and communication modules on the backplane. Designed for battery-backed and solar-powered installations, it provides reliable power conversion with built-in overcurrent, overvoltage, and short-circuit protection.

Key Specifications

• Product Type: DC Input Power Supply Module
• Series: MasterLogic-200 / ML200 (Non-Redundant)
• Input Voltage: DC 24V (19.2–28.8V range)
• Input Current: Up to 80 A peak (inrush)
• Output Voltage: DC 5V ±2%
• Output Current: 6.0 A
• Efficiency: ≥85% (typical)
• Ripple Voltage: ≤50 mV peak-to-peak (at full load)
• Response Time: ≤10 ms
• Protection: Overcurrent (≥6.6A), Overvoltage (5.5–6.5V), Short-circuit
• Input Fuse: Built-in, UL standard slow blow (non-changeable)
• Run Contact: Built-in relay contact for power status indication
• Allowed Instantaneous Interruption: 10 ms and shorter
• Dimensions (W x H x D): 15.2 cm x 2.4 cm x 12.6 cm
• Weight: Approx. 0.5 kg (500 g)
• Mounting: One-slot install in MasterLogic-200 rack
• Operating Temperature: -20°C to +60°C
• Storage Temperature: -25°C to +70°C

Features & Benefits

• DC 24V input for battery-backed systems — ideal for UPS-backed control systems, solar-powered remote sites, and marine DC bus architectures
• 6A high capacity — supports fully loaded 12-slot non-redundant racks with CPU, communication, and high-density I/O modules
• 10 ms hold-up time — maintains 5V output during brief input interruptions (<10 ms), preventing CPU restarts during utility voltage sags
• Built-in protections — overcurrent, overvoltage, and short-circuit protection safeguard the power supply and downstream modules from electrical faults
• Non-changeable internal fuse — UL-rated slow-blow fuse provides fault isolation without user maintenance
• Run contact output — dry relay contact interfaces with alarm systems or BMS for remote power status monitoring

Typical Applications

• Battery-backed control systems in power substations
• Solar-powered remote pump stations and RTUs
• Marine vessel DC bus control systems
• Telecom shelter environmental control
• Emergency generator control panels
• Any application requiring DC input power for the PLC rack

Installation Guide

1. Verify DC input source — confirm your site provides stable DC 24V (19.2–28.8V). Verify the battery or DC bus can supply the required current.
2. Install in power supply slot — mount the 2MLP-DC42 in the dedicated power supply slot of the ML200 main base (2MLB-MxxA).
3. Connect DC input — wire DC 24V positive and negative to the input terminals. Observe correct polarity.
4. Connect earth ground — bond the PE terminal to the cabinet earth bus with 2.5 mm² wire.
5. Wire run contact — connect the built-in relay contact to your alarm system or PLC diagnostic input for remote monitoring.
6. Verify output — use a precision multimeter to confirm 5.00 V DC ±2% at the backplane power test points.

FAQ

Q: What is the difference between 2MLP-DC42 and 2MLP-ACF2?
A: The 2MLP-DC42 accepts DC 24V input. The 2MLP-ACF2 accepts AC 85–264V input. Both output 5V DC at 6A. Choose DC42 for battery-backed or DC bus applications; choose ACF2 for standard AC mains applications.

Q: What is the difference between 2MLP-DC42 and 2MLR-DC42?
A: The 2MLP-DC42 is for non-redundant ML200 systems. The 2MLR-DC42 is for redundant ML200R systems with active-active load sharing. They are not interchangeable due to different mechanical and electrical interfaces.

Q: Can I use this in a redundant ML200R system?
A: No. The 2MLP-DC42 is designed for non-redundant ML200 bases only. Redundant systems require 2MLR-DC42 (7.5A redundant DC input).

Q: What happens during a power interruption >10 ms?
A: If the DC input is interrupted for more than 10 ms, the 2MLP-DC42 will shut down and the CPU will enter stop mode. Ensure your battery or UPS can maintain 24V during switchover events.

Selection Tips

• Select 2MLP-DC42 for DC 24V battery-backed or solar-powered non-redundant systems.
• For AC mains input, choose 2MLP-ACF2 (AC 85–264V) instead.
• For redundant DC input, upgrade to 2MLR-DC42 (7.5A) in an ML200R system.
• Verify your battery capacity — the 2MLP-DC42 draws approximately 1.5A at 24V input for a fully loaded rack.
• Always use fused DC input wiring — size the external fuse at 125% of the maximum input current.