The ABB TU921S (3KDE175111L9210) is a high-performance redundant termination unit designed for the Advant S900 I/O system. This unit provides a robust interface for up to 16 I/O modules, supporting critical industrial processes that require high availability and fault tolerance.

Features

• Supports redundancy for both power and communication paths to ensure system uptime.
• Designed for installation in hazardous areas with ATEX certification for Zone 1.
• Features Hot Swap functionality and Hot Configuration in Run, allowing for maintenance without process interruption.
• Equipped with G3 conformal coating on all components for enhanced environmental protection.
• Advanced diagnostic capabilities accessible via FDT/DTM for simplified troubleshooting and maintenance.
• Integrated auto-diagnostics to reduce downtime and simplify system health monitoring.

Applications

The TU921S is primarily used in process automation environments where S900 I/O systems are deployed, such as chemical, petrochemical, and power generation plants. Its redundant architecture makes it suitable for safety-critical loops and high-availability control applications.

Technical Specifications

Installation Guidelines

• Ensure the unit is mounted in a clean, dry, and vibration-free environment suitable for its IP rating.
• Verify that the power supply is disconnected before installing or removing any I/O modules from the termination unit.
• Use shielded cabling for communication lines to minimize electromagnetic interference (EMI) in industrial environments.
• Ensure proper grounding of the termination unit chassis to the system common ground to maintain signal integrity and safety.
• Follow standard ESD (Electrostatic Discharge) handling procedures when touching internal components or connectors.

FAQ

Does this unit support hot-swapping?
Yes, the TU921S supports hot-swap functionality, allowing you to replace modules while the system is running.

Is this unit suitable for hazardous locations?
Yes, the TU921S is ATEX certified for installation in Zone 1 hazardous areas.

How many I/O modules can be connected to this unit?
This termination unit is designed to accommodate up to 16 S900 I/O modules.