Honeywell 2MLR-DBSF Fiber Optic Expansion Driver Module for MasterLogic-200R

Product Overview

The Honeywell 2MLR-DBSF is a fiber optic expansion driver module for the MasterLogic-200R (ML200R) redundant PLC system. It enables long-distance, noise-immune expansion between the main CPU rack and remote I/O expansion racks using fiber optic cable. The DBSF module transmits and receives I/O data over optical fiber, making it ideal for installations where the expansion base is located hundreds of meters from the main cabinet or in high-EMI environments such as steel mills and VFD rooms.

Key Specifications

• Product Type: Expansion Driver Module (Fiber Optic)
• Series: MasterLogic-200R (Redundant)
• Interface: Fiber Optic (FO)
• Connector Type: SC type fiber optic connector
• Transmission Distance: Up to 15 km (depending on fiber type)
• Data Rate: High-speed serial link for real-time I/O synchronization
• Redundancy Support: Compatible with ML200R dual-ring topology
• Current Consumption: 80 mA (from 5V internal bus)
• External Power: DC 24V (20.4–28.8V)
• Dimensions (W x H x D): 27.4 mm x 90 mm x 70 mm
• Weight: Approx. 110 g
• Operating Temperature: 0°C to +55°C

Features & Benefits

• Immunity to electromagnetic interference — fiber optic transmission is completely immune to VFD noise, welding equipment, and high-voltage switching, ensuring 100% data integrity in harsh electrical environments
• Long-distance expansion — supports cable runs up to 15 km, enabling remote I/O cabinets in large plant sites, pipeline stations, and distributed water treatment facilities
• Redundant ring topology — pairs with the ML200R dual-path I/O cable architecture; if one fiber path breaks, the system automatically switches to the alternate path without process interruption
• SC connector compatibility — industry-standard SC connectors allow use of pre-terminated fiber patch cords, reducing installation time and splicing costs
• Galvanic isolation — optical isolation eliminates ground loops between main and remote cabinets, protecting equipment from lightning-induced transients

Typical Applications

• Steel mill rolling line remote I/O over 500 m from the main MCC
• Offshore platform topside to subsea control module fiber link
• Water treatment plant distributed pump station I/O aggregation
• Cement kiln remote temperature and pressure monitoring
• Substation automation with high-voltage switchyard interference
• Any application requiring >100 m separation between CPU and I/O racks

Installation Guide

1. Install in ML200R main base — the 2MLR-DBSF occupies a dedicated expansion driver slot in the ML200R main base (2MLR-M02P or 2MLR-M06P).
2. Connect fiber optic cable — insert SC-type fiber patch cords into the TX and RX ports. Verify TX on the main rack connects to RX on the remote rack, and vice versa.
3. Apply 24V external power — connect DC 24V to the external power terminals for the fiber optic transceiver circuits.
4. Install paired module in remote base — install the corresponding 2MLR-DBSF in the remote expansion base (2MLR-E08P or 2MLR-E12P).
5. Verify link status — check the LINK and ACT LEDs on both modules. A solid green LINK LED indicates proper optical alignment and connection.
6. Test redundancy — if using dual-ring topology, disconnect one fiber path and confirm the system maintains I/O communication via the alternate path.

FAQ

Q: What is the difference between 2MLR-DBSF and 2MLR-DBST?
A: The 2MLR-DBSF uses fiber optic (FO) media for long-distance, noise-immune expansion. The 2MLR-DBST uses twisted pair (TP / UTP) copper cable for shorter runs up to 100 meters. Choose DBSF for >100 m or high-EMI environments; choose DBST for <100 m in clean electrical environments.

Q: What type of fiber cable is required?
A: The 2MLR-DBSF supports multimode fiber (62.5/125 μm or 50/125 μm) for distances up to 2 km and single-mode fiber (9/125 μm) for distances up to 15 km. Use SC-SC patch cords or pre-terminated trunk cables.

Q: Can I use this with the non-redundant ML200 system?
A: No. The 2MLR-DBSF is designed exclusively for the ML200R redundant system. Non-redundant ML200 systems use the 2MLB-E expansion bases with ribbon cable (2MLC-Exxx) instead.

Q: What is the difference between DBSF and DBDF?
A: The 2MLR-DBDF is a dual redundant expansion driver with fiber optic (used in fully redundant dual-ring configurations). The 2MLR-DBSF is a single expansion driver with fiber optic. For maximum availability, use DBDF in pairs.

Selection Tips

• Select 2MLR-DBSF when your remote I/O cabinet is >100 meters from the main rack or located in a high-EMI environment.
• For short copper runs (<100 m) in clean electrical rooms, the 2MLR-DBST is more cost-effective.
• Always order spare SC-SC fiber patch cords (2 meters and 5 meters) for troubleshooting and maintenance.
• Verify your fiber type (multimode vs. single-mode) matches the distance requirement before cable procurement.
• For fully redundant dual-ring architectures, pair the DBSF with 2MLR-DBDF on the alternate path.