ABB TU838 3BSE008572R1 Module Termination Unit

ABB TU838 3BSE008572R1 Module Termination Unit 

Functional Description

The TU838 MTU can have up to 16 I/O channels. The maximum rated voltage is 50 V and maximum rated

current is 3 A per channel.

The MTU distributes the ModuleBus to the I/O module and to the next MTU. It also generates the correct

address to the I/O module by shifting the outgoing position signals to the next MTU.

The MTU can be mounted on a standard DIN rail. It has a mechanical latch that locks the MTU to the DIN rail.

Two mechanical keys are used to configure the MTU for different types of I/O modules. This is only a

mechanical configuration and it does not affect the functionality of the MTU or the I/O module. Each key has

six positions, which gives a total number of 36 different configurations.

Features and benefits

· Complete installation of I/O modules using 3-wire connections, fuses and field power distribution.

· Up to 16 channels of field signals and 8 process power connections.

· Two channels share one fused transducer power terminal.

· Process voltage can be connected to 2 individually isolated groups, if the I/O module supports it.

· Connections to ModuleBus and I/O modules.

· Mechanical keying prevents insertion of the wrong I/O module.

· Latching device to DIN rail for grounding.

· DIN rail mounting.

Technical Specifications