The ABB TU818 is a 32-channel compact module termination unit (MTU) designed for S800 I/O systems. This passive unit facilitates field wiring connections to I/O modules and includes part of the ModuleBus functionality.
| Article Number | 3BSE069209R1 |
| Type | Compact |
| Connection | Terminal Block |
| Channels | 32 |
| Voltage | 50 V |
| Mounting | Both Directions |
| Mounting Detail | Horizontal: 55°C (131°F) Vertical: 40°C (104°F) |
| Process Connections | 40 Pole Screw Terminal |
| Single/Redundant I/O | Single |
| Compatible I/O Modules | AI810, AI815, AI835A, AI843, AI845, DI810, DI811, DI818, DI830, DI831, DI840, DI880, DI885, DO818, DP840 |
The MTU distributes the ModuleBus to the I/O module and subsequent MTUs while generating correct addresses for I/O modules by shifting outgoing position signals. Two mechanical keys with six positions each provide 36 different configurations for various I/O module types, ensuring proper mechanical alignment without affecting functionality.