Product Overview

The Honeywell 2MLR-AC12 is a redundant power supply module for the MasterLogic-200R PLC system. It accepts an AC 110 V input and delivers a regulated 5 V DC output rated at 5.5 A. The module is used in redundant controller configurations where maintaining power availability is essential to continuous PLC operation.

In a process control installation, an unexpected power supply failure can interrupt CPU operation, communication, and I/O processing. The 2MLR-AC12 is part of the ML200R redundant power architecture, allowing the system to use redundant power supply arrangements rather than depending on a single power source module.

The module converts incoming AC power into the regulated DC voltage required by the PLC system. Its 5.5 A output capacity supports the power requirements of the associated controller and installed system modules, subject to the total current consumption of the configuration.

The 2MLR-AC12 also incorporates a RUN contact relay output. This contact can be used as part of the external power status monitoring arrangement, allowing the control system to receive an indication associated with power module operation.

Typical applications include continuous process control, industrial production lines, utility control systems, and automation installations where an interruption to PLC power can affect equipment operation or process continuity.

Technical Specifications

Product Features

1. Redundant Power Supply Configuration

The 2MLR-AC12 belongs to the MasterLogic-200R redundant power supply family. It is intended for installations where power supply redundancy is incorporated into the PLC system architecture to reduce the risk of interruption caused by an individual power module failure.

2. AC 110 V Input

The module operates with a rated AC 110 V input and accepts an input voltage range of 85–132 VAC. This makes it suitable for control installations using the corresponding AC power distribution arrangement.

3. Regulated 5 V DC Output

The 2MLR-AC12 converts incoming AC power into a regulated 5 V DC output with a tolerance of ±2%. This is the supply voltage required by the associated MasterLogic-200R system components.

4. 5.5 A Output Capacity

The module provides a rated output current of 5.5 A, with a corresponding output power of 27.5 W at 55°C. The actual power budget must account for the combined current consumption of the installed CPU and other modules.

5. Built-In Input Fuse

The power supply incorporates a built-in input fuse that is not user-replaceable. The AC input protection specification is 250 V / 3.15 A with a time-lag fuse characteristic.

6. Overcurrent Protection

The module includes overcurrent protection with a specified protection range of 6.0–13.0 A. This protection helps address abnormal output current conditions within the power supply circuit.

7. RUN Contact Relay Output

An integrated RUN contact provides a relay-based status interface. Its rated switching capacity is 24 VDC at 0.5 A, making it suitable for compatible external monitoring circuits.

8. Voltage Status LED

The voltage status indicator illuminates when the output voltage is normal. Maintenance personnel can use this indication during initial startup and routine power system inspections.

9. Short Interruption Tolerance

The specified allowable instantaneous input interruption is within 20 ms. This characteristic is relevant when evaluating the power quality and operating conditions of the PLC installation.

10. Basic and Expansion Base Installation

The module is installed in the power section of the applicable basic or expansion base, forming part of the MasterLogic-200R power distribution arrangement.

Working Principle

The 2MLR-AC12 receives AC 110 V from the external power distribution circuit and converts it into regulated 5 V DC for the MasterLogic-200R PLC system.

During normal operation, the input circuit processes the incoming AC supply, and the internal conversion stage produces the required DC output. The regulated voltage is then supplied to the associated PLC base and installed modules.

The module’s 5.5 A output rating determines the available current capacity. When configuring a redundant PLC system, engineers need to calculate the total power consumption of the CPU, communication interfaces, and other installed modules to ensure that the selected power arrangement meets the system requirements.

The redundant power architecture is intended to maintain system power availability if one power supply path encounters a fault. The CPU and associated redundant power arrangement monitor the relevant power failure status, allowing the system to respond to an abnormal power condition.

The integrated RUN contact provides an additional interface for external status monitoring. It can be incorporated into an appropriate control or alarm circuit so that power supply status is available for operational supervision.

Typical Power Operation Sequence:

1. AC 110 V is supplied to the 2MLR-AC12 input.
2. The internal power conversion circuit processes the incoming AC voltage.
3. The module generates a regulated 5 V DC output.
4. The output supplies the associated MasterLogic-200R system components.
5. The voltage status LED indicates normal output voltage.
6. The RUN contact provides a relay status interface for external monitoring.
7. In a redundant configuration, the system monitors power supply conditions and responds to a detected power failure according to its redundancy architecture.

Role in MasterLogic-200R Control Architecture

Within the MasterLogic-200R architecture, the 2MLR-AC12 supplies the DC power required by the redundant PLC system. Its function is different from that of the CPU and I/O modules: it does not execute control logic or process field signals, but maintains the electrical supply required for these operations.

The ML200R platform uses dedicated redundant hardware configurations, including redundant CPU modules, power supplies, and associated base and expansion interfaces.

The 2MLR-AC12 is the 110 V AC, 5.5 A power supply option within this arrangement. Other power supply variants offer different input voltages or output current ratings.

Industrial Applications

Installation and Maintenance

1. Verify Module Identification: Confirm that the installed unit is 2MLR-AC12 and distinguish it from the AC 220 V and higher-current variants.
2. Check Input Voltage: Ensure that the incoming supply is compatible with the rated AC 110 V input and the specified 85–132 VAC operating range.
3. Inspect AC Input Wiring: Check the incoming power connections, terminal condition, and protective grounding arrangement before energizing the module.
4. Review Power Consumption: Calculate the combined current requirements of the CPU and installed modules to confirm that the 5.5 A output capacity is sufficient.
5. Verify Redundant Configuration: Confirm that the module is installed as part of the intended MasterLogic-200R redundant power arrangement.
6. Check Base Compatibility: Install the power module in the designated power section of the applicable basic or expansion base.
7. Inspect Input Protection: Check the external power protection arrangement and remember that the internal input fuse is not designed for user replacement.
8. Monitor Output Voltage: Observe the voltage status LED during startup and confirm that the system receives its required DC supply.
9. Check RUN Contact Wiring: Verify the external monitoring circuit and ensure that the relay contact remains within its specified switching ratings.
10. Inspect Ventilation Conditions: Keep the installation area clear of obstructions and maintain the operating environment required by the PLC system.
11. Investigate Power Abnormalities: If the output voltage is abnormal, inspect the AC input, system load, wiring, and protection conditions before replacing the module.
12. Maintain Power System Records: Document module models, input voltage arrangements, output current calculations, and redundant power connections for future maintenance.

Compatible System Components

Recommended Related Models

Key Advantages

• Redundant power supply functionality for the MasterLogic-200R platform.
• Rated AC 110 V input.
• Input voltage range of 85–132 VAC.
• Regulated 5 V DC output.
• Rated output current of 5.5 A.
• Output power of 27.5 W at 55°C.
• Built-in input fuse protection.
• Integrated overcurrent protection.
• RUN contact relay output for status monitoring.
• Voltage status LED indication.
• Allowable instantaneous input interruption within 20 ms.
• Compatibility with the MasterLogic-200R redundant power architecture.

Technical FAQs

1. What is the difference between the 2MLR-AC12 and 2MLR-AC22?

Both modules provide a rated output current of 5.5 A and belong to the MasterLogic-200R redundant power supply family. The primary difference is their rated AC input voltage. The 2MLR-AC12 operates from AC 110 V, while the 2MLR-AC22 operates from AC 220 V.

2. Can the 2MLR-AC12 be used in a standard non-redundant MasterLogic-200 installation?

The 2MLR-AC12 belongs to the MasterLogic-200R redundant power supply family. It should be selected for the corresponding redundant system architecture rather than treated as a direct replacement for the standard 2MLP power supply modules.

3. What does the RUN contact output monitor?

The integrated RUN contact is a relay output associated with power module status. It is rated for 24 VDC at 0.5 A and can be incorporated into a compatible external monitoring or alarm circuit.

4. How should the 5.5 A output capacity be evaluated when selecting the module?

The total 5 V DC current consumption of the CPU and installed system modules must be calculated. The combined demand should remain within the module’s rated output capacity. For larger configurations, the 2MLR-AC13 or 2MLR-AC23 may be considered when their input voltage and system compatibility requirements are satisfied.