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- 2MLR-DMMA
- Dummy Module
- USA
- 110 × 55 × 95 mm
- 0.417 kg
- Xiamen, China
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Product Overview
The Honeywell 2MLR-DMMA is a Dummy Module used to cover unused power supply slots in the MasterLogic-200R PLC system. Its primary purpose is to protect vacant positions in the power section of the PLC base from dust and unwanted foreign material.
In industrial control cabinets, not every available power supply position is necessarily occupied. A system may initially operate with one power supply configuration while leaving another designated position unused. During maintenance, equipment upgrades, or changes to the power arrangement, these vacant positions can remain exposed if no protective cover is installed.
The 2MLR-DMMA addresses this situation by occupying the unused power supply slot. It maintains a protective cover over the opening rather than performing any electrical power conversion or control function.
For example, in a petrochemical plant or compressor station, a MasterLogic-200R controller may be installed inside a cabinet exposed to dust generated by nearby machinery. If a power supply position is left open, airborne particles can enter the internal area of the base. Installing the 2MLR-DMMA helps keep the unused position covered during normal operation.
An important distinction exists between the 2MLR-DMMA and the 2MLT-DMMA. Although both are classified as dummy modules, they serve different installation positions. The 2MLR-DMMA is intended for unused power supply slots in MasterLogic-200R, whereas the 2MLT-DMMA is used to cover unused I/O module slots.
The 2MLR-DMMA does not supply voltage, distribute electrical power, communicate with the CPU, or process field signals. It is a passive protective component used to maintain the physical condition of the PLC rack.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | 2MLR-DMMA |
| Product Series | MasterLogic-200 |
| System Type | MasterLogic-200R |
| Product Type | Dummy Module |
| Module Category | Dust Protection Module |
| Application | Unused Power Supply Slot |
| Function | Covers unused power supply positions |
| Electrical Function | None |
| System Compatibility | MasterLogic-200R |
| Dimensions | 110 × 55 × 95 mm |
| Weight | 0.417 kg |
Product Features
- Power Slot Protection: Covers unused power supply positions in the MasterLogic-200R base.
- Dust Protection: Helps prevent dust and foreign material from entering vacant power supply openings.
- Dedicated Redundant System Application: Specifically identified for MasterLogic-200R installations.
- Passive Construction: Does not require an external power connection or electrical configuration.
- Rack Position Coverage: Occupies the designated unused power supply position.
- Maintenance Convenience: Keeps vacant positions covered during maintenance and system modifications.
- Component Identification: Distinguishes the power-slot dummy module from the I/O-slot version.
- Simple Installation: Serves as a physical protective component rather than an active electronic module.
- Cabinet Housekeeping: Helps maintain an orderly and protected PLC rack arrangement.
- No Signal Processing: Does not participate in PLC logic execution, communication, or field signal acquisition.
Product Working Principle
The 2MLR-DMMA operates as a passive protective cover within the MasterLogic-200R power supply section.
Unlike an active power module, it does not contain a power conversion function or provide electrical output. Its operation is based on physically occupying an otherwise unused power supply position.
The installation arrangement is straightforward:
MasterLogic-200R Base → Unused Power Supply Position → 2MLR-DMMA → Physical Coverage of the Opening
When installed, the module covers the vacant position and helps restrict the entry of dust and foreign particles into the exposed area.
This function is particularly useful in industrial cabinets where ventilation, nearby machinery, and routine maintenance can expose equipment to airborne contaminants. Even when a power supply position is not being used, leaving the opening uncovered can create an unnecessary point of exposure.
The 2MLR-DMMA does not alter the electrical characteristics of the power supply system. It does not generate 5 V DC, regulate input voltage, provide redundant power, or monitor the operating status of the PLC.
Its purpose is limited to physical protection and maintaining the intended condition of an unused power supply slot.
Role in Honeywell MasterLogic-200R Control System Architecture
The 2MLR-DMMA belongs to the physical protection arrangement of the MasterLogic-200R PLC base.
The power section of a PLC rack accommodates the power supply hardware required by the controller system. When a designated power supply position is not occupied, the 2MLR-DMMA can be installed to cover that position.
Unlike the CPU, power supply, communication, and I/O modules, this component does not participate in the electrical or logical operation of the control system.
MasterLogic-200R Base → Power Supply Section → Installed Power Supply / Unused Slot → 2MLR-DMMA for Vacant Position
| System Component | Function |
|---|---|
| 2MLR-DC42 | 24 V DC input redundant power supply module |
| 2MLR-AC12 | 110 V AC input redundant power supply |
| 2MLR-AC22 | 220 V AC input redundant power supply |
| 2MLR-AC13 | 110 V AC input redundant power supply, higher-current version |
| 2MLR-AC23 | 220 V AC input redundant power supply, higher-current version |
| 2MLR-DMMA | Covers unused power supply positions |
| 2MLR-M02P | Main CPU base for a two-module installation |
| 2MLR-M06P | Main CPU base for a six-module installation |
| 2MLR-E12H | Redundant expansion base with 12 slots |
| MasterLogic-200R CPU | Executes PLC programs and manages system operation |
The 2MLR-DMMA should be used according to the designated power supply slot arrangement. It is not a replacement for an operating power supply and does not increase the electrical capacity of the PLC base.
Industrial Applications
The 2MLR-DMMA is used wherever a MasterLogic-200R PLC installation has an unused power supply position that needs physical protection.
| Industrial Application | Typical Use |
|---|---|
| Oil and Gas Processing | Covering unused power supply positions in PLC control cabinets |
| Petrochemical Plants | Protecting vacant power module openings in process control systems |
| Chemical Processing | Reducing dust exposure in unused rack positions |
| Power Generation | Maintaining the physical condition of PLC power sections |
| Water Treatment Facilities | Covering unused power supply positions in pump and treatment control cabinets |
| Compressor Stations | Protecting vacant PLC power slots in equipment control panels |
| Refinery Automation | Maintaining unused rack positions in distributed control installations |
| Industrial Manufacturing | Covering vacant power supply positions in production-line PLC cabinets |
| Pipeline Control Systems | Protecting unused power module openings in remote automation cabinets |
| Continuous Process Industries | Maintaining clean and protected PLC rack installations |
Installation and Maintenance
- Verify the Model Number: Confirm that the component is 2MLR-DMMA and not the 2MLT-DMMA I/O dummy module.
- Identify the Correct Position: Locate the unused power supply position in the MasterLogic-200R base.
- Check Slot Compatibility: Ensure that the vacant position is intended for the 2MLR-DMMA rather than an I/O module or communication module.
- Inspect the Module: Check the dummy module for cracks, deformation, or other physical damage before installation.
- Check the Slot Opening: Inspect the vacant power supply position for accumulated dust or foreign material.
- Clean the Installation Area: Remove loose contamination using an appropriate method before fitting the protective module.
- Install the Dummy Module: Position the 2MLR-DMMA in the designated unused power supply slot according to the rack installation arrangement.
- Check Mechanical Seating: Confirm that the module is correctly positioned and securely retained.
- Inspect Adjacent Power Supplies: Check nearby installed power modules for loose connections or visible damage during the same maintenance operation.
- Maintain Cabinet Cleanliness: Keep the surrounding control cabinet free from excessive dust and contamination.
- Perform Periodic Inspection: Check that the dummy module remains correctly installed during routine PLC cabinet inspections.
- Replace Damaged Components: Replace the dummy module if it becomes cracked, deformed, or unable to remain securely positioned.
The 2MLR-DMMA is a passive protective component. It does not require electrical calibration, software configuration, or communication testing.
Compatible System Components
| Component | Function |
|---|---|
| Honeywell 2MLR-DC42 | Redundant power supply with 24 V DC input |
| Honeywell 2MLR-AC12 | Redundant power supply with 110 V AC input |
| Honeywell 2MLR-AC22 | Redundant power supply with 220 V AC input |
| Honeywell 2MLR-AC13 | Redundant power supply with 110 V AC input, higher-current version |
| Honeywell 2MLR-AC23 | Redundant power supply with 220 V AC input, higher-current version |
| Honeywell 2MLR-M02P | MasterLogic-200R main CPU base |
| Honeywell 2MLR-M06P | MasterLogic-200R main CPU base |
| Honeywell 2MLR-E12H | MasterLogic-200R redundant expansion base |
| Honeywell 2MLT-DMMA | Dummy module for unused I/O module slots |
| MasterLogic-200R CPU Modules | Controller hardware for PLC program execution |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Honeywell 2MLR-DC42 | Redundant Power Supply Module, 24 V DC Input | DC power supply for MasterLogic-200R |
| Honeywell 2MLR-AC12 | Redundant Power Supply Module, 110 V AC Input | AC power supply configuration |
| Honeywell 2MLR-AC22 | Redundant Power Supply Module, 220 V AC Input | 220 V AC power supply configuration |
| Honeywell 2MLR-AC13 | Redundant Power Supply Module, 110 V AC Input | Higher-current AC power configuration |
| Honeywell 2MLR-AC23 | Redundant Power Supply Module, 220 V AC Input | Higher-current 220 V AC power configuration |
| Honeywell 2MLT-DMMA | Dummy Module | Protection of unused I/O module slots |
Key Advantages
- Protects unused power supply positions.
- Helps prevent dust and foreign material from entering vacant rack openings.
- Dedicated application for MasterLogic-200R.
- Passive component with no electrical power requirement.
- No PLC software configuration required.
- Simple installation and inspection.
- Distinct from the I/O-slot dummy module.
- Supports orderly maintenance of the PLC power section.
Technical FAQs
1. What is the main function of the Honeywell 2MLR-DMMA?
The 2MLR-DMMA is a dust protection module for unused power supply slots in the MasterLogic-200R system. It covers vacant power positions to help prevent dust and foreign material from entering the exposed area of the PLC base.
2. What is the difference between the 2MLR-DMMA and 2MLT-DMMA?
The main difference is their installation position. The 2MLR-DMMA covers unused power supply slots in MasterLogic-200R, while the 2MLT-DMMA covers unused I/O module slots. They should not be selected interchangeably based only on their shared Dummy Module designation.
3. Does the 2MLR-DMMA provide electrical power or affect PLC operation?
No. The 2MLR-DMMA is a passive protective component. It does not generate voltage, distribute power, process signals, or communicate with the CPU. Its function is limited to covering an unused power supply position.
4. When should the 2MLR-DMMA be installed?
It should be installed when a designated power supply position in a MasterLogic-200R base is left unused and requires physical protection. It is particularly useful during system maintenance, cabinet modifications, or installations where not all available power supply positions are occupied.