The TU840 is a module termination unit (MTU) for redundant configuration of Optical ModuleBus Modem TB840/TB840A.
The MTU is a passive unit having connections for power supply, double electrical ModuleBus, two TB840/TB840A and a rotary switch for cluster address (1 to 7) setting.
Four mechanical keys, two for each position, are used to configured the MTU for the right types of modules. Each key has six positions, which gives a total number of 36 different configurations. The configurations can be changed with a screwdriver.
Termination Unit TU840 connects TB840/TB840A to redundant I/O. Termination Unit TU841 connects TB840/TB840A to non-redundant I/O.
Features and Benefits
A rotary switch for cluster address setting
Mechanical keying prevents insertion of wrong module type
Double ModuleBus connection
Latching device to DIN rail for locking and grounding
DIN rail mounted
Article number
3BSE020846R1
Communication protocol
Modulebus
Master or slave
N/A
Line redundancy
Yes
Module redundancy
Yes
Hot Swap
No
Type
Redundant TB840/TB840A, Redundant I/O, Single Power