Description

ABB TK856 3BSE057021R1 Product Description

Technical Specifications

• Product Model: TK856 3BSE057021R1
• Brand: ABB
• Warranty: One Year
• Input Voltage: 5V DC low-voltage differential signal for controller internal communication
• Operating Temperature: -20°C to +70°C
• Storage Temperature: -30°C to +85°C
• Response Time: Microsecond-level signal transmission delay
• Protection Class: IP30 for cabinet internal installation
• Accuracy Class: Signal integrity error rate less than 0.001%
• Output Frequency: 30kHz dedicated RCU link clock frequency
• Rated Current Range: 0–10mA low-power signal loop
• Communication Interface: Custom D-SUB male-to-male pre-terminated connector
• Supported Protocols: ABB proprietary RCU redundant controller synchronization protocol
• Overload Capacity: Withstands 120% transient voltage surge without signal distortion
• Dimensions: 1000mm (Length) × 7mm (Width) × 7mm (Thickness), net weight 0.09kg

Product Overview

The TK856 3BSE057021R1 is a factory-prefabricated RCU Redundant Control Unit link cable exclusively engineered for ABB AC800M DCS control system, serving as the dedicated physical interconnection medium for dual redundant PM891 CPU controller pairs. This cable undertakes real-time heartbeat detection, master-slave role arbitration, and full runtime data mirroring between the primary and standby processing units, laying the hardware foundation for fault-tolerant hot-standby operation of the core automation controller.

It resolves critical risks caused by controller single-point failure in high-reliability industrial scenarios, including unplanned process shutdown, production batch loss, and safety interlock malfunction triggered by main CPU downtime. The fully shielded twisted-pair internal structure suppresses electromagnetic interference generated by variable frequency drives, high-power motors and switching power supplies in control cabinets, maintaining stable synchronous data exchange even in electrically harsh industrial environments.

System integrators, plant automation maintenance engineers, power plant control technicians and marine automation supervisors are the core beneficiaries of this accessory. The pre-molded D-SUB connectors eliminate manual wiring errors during on-site retrofitting and spare part replacement, shorten system commissioning and troubleshooting cycles, and help end users comply with IEC 61508 SIL3 functional safety requirements for continuous process industries such as power generation, petrochemical processing, and pulp and paper manufacturing.