ABB TBU838 Extended Module Termination Unit

The TU838 MTU supports up to 16 I/O channels with a maximum rated voltage of 50 V and a maximum rated current of 3 A per channel. It distributes the ModuleBus signal to both the connected I/O module and the next MTU in the chain. Additionally, it generates the correct address for each I/O module by shifting outgoing position signals to subsequent MTUs.

The MTU is designed for easy installation on a standard DIN rail and features a mechanical latch that securely locks the unit in place.

Configuration

Two mechanical keys configure the MTU for various types of I/O modules. This configuration is purely mechanical and does not affect the functionality of the MTU or the I/O module. Each key has six positions, allowing for a total of 36 different configurations.

Features and Benefits

• Complete installation of I/O modules with 3-wire connections, integrated fuses, and field power distribution.

• Supports up to 16 field signal channels and 8 process power connections.

• Two channels share one fused transducer power terminal.

• Process voltage can be connected to two individually isolated groups, if supported by the I/O module.

• Connections available for ModuleBus and I/O modules.

• Mechanical keying prevents incorrect insertion of I/O modules.

• Includes a latching device for secure mounting and grounding on DIN rails.

• Designed for easy DIN rail mounting.