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ABB TU834 Extended Module Termination Unit

Configured for direct field wiring and ModuleBus distribution in ABB S800 I/O systems, the ABB TU834 3BSE040364R1 (TU834 Module Termination Unit) provides physical terminal interfaces for up to 8 I/O channels and process voltage connections. Each channel provides two I/O connections and one ZP connection. The MTU also shifts outgoing position signals to generate the correct address for the next I/O module.

Hardware Specifications

Parameter	Specification
Model	TU834
Article Number	3BSE040364R1
Brand	ABB
Product Type	Extended Module Termination Unit
Configuration	Single I/O
Connection	Terminal block
Channels	8
Maximum Rated Voltage	50 V
Maximum Current per I/O Channel	2 A
Maximum Current per Process Connection	5 A
Process Connections	40 total
I/O Connections	Up to 8 I/O channels, 2 terminals per channel
Process Power Connections	4
Process Power 0 V Connections	20
ZP Connection	1 per channel
Input Signal Connection	Individual shunt sticks, TY801
ModuleBus Function	Distributes ModuleBus to the next MTU
Position Signal Function	Shifts outgoing position signals to the next MTU
Compatible I/O	AI880 and AI880A
Mounting	Standard DIN rail
Mounting Direction	Both directions
DIN Rail Locking	Mechanical latch
Weight	0.28 kg (0.6 lb)
Dimensions	126 mm W x 64 mm D x 110 mm H including connector, terminals, and locking device as specified
Installed Width	120.5 mm edge to edge
Operating Temperature	0 to +55 deg C (+32 to +131 deg F)
Storage Temperature	-40 to +70 deg C (-40 to +158 deg F)
Relative Humidity	5 to 95 %, non-condensing
Pollution Degree	Degree 2, IEC 60664-1
Protection Class	IP20 according to IEC 60529
Dielectric Test Voltage	500 V AC
Corrosion Protection	ISA-S71.04: G3
EMC	EN 61000-6-4, EN 61000-6-2
Electrical Safety	EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201
Hazardous Location	C1 Div 2 cULus, C1 Zone 2 cULus, ATEX Zone 2
Marine Certifications	ABS, BV, DNV-GL, LR
Equipment Class	Class I according to IEC 61140
RoHS	EN 50581:2012
WEEE	DIRECTIVE/2012/19/EU

ABB S800 I/O Interface and ModuleBus Function

The TU834 provides the physical connection between compatible ABB S800 I/O modules and field wiring. Each of its 8 channels has two I/O terminals and one ZP connection, while individual shunt sticks TY801 connect input signals.

The MTU also distributes the ModuleBus to the following MTU. At the same time, it shifts the outgoing position signals so that the next I/O module receives its required address position. Therefore, correct MTU sequencing and mechanical installation directly affect I/O module addressing.

The TU834 supports DIN-rail installation and uses a mechanical latch to secure the unit to the rail. Installers can mount the unit in either permitted direction according to the system assembly arrangement.

For industrial control installations, the specified I/O density allows multiple field channels to terminate through one compact MTU. However, each channel must remain within the stated 50 V maximum voltage and 2 A maximum current limits.

Frequently Asked Questions

Q: How many I/O channels does the ABB TU834 support?

A: The TU834 supports up to 8 I/O channels. Each channel provides two I/O connections and one ZP connection.

Q: What is the maximum electrical rating for each I/O channel?

A: The maximum rated voltage is 50 V, while the maximum current is 2 A per I/O channel. The maximum current for a process connection is 5 A.

Q: How does the TU834 handle ModuleBus and I/O addressing?

A: The MTU distributes ModuleBus to the next MTU and shifts outgoing position signals to generate the correct address position for the next I/O module.

Field Installation Guidelines

1. Mount the TU834 on a compatible standard DIN rail and engage the mechanical locking latch fully.
2. Verify the mounting direction and maintain the required physical arrangement of adjacent S800 I/O components.
3. Connect field wiring through the designated terminal connections and use TY801 shunt sticks for the specified input signal connections.
4. Keep each I/O channel within the 50 V maximum voltage and 2 A maximum current ratings.
5. Keep process connection loading within the specified 5 A maximum current.
6. Use compatible conductor sizes: 0.2 - 4 mm2 for solid conductors or 0.2 - 2.5 mm2 for stranded conductors.
7. Apply the specified terminal torque of 0.5 - 0.6 Nm and strip approximately 7 mm of insulation.
8. Route signal wiring separately from high-energy power conductors where the installation environment requires noise reduction.
9. Verify terminal identification before energizing the I/O circuit.
10. Inspect the ModuleBus path and adjacent MTU sequence before commissioning to ensure correct position signal propagation and I/O addressing.
11. Confirm the installation environment remains within the specified operating temperature, humidity, pollution, and IP20 conditions.
12. Connect protective earth according to the applicable system installation requirements and the Class I equipment classification.

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