Manufacture	ABB
Item No	TU921S
Article number	3KDE175111L9210
Series	800XA Control Systems
Origin	Sweden
Dimension	155*155*67(mm)
Weight	0.4kg
Customs Tariff Number	85389091
Type	Redundant termination unit

 ABB TU921S 3KDE175111L9210 Redundant termination unit The ABB TU921S can be installed in non-hazardous areas or directly in Zone 1 or Zone 2 hazardous area depending on the selected system variant. S900 I/O communicates with the control system level using the PROFIBUS DP standard. The I/O system can be installed directly in the field, therefore the costs for marshalling and wiring are reduced.The system is rugged, fault-tolerant and easy to maintain. An integrated disconnect mechanism allows replacement during operation, which means that the power supply unit can be replaced without interrupting the primary voltage. TU921S Redundant Terminal Unit (TU16R-Ex) for 16 I/O modules, redundant communication and power supply (delivery includes CD910). S900 I/O type S. For installation in hazardous areas zone 1. For connecting intrinsically safe field devices installed in zone 2, zone 1 or zone 0. ATEX Certification for installation in Zone 1 Redundancy (Power and Communication) Hot Configuration in Run Hot Swap functionallity Extended Diagnostic Excellent configuration and diagnostics via FDT/DTM G3 – coating for all components Simplified maintenance with auto-diagnostics Termination unit for up to 16 I/O modules Prepared for redundant system power and communication Up to 4 terminals per channel Preselection of fieldbus address Prepared for certified field housing Mounting in Zone 1, Zone 2 or safe area possibleFrequently asked questions about the product are as follows: -What are the main functions of the ABB TU921S 3KDE175111L9210 redundant terminal unit? The TU921S acts as a redundant terminal unit, providing secure terminals for field signals from sensors, actuators and other devices, while also ensuring redundant communication and power supply paths to improve system reliability and minimize downtime. -How does the ABB TU921S ensure redundancy? The TU921S provides redundant communication paths and redundant power supplies, ensuring that if one communication or power supply path fails, the system can continue to operate using the backup path. This ensures high availability and fault tolerance of the system. -What communication protocols does the ABB TU921S support? Profibus, Modbus and Foundation Fieldbus, making it compatible with a wide range of field devices and control systems.