The TU842 MTU can have up to 16 I/O channels and 2+2 process

voltage connections. Each channel has two I/O connections and one

ZP connection. The maximum rated voltage is 50 V and maximum

rated current is 3 A per channel.

The MTU distributes the two ModuleBuses to each I/O module and to

the next MTU. It also generates the correct address to the I/O

modules 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.

Four mechanical keys, two for each I/O module, 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.