Description

The ABB TK851V010 is a redundant CS31 communication interface module designed for the ABB AC 800M distributed control system (DCS), serving as a high-availability gateway between the central controller and remote CS31-based I/O clusters. With dual independent CS31 fieldbus channels, the ABB TK851V010 enables connection of up to 16 I/O modules per channel (32 total) across extended distances—up to 480 meters without repeaters—making it ideal for geographically dispersed applications such as water pumping stations, power plant auxiliaries, or pipeline monitoring systems.

As part of ABB’s CI85x/TK85x I/O family, the ABB TK851V010 (order number 4022.437.1924) provides automatic failover between its two CS31 buses in case of cable break, short circuit, or module fault, ensuring uninterrupted data flow to critical field devices. It supports hot swapping, allowing replacement during live operation without disrupting the control system—a key requirement in continuous-process industries. The module features galvanic isolation between the backplane and field networks, enhancing noise immunity in electrically harsh environments like substations or motor control centers.

Positioned as a robust, maintenance-friendly solution, the ABB TK851V010 integrates natively with ABB System 800xA, enabling centralized configuration, diagnostics, and firmware management. Its compact DIN-rail form factor and low power consumption make it suitable for both new installations and brownfield retrofits where space and heat dissipation are constraints.

Technical Specifications

Main Features and Advantages

✅ Dual-channel redundancy for maximum uptime: The ABB TK851V010 continuously monitors both CS31 buses. If the primary channel fails due to wiring fault or interference, traffic automatically shifts to the secondary channel within milliseconds—without controller intervention—ensuring process continuity in safety-critical applications.

✅ Extended reach with minimal infrastructure: Unlike Ethernet-based I/O that requires switches and managed networks, the CS31 bus uses simple daisy-chained cabling. The ABB TK851V010’s 480-meter range per channel reduces the need for repeaters or fiber converters, lowering installation cost in large facilities.

✅ Seamless System 800xA integration: The module appears as a native I/O station in System 800xA engineering tools. Engineers can configure I/O mapping, monitor bus load, and receive predictive alerts for degraded signal quality—all from the same environment used for control logic and HMI design.

✅ Robust industrial design: Encapsulated in a metal-reinforced plastic housing with conformal coating options, the ABB TK851V010 meets IEC 61000-6-2/4 EMC standards and operates reliably in high-vibration, high-humidity, or corrosive atmospheres.

Application Field

The ABB TK851V010 is widely deployed in industries requiring distributed, reliable, and maintainable I/O architectures:

• Power Generation: Connecting boiler soot blowers, condenser vacuum pumps, and cooling tower fans across turbine halls and auxiliary buildings.

• Water & Wastewater: Linking lift stations, chemical dosing skids, and UV disinfection units over municipal treatment sites spanning kilometers.

• Oil & Gas: Monitoring tank farm level sensors, firewater pumps, and cathodic protection systems in refineries and terminals.

• Mining & Minerals: Controlling conveyor belt emergency stops, dust suppression valves, and ore crusher lubrication units in remote areas.

By decoupling I/O from the main controller rack, the ABB TK851V010 reduces cabinet congestion, simplifies troubleshooting, and enables modular system expansion—key advantages in both greenfield projects and aging plant modernizations.

Related Products

• CI854A: Single-channel CS31 interface (non-redundant version of TK851V010)

• TK850: Termination base with screw terminals and diagnostic access for TK851V010

• CS31ICSI16N1: 16-channel isolated digital input module for CS31 clusters

• CS31ICSO16N1: 16-channel relay output module (complementary to inputs)

• AM801: AC 800M mounting rack with integrated backplane

• TB850: Alternative termination unit with fuse protection

• SA811: Battery backup module for configuration retention

• PM864A: High-performance AC 800M CPU for large-scale systems

Installation and Maintenance

? Installation Best Practices:

• Mount the ABB TK851V010 on a grounded DIN rail with at least 50 mm clearance for ventilation.

• Use ABB-approved CS31 cables (e.g., LiYCY 2×2×0.75 mm²) with proper shielding grounded at one end only.

• Terminate both CS31 bus ends with 120 Ω resistors (typically built into the last I/O module).

• Verify bus topology: daisy-chain only—no star or spur configurations.

?️ Maintenance Recommendations:

• Regularly check front-panel LEDs: green = active, red = fault (consult manual for blink codes).

• Monitor bus load and error counters via System 800xA diagnostics.

• Perform annual cable integrity tests (resistance, insulation).

• Replace the module during planned outages if operating near end-of-life (typical MTBF > 100,000 hours).