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Phone: +86 16626708626Description
Product Model: 2MLT-DMMA
Product Brand: Honeywell
Product Series: MasterLogic-200 PLC Accessories / Base Options
Product Features:
- Acts as a dust/dummy module for unused I/O or base slots in MasterLogic-200 systems
- Prevents dust, debris, or contaminants from entering the PLC chassis or expansion base
- Compatible with both main base and expansion base slots in the MasterLogic-200 line
- Simple mechanical installation, no electrical or active circuitry (dummy cover)
Functional Role & System Fit
In a programmable logic controller (PLC) system, unused slots pose a risk: dust, contaminants, or mechanical damage can degrade performance over time, cause short circuits, or compromise system reliability. The 2MLT-DMMA is a dummy / blank / dust-protection module for Honeywell’s MasterLogic-200 PLC family. Its sole purpose is to fill unused slots (in the base rack or expansion rack) to maintain the integrity and cleanliness of the system.
While it carries no active electrical function (i.e. it does not process signals, provide I/O, or contribute logic), the 2MLT-DMMA helps preserve environmental and mechanical stability. Because it mirrors the module slot form factor, it maintains correct alignment, shielding, and board spacing in the chassis. In effect, it is a placeholder, preventing foreign particles or accidental contact when modules are removed or left blank.
This module is part of the “Base Options” section of the MasterLogic-200 specifications. The official MasterLogic-200 spec sheet lists “Dummy module” for 2MLT-DMMA in the Base Options category, naming it a dust protection module for unused slots.
Given that many industrial plants expand or reconfigure PLC systems over time, a dummy module like 2MLT-DMMA is frequently employed during interim periods when some I/O slots are not yet populated, or to replace a module that has been removed. In that role, it offers a low-cost, no-brain “insurance” for the hardware.
- 2MLT-DMMA
Technical Characteristics & Benefits
Though not an active system component, the 2MLT-DMMA has certain physical and compatibility attributes worth knowing.
Physical / Mechanical Properties
- The dummy module shares the same mechanical dimensions and connector interface footprint as standard I/O or interface modules in the MasterLogic-200 family, allowing drop-in installation in a slot without requiring rework.
- It is dustproof, designed to shield the internal backplane or slot contacts from dust, debris, and contaminants.
- Because it has no active circuitry, the module has no electrical specification (no power draw, no processing) — essentially inert in the system.
System Compatibility
- Compatible with both main base and expansion base slots of the MasterLogic-200 PLC line.
- Ensures that the system chassis remains sealed and structurally consistent even when modules are absent. This is particularly important in industrial environments where temperature, humidity, or airborne particulate ingress is possible.
- Since the dummy module uses no active parts, it does not affect bus timing, logic, or backplane signals — it is invisible to the control logic.
The principal benefits are:
- Protection: prevents dust, debris, and accidental intrusion
- Structural integrity: maintains consistent mechanical mounting and alignment
- Simplicity: adds no complexity or electrical load
- Cost-effectiveness: much cheaper than leaving slots open or building custom covers
Technical Specifications Table
Because the 2MLT-DMMA is a passive module, many “specs” are minimal or derived from the system context. Here’s a useful reference table:
| Parameter | Value / Description | Notes |
|---|---|---|
| Model | 2MLT-DMMA | Honeywell dummy / blank module |
| Module Type | Dummy / Dust Protection Module | Fills unused I/O slots in MasterLogic-200 systems |
| Electrical Activity | None | No electrical signals or power draw |
| Mechanical Compatibility | Matches MasterLogic-200 base / expansion module form factor | For proper drop-in |
| Dust / Contaminant Protection | Yes | Shields backplane and internal slots from contaminants |
| Environment Impact | Negligible | No thermal or electrical influence |
| Slot Type | Base / Expansion slots | Fits standard module slots in MasterLogic-200 series |
| Warranty / Condition | New stock or refurbished with supplier warranty | e.g. 12 months, depending on vendor lists |
Use this as a reference — actual physical tolerances and mechanical dimensions should be confirmed via the MasterLogic-200 hardware documentation.
Installation & Maintenance Insights
Even though it’s simple, correct use of the dummy module ensures long-term system robustness.
Installation
- Insert the 2MLT-DMMA into the vacant slot just as you would a regular module, aligning connector pins carefully so as not to damage the backplane.
- Ensure seating is firm; do not leave half-engaged connectors, which could expose slot contacts to contamination.
- Because it has no active function, no configuration or wiring is required.
- Use it temporarily or permanently whenever a slot is unused.
Maintenance
- On periodic system maintenance, inspect the dummy modules along with active modules — check for physical damage, dust accumulation, or any sign of deformation.
- Clean gently, but avoid harsh solvents or abrasion that might damage the module or slot edges.
- If the 2MLT-DMMA becomes damaged (cracked housing, bent edges), replace it to preserve protection.
- In environments with high dust or corrosive atmosphere, consider a rack enclosure and filters; the dummy module alone doesn’t seal the entire system cabling or ventilation, but helps internally.
Because this module is passive, maintenance is minimal — but neglecting blank slots is a common cause of backplane faults, corrosion, or debris accumulation over time.
