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ABB TU865 Module Termination Unit

Configured for physical termination and internal distribution of I/O signals and Modulebus connections in ABB System 800xA platforms, the ABB TU865 3BSE078712R1 (TU865 Module Termination Unit) provides the mounting and electrical interface for compatible I/O modules.

Hardware Specifications

Parameter	Specification
Model	TU865
Full Part Number	3BSE078712R1
Brand	ABB
Product Type	Module Termination Unit (MTU)
Product Series	ABB System 800xA / Advant OCS
Mounting Type	DIN rail, EN 60715
Bus Connection	Modulebus
Redundancy Support	Supports redundant I/O module configurations
Operating Temp	-40 deg C to +70 deg C
Protection Class	IP20
Dimensions	58.5 mm W x 170 mm H x 64.5 mm D
Primary Function	I/O module termination, mounting, and internal signal/power distribution

I/O Density Scaling and Modulebus Interface

The TU865 provides the physical termination interface between compatible System 800xA I/O modules and field wiring. It also provides the associated Modulebus connection required by the installed I/O architecture.

The MTU does not perform independent signal processing. Instead, it establishes the mechanical and electrical connection required for the associated I/O module. Therefore, channel capacity and signal characteristics depend on the installed I/O module rather than on the TU865 itself.

For redundant I/O configurations, the termination arrangement supports the corresponding redundant module architecture. System-level I/O density scaling must therefore follow the applicable I/O module, MTU, Modulebus, and controller configuration limits.

Frequently Asked Questions

Q: Does the TU865 process I/O signals independently?

A: No. The TU865 functions as a termination and mounting unit. The installed I/O module performs the signal acquisition, output, or processing function.

Q: Does the TU865 support redundant I/O configurations?

A: Yes. The supplied technical data identifies the TU865 as supporting redundant I/O module configurations. The complete redundancy arrangement depends on the compatible I/O modules and System 800xA architecture.

Q: What is the operating temperature range of the TU865?

A: The supplied data specifies an operating range of -40 deg C to +70 deg C.

Field Installation Guidelines

• Install the TU865 on a compatible DIN rail in accordance with the mechanical requirements of EN 60715.
• Verify that the mounting position provides sufficient clearance for installation, wiring, module insertion, and removal.
• Confirm that the selected I/O modules are mechanically and electrically compatible with the TU865 before installation.
• Connect Modulebus and field wiring according to the applicable ABB System 800xA hardware documentation.
• Route signal wiring separately from high-current power conductors and other sources of electromagnetic interference where the installation requires it.
• Terminate cable shields according to the plant grounding and EMC design. Avoid creating unintended shield current paths.
• Check all terminal connections for correct conductor placement and mechanical retention before energizing the system.
• For redundant configurations, verify the complete redundant I/O topology before commissioning.
• Do not infer the TU865 power consumption from the connected I/O load; use the electrical data for the installed I/O modules and system configuration.
• Observe the IP20 enclosure limitation when selecting the installation environment and enclosure arrangement.

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