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- 2MLR-DBDHS
- Redundant Expansion Driver
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- 150 × 25 × 100 mm
- 0.1 kg
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Product Overview
The Honeywell 2MLR-DBDHS is a TP/FO Single-Mode Redundant Expansion Driver for the MasterLogic-200R PLC system. It provides the communication interface between the redundant CPU architecture and remote I/O expansion bases, supporting dual I/O link communication through twisted-pair and single-mode fiber-optic transmission.
In large industrial installations, the main controller and remote I/O cabinets are often separated by considerable distances. Some expansion stations may be located close to the main control cabinet, while others are installed in remote process areas where optical communication is more suitable. The 2MLR-DBDHS accommodates this type of network arrangement by supporting both electrical TP communication and single-mode fiber-optic communication.
For example, a petrochemical facility may have a central PLC cabinet in the control room and several remote I/O stations distributed across different production units. Twisted-pair connections can be used for compatible local communication links, while single-mode fiber provides an option for longer optical cable routes. The hybrid driver allows these transmission media to be incorporated into the redundant expansion architecture.
The 2MLR-DBDHS belongs to the dual-ring redundant expansion-driver family and is associated with the 2MLR-E12H redundant expansion base. It works with the controller, expansion hardware, and corresponding communication cabling to exchange process information between the central PLC and distributed I/O equipment.
Its main distinction from the standard 2MLR-DBDH is the single-mode optical configuration. Both support TP/FO hybrid communication, but the DBDHS is intended for installations using single-mode fiber. This difference is important when replacing an existing module because optical transmission characteristics and network compatibility must match the installed system.
For maintenance and system expansion, the complete model number should be checked rather than selecting a driver based only on its general TP/FO designation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | 2MLR-DBDHS |
| Product Series | MasterLogic-200 |
| System Type | MasterLogic-200R |
| Product Type | Redundant Expansion Driver |
| Module Category | Expansion Redundancy Driver (Dual Ring) |
| Communication Interface | TP/FO Hybrid |
| Fiber Configuration | Single-Mode Fiber Optic |
| Communication Media | Twisted Pair and Single-Mode Fiber |
| Network Architecture | Dual I/O Link Redundancy |
| Compatible Expansion Base | 2MLR-E12H |
| Dimensions | 150 × 25 × 100 mm |
| Weight | 0.1 kg |
Product Features
- Hybrid TP/FO Communication: Supports twisted-pair electrical communication and single-mode fiber-optic transmission.
- Single-Mode Optical Configuration: Distinguishes this model from the standard multimode-compatible hybrid driver.
- Dual I/O Link Redundancy: Belongs to the redundant expansion hardware family used in MasterLogic-200R.
- Remote I/O Connectivity: Establishes communication between the central controller and distributed expansion equipment.
- Mixed Transmission Media: Accommodates installations requiring both copper-based and optical communication links.
- Optical Electrical Isolation: Fiber-optic transmission avoids a direct conductive signal path between connected equipment.
- Industrial Noise Immunity: Optical links are less susceptible to electromagnetic interference than conventional copper communication wiring.
- Dedicated Expansion Driver: Installs in the designated redundant expansion-driver position.
- MasterLogic-200R Integration: Works within Honeywell’s modular PLC expansion architecture.
- Specific Replacement Identification: The DBDHS model designation helps distinguish the single-mode hybrid redundant configuration from other driver variants.
Product Working Principle
The Honeywell 2MLR-DBDHS functions as a communication driver in the MasterLogic-200R redundant I/O network. Its purpose is to transfer data between the controller and remote expansion equipment through the configured TP/FO communication arrangement.
The hybrid configuration supports two transmission media:
TP (Twisted Pair): Transfers electrical communication signals through copper-based network cabling.
FO (Fiber Optic): Transfers communication data through optical signals carried by single-mode fiber.
The basic communication arrangement is:
MasterLogic-200R CPU → Redundant Expansion Driver → TP/Single-Mode FO Network → Remote Expansion Base → I/O Modules
During normal operation, the CPU exchanges input and output information with the distributed I/O stations. Input modules collect signals from field instruments such as pressure transmitters, temperature sensors, flow meters, and equipment status contacts.
The expansion network transfers the collected information to the controller. The CPU processes the incoming data according to its PLC program and sends corresponding output commands to the remote I/O modules.
The redundant architecture provides two communication paths. The hybrid driver supports the specified TP/FO arrangement within this dual-link structure. If a communication fault occurs, the system can use the remaining available path according to its configured redundancy logic.
Single-mode fiber is particularly relevant when optical communication links need to cover longer cable routes. Its transmission characteristics differ from those of multimode fiber, so the optical interface and connected equipment must be matched correctly.
The 2MLR-DBDHS does not execute control programs or independently process field signals. Its function is to maintain the communication interface required by the redundant expansion system.
Role in Honeywell MasterLogic-200R Control System Architecture
The 2MLR-DBDHS occupies the redundant expansion-driver position in the MasterLogic-200R architecture. It connects the redundant expansion base to the controller’s dual I/O communication network.
Its hybrid single-mode configuration is useful in installations where the network design requires both electrical and optical transmission. The CPU handles the control logic, while the expansion driver maintains the communication connection to the distributed I/O hardware.
MasterLogic-200R CPU → Main CPU Base → Dual I/O Communication Network → 2MLR-DBDHS → 2MLR-E12H Expansion Base → I/O Modules → Field Devices
| System Component | Function |
|---|---|
| 2MLR-CPUH/S | Redundant CPU configuration with single-mode fiber communication |
| 2MLR-CPUH/T | Redundant CPU configuration with TP communication |
| 2MLR-M02P | Main CPU base for a two-module installation |
| 2MLR-M06P | Main CPU base for a six-module installation |
| 2MLR-DBDHS | Provides the hybrid TP/FO single-mode interface for redundant expansion |
| 2MLR-E12H | Redundant expansion base with 12 slots |
| 2MLR-DBDH | Standard TP/FO redundant expansion driver |
| 2MLR-DBDFS | Single-mode fiber-optic redundant expansion driver |
| MasterLogic I/O Modules | Acquire field inputs and control connected output devices |
| Field Instruments | Supply process measurements and equipment status information |
| Industrial Actuators | Execute output commands from the PLC system |
The communication media, controller configuration, and expansion-driver type must be considered together. A hybrid interface does not mean that every optical and electrical connection can be mixed without checking the original network topology.
Industrial Applications
The 2MLR-DBDHS is relevant to MasterLogic-200R installations where redundant I/O communication requires a combination of twisted-pair and single-mode fiber-optic transmission.
| Industrial Application | Typical Use |
|---|---|
| Oil and Gas Processing | Connecting remote I/O stations across large process facilities |
| Petrochemical Plants | Supporting hybrid communication between distributed control cabinets |
| Refinery Automation | Linking remote expansion equipment across separate process units |
| Power Generation | Connecting distributed I/O installations through mixed communication media |
| Pipeline Pumping Stations | Supporting communication with remote monitoring and control equipment |
| Compressor Stations | Connecting equipment status and process signals to the central PLC |
| Water Treatment Facilities | Linking distributed instrumentation and control cabinets |
| Chemical Processing | Supporting redundant process monitoring and control |
| Large Manufacturing Facilities | Extending PLC communication across production areas |
| Continuous Process Plants | Maintaining communication between central controllers and remote I/O stations |
Installation and Maintenance
- Verify the Complete Part Number: Confirm that the replacement is Honeywell 2MLR-DBDHS rather than the standard 2MLR-DBDH or another redundant driver.
- Check Communication Configuration: Verify that the installation requires the TP/FO hybrid single-mode arrangement.
- Inspect the Expansion Base: Confirm compatibility with the 2MLR-E12H redundant expansion base.
- Review the Network Diagram: Identify the primary and secondary I/O communication paths and determine which connections use TP and which use single-mode fiber.
- Isolate the Equipment: Follow the approved shutdown and electrical isolation procedures before removing or installing the module.
- Inspect the Driver Connector: Check the module interface and expansion-base connector for contamination, loose connections, or mechanical damage.
- Check TP Cabling: Inspect twisted-pair cables for damaged insulation, loose terminations, and incorrect routing.
- Inspect Optical Cables: Check single-mode fiber cables for damaged jackets, excessive bending, crushed sections, or other physical defects.
- Clean Fiber Connectors: Inspect optical connector end faces and use appropriate cleaning equipment before reconnecting them.
- Verify Communication Paths: Confirm that the TP and FO connections are assigned to their intended interfaces according to the original system configuration.
- Perform Redundancy Testing: Verify communication with the remote expansion base and test the configured redundant links under controlled conditions.
- Record Maintenance Results: Document the driver model, expansion-base position, communication connections, and functional test results.
When troubleshooting communication faults, inspect the electrical and optical paths separately. A problem with a TP connection may produce different symptoms from optical signal attenuation or fiber connector contamination.
Compatible System Components
| Component | Function |
|---|---|
| Honeywell 2MLR-CPUH/S | Redundant CPU configuration with single-mode fiber communication |
| Honeywell 2MLR-CPUH/T | Redundant CPU configuration with TP communication |
| Honeywell 2MLR-E12H | Redundant expansion base with 12 slots |
| Honeywell 2MLR-DBDH | Standard TP/FO redundant expansion driver |
| Honeywell 2MLR-DBDFS | Single-mode FO redundant expansion driver |
| Honeywell 2MLR-DBDT | TP redundant expansion driver |
| Honeywell 2MLR-DBDF | FO redundant expansion driver |
| Honeywell 2MLC-F201 | Multimode fiber-optic synchronization cable with LC connectors |
| MasterLogic-200 I/O Modules | Handle distributed analog and digital field signals |
| Single-Mode Fiber-Optic Cabling | Provides optical communication between compatible system components |
| TP Communication Cabling | Provides electrical communication connections within the expansion network |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Honeywell 2MLR-DBDH | Redundant Expansion Driver, TP/FO | Standard hybrid redundant expansion communication |
| Honeywell 2MLR-DBDFS | Redundant Expansion Driver, FO, Single Mode | Single-mode optical redundant I/O communication |
| Honeywell 2MLR-DBDT | Redundant Expansion Driver, TP | Twisted-pair redundant expansion communication |
| Honeywell 2MLR-DBDF | Redundant Expansion Driver, FO | Fiber-optic redundant expansion communication |
| Honeywell 2MLR-CPUH/S | Redundant CPU, FO Single Mode | Single-mode redundant controller configuration |
| Honeywell 2MLR-E12H | Redundant Expansion Base, 12 Slot | Distributed I/O expansion with dual-link redundancy |
Key Advantages
- Hybrid twisted-pair and fiber-optic communication.
- Single-mode optical configuration.
- Supports the MasterLogic-200R dual I/O link architecture.
- Suitable for distributed I/O installations.
- Supports communication across different transmission media.
- Optical transmission reduces susceptibility to electromagnetic interference.
- Compatible with the designated redundant expansion architecture.
- Dedicated model identification for single-mode hybrid installations.
Technical FAQs
1. What does TP/FO (Single Mode) mean on the 2MLR-DBDHS?
TP/FO identifies the hybrid communication configuration, combining twisted-pair electrical communication with fiber-optic transmission. The Single Mode designation specifies the optical configuration. This distinguishes the DBDHS from the standard 2MLR-DBDH hybrid driver.
2. What is the difference between the 2MLR-DBDHS and 2MLR-DBDFS?
Both belong to the MasterLogic-200R redundant expansion-driver family and support single-mode optical configurations. The DBDHS is the hybrid TP/FO version, while the DBDFS is the fiber-optic version. The correct choice depends on the communication media required by the installed network.
3. Can the 2MLR-DBDHS replace the standard 2MLR-DBDH?
They share the hybrid TP/FO communication designation, but the DBDHS includes the single-mode optical configuration. They should not be treated as automatically interchangeable. The existing fiber type, controller interface, network topology, and hardware configuration must be checked before replacement.
4. What should be inspected if the redundant I/O communication becomes unstable?
Check both communication paths separately. For TP connections, inspect cable terminations and physical cable condition. For optical connections, check fiber compatibility, connector cleanliness, and cable routing. Also verify the expansion-base installation and controller communication status before replacing the driver.