Overview
The ABB TU818 3BSE069209R1, also cataloged as the TU818 Compact Module Termination Unit, operates as a passive field wiring interface component for signal connection and ModuleBus distribution within the ABB S800 I/O system.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | TU818 3BSE069209R1 |
| Brand | ABB |
| Product Type | Compact Module Termination Unit (MTU) |
| Series | S800 I/O |
| Origin | Sweden |
| Weight | 0.2 kg |
| Dimensions | 17 x 6.4 x 6.3 cm (shipping size) |
| Operating Temp | Not specified |
| Power Consumption | Passive unit, no external power consumption |
| Connection Type | Terminal block |
| Field Connection | 40 pole screw terminal |
| Number of Channels | 32 |
| Voltage Rating | 50 V |
| Mounting Direction | Both directions |
| I/O Configuration | Single I/O |
| ModuleBus Function | ModuleBus distribution and address generation |
| Mounting Type | Compact MTU design |
Backplane Bus Communication and I/O Density Scaling
The ABB TU818 3BSE069209R1 supports S800 I/O module installation by distributing the ModuleBus signal between the connected I/O module and the following MTU position. The unit generates the correct module address by shifting outgoing position signals through the ModuleBus chain.
The TU818 uses two mechanical keys to configure compatibility with different S800 I/O module types. Each key provides six positions, creating 36 possible mechanical configurations. This coding system prevents incorrect physical installation while maintaining passive electrical operation.
The compact termination design supports high I/O density scaling in control cabinets by providing a direct interface between field wiring and S800 I/O modules. The unit does not process field signals and does not include active electronic components.
Frequently Asked Questions
Q: Does the TU818 3BSE069209R1 process analog or digital field signals?
A: No. The TU818 is a passive Module Termination Unit. It only provides field wiring termination, ModuleBus distribution, and mechanical configuration functions.
Q: Can the TU818 support redundant I/O configurations?
A: No. The specified TU818 configuration supports single I/O connection only.
Q: Does the TU818 require an external power supply?
A: No. The MTU is a passive connection unit and does not require independent power input.
Field Installation Guidelines
- Install the TU818 according to the ABB S800 I/O system mechanical configuration requirements.
- Verify that the mechanical key positions match the connected I/O module before mounting.
- Connect field wiring to the 40 pole screw terminal according to the approved cabinet wiring diagram.
- Separate field signal cables from high-voltage power cables to reduce electrical interference.
- Apply appropriate grounding practices for cable shields based on the control system installation standard.
- Confirm ModuleBus continuity after completing MTU installation and cabinet wiring.
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