TU838 ABB Extended Module Termination Unit
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Product’s description
The ABB TU838 is a Module Termination Unit (MTU) in the ABB S800 I/O system. It provides the physical interface and termination for I/O modules in distributed/ modular control systems.
It supports up to 16 I/O channels for field-signal termination.The TU838 distributes the ModuleBus signal to the attached I/O module and passes the address/position shift
to the next MTU in the chain. This means it acts not just as a passive terminal block
but also part of the bus addressing architecture.
Frequently Asked Questions About TU838
Q1: What exactly does the TU838 do in an S800 I/O system?
A: The TU838 acts as the termination and interface unit for one I/O device (one MTU plus one I/O module) in the S800 I/O system. It provides the field-signal connections, fused power
outlets, process-power terminals, the ModuleBus connection to the I/O module, and also propagates the addressing (position) to the next MTU in the chain.
Q2: How many I/O channels can it handle, and what are the electrical limits?
A: It supports up to 16 I/O channels. The maximum rated voltage is 50 V, and the maximum current per channel is 3 A.
Q3: What kind of field wiring or power outlets does the TU838 provide?
A: It gives fused transducer power outlets (for example 2 × 4 fused sensor power outlets), process-power
terminals, and signal terminals. Two channels may share one fused transducer power terminal
in some configurations. Process power may be connected to two
individually isolated groups (if the I/O module supports it).
Q4: Can I mix different types of I/O modules with the TU838?
A: Yes, the TU838 is designed to host different kinds of I/O modules (analog, digital)
within the S800 I/O system. The mechanical keying helps ensure the
correct module is inserted. However you must ensure compatibility
of the I/O module with the MTU’s channel count,
power distribution and field
wiring.
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