3BSE038726R1 ABB TU833 S800 I/O Extended MTU

Product Overview

The ABB TU833 (3BSE038726R1) serves as a high-density Extended Module Termination Unit (MTU) designed for the S800 I/O and AC 800M controller hardware portfolio. This 100% brand new and original component provides the essential mechanical and electrical interface for up to 16 I/O channels. It bridges field wiring to the I/O modules while distributing the ModuleBus signals and process power. Designed for the rigors of process industries and utilities, the TU833 facilitates scalable distributed control by allowing seamless expansion of communication interfaces and I/O modules within the System 800xA architecture.

Technical Specifications

Engineering Advantages

• Dual-Group Power Isolation: The TU833 divides process voltage into two individually isolated groups. Each group features its own 6.3 A fuse, ensuring that a localized fault in one power circuit does not compromise the entire I/O rack, thereby increasing total system availability.

• Automatic Addressing Logic: This unit eliminates manual addressing errors during installation. It generates the correct address for the attached I/O module by automatically shifting outgoing position signals to the next MTU in the sequence.

• High-Density Field Termination: By supporting 16 channels in a compact 12.6 cm wide frame, the TU833 reduces the footprint required for high-point-count I/O. Each channel provides two I/O connections and one ZP (0V) connection for clean, organized wiring.

• Hot-Swappable Functionality: The robust design allows for module replacement without interrupting the system bus. This capability minimizes downtime during maintenance or when scaling the AC 800M controller extension bus (CEX bus).

• Secure Mechanical Integration: A precision-engineered mechanical latch locks the TU833 firmly to standard DIN rails. This prevents electrical disconnects caused by industrial vibrations or accidental physical impact in harsh plant environments.

FAQs

• How do I determine the correct fuse rating for the TU833?

  While the unit ships with standard 6.3 A fuses, you must select the final fuse rating based on your specific application’s load and cooling requirements. Consult the S800 I/O Getting Started guide (Power and Cooling chapter) to calculate the appropriate ampacity for your field devices.

• What is the primary difference between the TU833 and standard MTUs?

  The TU833 is an "Extended" MTU. It typically offers a larger number of termination points (16 channels) and specialized bus extension capabilities compared to standard 8-channel units, making it ideal for higher-density cabinet layouts.

• Does the TU833 support grounding for shielded cables?

  Yes, the unit provides integrated grounding support and robust mechanical housing to ensure that signal shields maintain continuity, which is critical for protecting analog signals from electromagnetic interference (EMI).

• Is this module compatible with all AC 800M controllers?

  The TU833 interfaces with the AC 800M controller via the CEX bus and ModuleBus. It supports the majority of S800 I/O expansion modules and communication interfaces utilized in the System 800xA environment.