ABB 3BSC690075R1 TU890 S800 I/O Module Termination Unit

Description

The TU890 is a specialized Module Termination Unit (MTU) configured for the S800 I/O system, offering a dedicated Intrinsic Safety (IS) interface for hazardous area deployments. This critical hardware unit provides 3x9 signal terminals for efficient field wiring routing while isolating safe-area circuitry from potentially explosive environments. By establishing a structurally sound connection layer for companion I/O blocks, it forms the underlying framework for localized distributed marshalling loops.

The assembly includes an integrated physical wiring separator designed to enforce correct physical clearance gaps between intrinsically safe loops and non-IS conductors. This component is highly compatible across a broad spectrum of ABB controller segments, including the System 800xA (versions 4.0 through 6.0), Compact Product Suite, and legacy platforms like Advant OCS with Master SW or MOD 300 SW. Its compact footprint ensures strict conformity to industrial spacing metrics within local sub-distribution and power cabinets.

Features

• Module Termination Unit integrated with an Intrinsic Safety (IS) interface topology
• Configured with 3x9 signal terminals for precise field wire allocation
• Includes an engineering-grade physical wiring separator to preserve field segment isolation
• Direct-fit mechanical alignment for a wide range of S800 I/O module families
• Compact configuration suitable for dense panel cabinet setups

Applications

• Hazardous environment field instrument termination
• System 800xA distributed control architectures
• Compact Product Suite I/O marshalling assemblies
• Advant Fieldbus 100 remote network nodes
• Petrochemical, refining, and gas processing control systems

Technical Specifications

Installation Guidelines

• Wiring Separation: The included physical wiring separator must remain correctly positioned during installation. Maintain strict physical separation distances between intrinsically safe and non-intrinsically safe cabling runs inside the cable ducts.
• DIN Rail and Mechanical Mounting: Mount the unit firmly onto standard grounding rails, confirming that all rear locking latches engage properly to absorb engine room vibration.
• ESD Precautions: Utilize standardized anti-static field gear, including an ESD wrist strap, prior to clicking the active S800 I/O modules into the termination base socket.
• Terminal Assignment Execution: Wire field signals strictly in compliance with the 3x9 designated terminal layout schema to ensure proper instrument power and loop-back mapping.

FAQ

What is the core engineering purpose of this specific termination unit?

The unit provides a secure, physical connection base for standard S800 modules while establishing an Intrinsic Safety interface boundary for wiring operating in hazardous industrial locations.

What function does the integrated wiring separator fulfill?

The wiring separator forms an explicit physical isolation barrier between adjacent wire groupings, ensuring high-voltage noise or non-IS loops cannot inadvertently bridge into isolated circuits.

Is this hardware base backward compatible with older Advant OCS distributed platforms?

Yes, it is formally documented as compatible with Advant OCS with Master SW and Advant OCS with MOD 300 SW configurations utilizing standard S800 footprints.

Does this termination framework contain internal backup batteries or charge cells?

No, this unit is a passive structural interface and contains exactly zero internal batteries.

What are the exact physical dimensional values required for internal enclosure mapping?

The unit measures 194 mm in height, 58.5 mm in width, and 64 mm in depth, with a net standalone hardware mass of 0.3 kg.