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ABB TU818 Compact Module Termination Unit

Configured for field-wiring termination and ModuleBus distribution in ABB S800 I/O systems, the ABB TU818 3BSE069209R1 (TU818 Compact Module Termination Unit) provides 32 signal channels with a 50 V rating and a 40 pole screw terminal connection.

Hardware Specifications

Parameter	Specification
Model	TU818 3BSE069209R1
Base Model	TU818
Brand	ABB
Product Type	Compact Module Termination Unit
Series	S800 I/O
Origin	Sweden
Weight	0.2 kg
Dimensions	Estimated shipping size: 17 x 6.4 x 6.3 cm
Channels	32
Rated Voltage	50 V
Connection	Terminal block
Process Connections	40 pole screw terminal
Mounting	Both directions
I/O Configuration	Single
Type	Compact
Function	Field wiring termination and ModuleBus distribution
ModuleBus	Integrated within the MTU
Mechanical Keys	2 keys, 6 positions each
Key Configurations	36 mechanical configurations
Tariff Code	8537101190

ABB S800 ModuleBus and Termination Characteristics

The TU818 operates as a passive interface between field wiring and an S800 I/O module. It terminates up to 32 signal channels and distributes the ModuleBus to the connected I/O module and the following MTU.

Furthermore, the MTU generates the required I/O module address by shifting outgoing position signals toward the next MTU. Therefore, the physical MTU position participates in the ModuleBus addressing arrangement.

Two mechanical keys configure the TU818 for different I/O module types. Each key provides six selectable positions, producing 36 possible mechanical configurations. This keying mechanism provides physical configuration control and does not change the electrical functionality of the MTU or connected I/O module.

The supplied data identifies the TU818 as a single I/O configuration unit with a 50 V rating. No Profinet, EtherNet/IP, firmware, or communication-speed specification is provided for this passive termination unit.

Frequently Asked Questions (FAQ)

Q: Is the TU818 an active I/O module?

A: No. The TU818 is a passive Module Termination Unit. It provides field-wiring termination and ModuleBus distribution rather than performing active signal processing.

Q: How many signal channels does the TU818 support?

A: The TU818 provides 32 signal channels and uses a 40 pole screw terminal for process connections.

Q: What is the purpose of the two mechanical keys?

A: The two keys configure the MTU for different I/O module types. Each key has six positions, resulting in 36 mechanical configuration combinations.

Field Installation Guidelines

1. Confirm the TU818 part number and the intended S800 I/O module configuration before installation.
2. Set the two mechanical keys according to the applicable I/O module configuration.
3. Mount the MTU in the permitted orientation and secure it mechanically before terminating field wiring.
4. Connect field conductors to the 40 pole screw terminal according to the approved system wiring diagram.
5. Maintain clear separation between signal wiring and power or high-noise conductors where the installation design requires it.
6. Route cable shields and protective earth connections according to the applicable plant grounding standard.
7. Verify conductor identification, terminal assignment, polarity, and continuity before energizing the I/O system.
8. Confirm that the ModuleBus connection passes correctly to the I/O module and onward to the next MTU.
9. Do not apply operating-temperature or power-consumption limits that are not stated in the applicable ABB documentation.

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