Overview

The ABB DSSS171 3BSE005003R0001 Voting Unit is a specialized redundancy and safety module used in ABB’s distributed control systems. It performs signal voting and comparison functions to ensure that critical control decisions are based on validated, fault-tolerant inputs. The unit enhances system reliability by eliminating single-point failures and supporting Triple Modular Redundancy (TMR) architectures.

The DSSS171 is widely applied in power generation, process industries, and safety-critical automation systems, where continuous availability and secure decision-making are essential. Moreover, it integrates seamlessly with ABB’s AC 800M controllers and S800 I/O systems, providing a robust solution for high-integrity control applications.

Technical Data

Typical Applications

• Power generation: Safe voting for turbine and excitation control signals.

• Process industries: Fault-tolerant decision-making in chemical, oil & gas, and pharmaceutical plants.

• Water treatment facilities: Supervises redundant sensor inputs for pumps, mixers, and monitoring equipment.

• Manufacturing automation: Supports safety interlocks and redundancy in robotic and machine systems.

• Infrastructure systems: Building automation and utility monitoring requiring high reliability.

Example:
In a nuclear power plant, the DSSS171 validates redundant sensor signals before passing them to the control system, ensuring safe and secure operation under all conditions.

FAQ

Q1: What is the ABB DSSS171 Voting Unit used for?
It is a redundancy and safety module that performs signal voting to ensure fault-tolerant control.

Q2: What redundancy method does it support?
Triple Modular Redundancy (TMR) for high-integrity applications.

Q3: Which ABB systems are compatible?
AC 800M controllers and S800 I/O systems.

Q4: Does it include diagnostics?
Yes, with built-in supervision and error reporting.

Q5: What industries typically use this unit?
Power generation, process industries, water treatment, and manufacturing automation.