Product Details
The Honeywell 2MLR-DBST, also cataloged as the 2MLR-DBST Expansion Driver, operates as a dedicated hardware component for deterministic rack expansion and CPU interface bus driving within 2MLR redundant CPU platforms. Mounted directly at the CPU connector position of an extension base, it drives electrical logic communication over twisted-pair CAT5 media across distance intervals up to 100 m between extension chassis units.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 2MLR-DBST |
| Brand | Honeywell |
| Origin | Industrial Standard Assembly |
| Weight | 0.1 kg (Shipping Weight: 1.5 kg) |
| Dimensions | Base Module Form Factor |
| Operating Temp | 0 to 55 deg C |
| Power Consumption | Backplane Powered |
| Compatible CPUs | 2MLR-CPUH/T, 2MLR-CPUH/F |
| Media Type | Electrical (TP / CAT5) |
| Max Inter-Base Distance | 100 m |
| Loader Interface | Extension Drive USB |
| Station Number Range | 1 to 31 |
| Mounting Position | CPU slot (CPU0 connector) on extension base |
4-20 mA HART Loop Protocol & DCS Integration
The 2MLR-DBST maintains high-integrity physical layer signals between local CPU bases and remote I/O chassis carrying field process telemetry. Built-in channel-to-channel isolation on the backplane communication drivers mitigates ground potential shifts and cross-talk noise between expansion nodes. This isolation preserves measurement accuracy for critical 4-20 mA HART loop instrumentation and DCS analog cards attached to remote extension racks across long copper cable runs.
Frequently Asked Questions
Q: What happens if an invalid station number outside the 1 to 31 range is assigned to the 2MLR-DBST?
A: Assigning a station address outside the permitted range of 1 to 31 triggers an immediate system configuration error, preventing backplane bus synchronization with the main CPU.
Q: Can the loader connection on the 2MLR-DBST be accessed while mounted on an extension base?
A: Yes, the module features a front-facing extension drive USB connector that allows programming and diagnostic loader access directly at the base site.
Field Installation Guidelines
- Power down the extension chassis completely before inserting the 2MLR-DBST into the designated CPU0 connector slot.
- Route industrial-grade TP/CAT5 cabling away from high-voltage power lines and variable frequency drives to minimize electromagnetic interference.
- Verify that the total cable distance between connected extension bases does not exceed 100 m to prevent transmission signal degradation.
- Set the station address selector to a valid integer between 1 and 31 prior to energizing the base power supply.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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