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ABB TU831V1 Extended Module Termination Unit

Configured for field termination and ModuleBus distribution in the ABB S800 I/O system, the ABB TU831V1 3BSE013235R1 (TU831V1 Extended Module Termination Unit) provides physical connections for compatible digital I/O modules. It supports up to 8 I/O channels, with a maximum rated voltage of 250 V and maximum current of 3 A per channel.

Hardware Specifications

Parameter	Specification
Model	TU831V1
Article Number	3BSE013235R1
Brand	ABB
Product Type	Extended Module Termination Unit
Series	S800 I/O
Origin	Not specified in supplied data
Weight	0.22 kg (0.48 lbs)
Dimensions	126 mm W x 64 mm D x 110 mm H
Installed Width	120.5 mm edge to edge
Channels	Up to 8 I/O channels
Process Connections	16 terminals, 2 terminals per channel
Maximum Rated Voltage	250 V
Maximum Current per I/O Channel	3 A
Connection	Terminal block
I/O Configuration	Single
Compatible I/O Modules	DI820, DI821, DO820, DO821
Mounting	Standard DIN rail
Mounting Direction	Both directions
ModuleBus Distribution	To the I/O module and next MTU
Address Generation	Position signal shifting to the next MTU
Wire Size, Solid	0.2 - 6 mm2
Wire Size, Stranded	0.2 - 4 mm2, 24 - 10 AWG
Recommended Terminal Torque	0.5 - 0.6 Nm
Wire Stripping Length	7 mm
Dielectric Test Voltage	2000 V AC
Operating Temperature	0 to +55 deg C (+32 to +131 deg F)
Approved Operating Temperature	+5 to +55 deg C
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
Corrosion Protection	ISA-S71.04: G3
Protection Class	IP20 according to IEC 60529
Mechanical Conditions	IEC/EN 61131-2
EMC	EN 61000-6-4, EN 61000-6-2
Overvoltage Categories	IEC/EN 60664-1, EN 50178
Equipment Class	Class I according to IEC 61140
CE Mark	Yes
Electrical Safety	EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201
Marine Certifications	ABS, BV, DNV-GL, LR
RoHS	EN 50581:2012
WEEE	Directive 2012/19/EU

ABB S800 I/O ModuleBus and I/O Density

The TU831V1 distributes the ModuleBus from the mounted I/O module toward the next MTU. It also shifts outgoing position signals so the following MTU receives the corresponding module address position.

The eight-channel configuration provides a compact termination arrangement for compatible S800 I/O modules. Each channel uses two process terminals, giving 16 process connections for the complete eight-channel arrangement.

The MTU does not function as an independent I/O processing module. Instead, it provides the mechanical, electrical, termination, and ModuleBus interface required by the supported I/O modules. Therefore, module compatibility must be checked before installation.

Frequently Asked Questions

Q: How many I/O channels does the ABB TU831V1 support?
A: The TU831V1 supports up to 8 I/O channels and provides 16 process connections, with two terminals assigned to each channel.

Q: What I/O modules are specified for use with the TU831V1?
A: The supplied data identifies DI820, DI821, DO820, and DO821 as compatible I/O modules.

Q: What is the maximum electrical rating per I/O channel?
A: Each I/O channel has a maximum rated voltage of 250 V and a maximum current rating of 3 A.

Field Installation Guidelines

• Mount the TU831V1 on a suitable standard DIN rail and engage the mechanical latch fully.
• Verify the MTU orientation and terminal accessibility before connecting field wiring.
• Confirm that the selected I/O module is one of the specified compatible types.
• Keep field wiring separated from high-energy switching conductors where the installation requires signal-noise control.
• Route signal wiring to minimize unnecessary parallel runs with power conductors.
• Use conductor sizes within the specified 0.2 - 6 mm2 solid or 0.2 - 4 mm2 stranded range.
• Apply the specified 0.5 - 0.6 Nm terminal torque during wiring.
• Strip approximately 7 mm of insulation from conductors before termination.
• Verify protective earth arrangements according to the applicable installation standard because the equipment is Class I.
• Inspect terminal connections before energization and verify that no conductor strands contact adjacent terminals.
• Confirm the ModuleBus path and MTU position before commissioning the connected I/O module.
• Do not exceed the specified 250 V maximum voltage or 3 A maximum current per I/O channel.
• Maintain the specified environmental limits during installation and operation.

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