Application Scenarios
At a coastal oil refinery in the Middle East,the central control room was located over 800 meters from the offshore loading terminal.The existing copper-based OCS bus suffered from severe signal degradation and electromagnetic interference(EMI)due to proximity to high-voltage power lines and marine equipment.
Engineers deployed the ABB SDCS-REB-1C 3BSE018101R1 at both ends of the link—connecting the main rack and the remote I/O cabinet—using fiber optic cables.The SDCS-REB-1C 3BSE018101R1 regenerated and retransmitted the OCS bus signals optically,eliminating EMI and signal loss.
Within hours of commissioning,stable communication was restored between the DCS CPU and remote I/O modules.Operators regained real-time visibility into valve positions and flow meters at the loading dock.This case demonstrates how the SDCS-REB-1C 3BSE018101R1 transforms unreliable long-distance connections into robust,deterministic links—turning a critical vulnerability into a resilient system backbone.
Parameter
Main Parameters Value/Description
Product Model SDCS-REB-1C 3BSE018101R1
Manufacturer ABB
Product Category Optical Bus Repeater/Extension Module
Function OCS backplane bus extension via fiber optics
Communication Medium Fiber optic cable(typically multimode)–immune to EMI
Max Extension Distance Up to 2 km(depending on fiber type and conditions)
Data Rate Matches OCS bus speed–transparent signal regeneration
Interfaces Electrical(for local rack)+Optical(for remote link)
LED Indicators TX(Transmit),RX(Receive),PWR(Power)–real-time status monitoring
Installation Method DIN rail mount(35mm)or panel mount–flexible integration
Power Supply 24 VDC(via backplane or external)–standard industrial voltage
Operating Temperature 0°C to 55°C–suitable for control cabinets
Isolation Type Galvanic isolation via optical coupling–prevents ground loops
Technical Principles and Innovative Values
Innovation Point 1:Optical Signal Regeneration
The SDCS-REB-1C 3BSE018101R1 acts as a signal repeater,receiving the degraded OCS bus signal from the local rack,cleaning and amplifying it,then retransmitting it over fiber optics.This regeneration ensures data integrity across long distances where copper cables would fail.
Innovation Point 2:EMI and Ground Loop Immunity
By converting electrical signals to optical,the SDCS-REB-1C 3BSE018101R1 breaks all electrical continuity between control and field zones.This eliminates ground potential differences and electromagnetic interference—common issues in power plants,refineries,and marine environments.
Innovation Point 3:Transparent Protocol Operation
The module operates at the physical layer,requiring no configuration or addressing.It is completely transparent to the DCS system,meaning the CPU sees remote I/O racks as if they were locally connected—simplifying engineering and diagnostics.
Innovation Point 4:High Availability and Redundancy Support
When used in pairs,the SDCS-REB-1C 3BSE018101R1 supports redundant fiber links,enhancing system resilience.Its robust design and minimal failure rate make it ideal for mission-critical applications where communication loss is unacceptable.
Application Cases and Industry Value
In a large thermal power station in India,the turbine control system required I/O expansion to a satellite building 600 meters away.Standard copper bus extension was prone to noise from high-power motor drives and transformers.
The engineering team installed two ABB SDCS-REB-1C 3BSE018101R1 units—one at the main control rack and one at the remote cabinet—connected via duplex fiber.The result was stable,jitter-free communication for all turbine protection signals(vibration,speed,valve position).
Over five years of operation,the link experienced zero communication faults.Maintenance staff reported that the LED indicators made troubleshooting quick and reliable.The plant’s reliability engineer noted that the SDCS-REB-1C 3BSE018101R1 was a“silent hero”in their DCS infrastructure—unseen but indispensable.
In a water desalination plant,the SDCS-REB-1C 3BSE018101R1 was used to link the central control room with remote pump stations exposed to salt spray and high humidity.The optical isolation prevented corrosion-related grounding issues,extending system life and reducing maintenance costs by over 30%.
Related Product Combination Solutions
SDCSCON3 3BSE018354R1:Main CPU that communicates through the SDCS-REB-1C 3BSE018101R1 to remote I/O racks.
SDCS-IOB-3 3BSE021252R1:Digital input module installed in remote rack,connected via extended bus.
SDCS-DSL-4 3ADT200005R0001:Output module used in extended I/O cabinets for pump and valve control.
OCS Fiber Optic Cable(ABB 3ADT900200):Duplex multimode fiber cable for reliable signal transmission.
SDCS-REB-1A 3BSE018101R2:Earlier version of the repeater,useful for mixed installations.
PM864 3BSE021252R1:Compatible CPU module for use in extended DCS configurations.
Fiber Optic Patch Panel(ABB 3ADT900150):For organized termination and protection of fiber links.
24VDC Redundant Power Supply:Ensures continuous operation of SDCS-REB-1C 3BSE018101R1 in critical applications.
Installation,Maintenance,and Full-Cycle Support
Installing the SDCS-REB-1C 3BSE018101R1 requires mounting on a DIN rail in both the master and remote racks.It connects to the local OCS backplane and interfaces with fiber optic cabling for long-distance transmission.Proper fiber handling and connector cleaning are essential to ensure low signal loss.The module is plug-and-play—no configuration needed—making integration fast and error-free.
Routine maintenance is minimal.Periodically inspect fiber connectors for dust or damage,and verify LED status(PWR,TX,RX)during inspections.The SDCS-REB-1C 3BSE018101R1 has no moving parts and is built for long-term reliability in industrial environments.If a fiber link fails,the module’s LEDs quickly indicate whether the issue is on the transmit or receive side,accelerating fault isolation.
We offer full technical support for system integration,fiber link planning,and retrofit projects involving legacy ABB DCS systems.Whether you’re extending an existing network or designing a new remote I/O layout,the SDCS-REB-1C 3BSE018101R1 provides a proven,high-integrity solution for distributed control.
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