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ABB TU844 3BSE021445R1 Redundant Module Termination Unit

The ABB TU844 3BSE021445R1, also cataloged as the TU844 Redundant Module Termination Unit, provides physical signal termination and ModuleBus distribution for ABB S800 I/O modules including AI845, AI880, AI880A, and DP840 configurations.

Hardware Specifications

Parameter	Specification
Model	TU844 3BSE021445R1
Brand	ABB
Product Type	Redundant Module Termination Unit (MTU)
Origin	Sweden
Weight	0.6 kg (1.3 lbs)
Dimensions	Width: 131 mm including connector; Depth: 64 mm including terminals; Height: 186.5 mm including locking device
Operating Temp	0 to +55 deg C (+32 to +131 deg F)
Power Consumption	Passive MTU design; power consumption generated by connected I/O modules
Configuration Type	Redundant
Connection Type	Terminal block
I/O Channels	8
Process Voltage Connections	2 + 2 process voltage connections
Maximum Voltage Rating	50 V per channel
Maximum Current Rating	2 A per I/O channel
Maximum Process Connection Current	5 A
Compatible I/O Modules	AI845, AI880, AI880A, DP840
Mounting Method	Horizontal DIN rail mounting
ModuleBus Distribution	Dual ModuleBus distribution to I/O module and next MTU
Input Selection	Voltage or current input selection through TY801 shunt sticks
Dielectric Test Voltage	500 V AC
Wire Size	Solid: 0.2 - 4 mm2; Stranded: 0.2 - 2.5 mm2, 24 - 12 AWG
Recommended Terminal Torque	0.5 - 0.6 Nm
Wire Stripping Length	7 mm
Protection Class	IP20 according to IEC 60529
Relative Humidity	5 to 95 %, non-condensing
Storage Temperature	-40 to +70 deg C (-40 to +158 deg F)
Pollution Degree	Degree 2, IEC 60664-1
Corrosion Protection	ISA-S71.04 G3
EMC Compliance	EN 61000-6-4, EN 61000-6-2
Electrical Safety Standards	EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201
Hazardous Location Certification	C1 Div 2 cULus, C1 Zone 2 cULus, ATEX Zone 2
Marine Certification	ABS, BV, DNV-GL, LR
RoHS Compliance	EN 50581:2012
WEEE Compliance	Directive 2012/19/EU

ABB S800 I/O ModuleBus Signal Distribution

The TU844 provides electrical termination and routing functions for redundant ABB S800 I/O installations. It distributes two ModuleBuses, with one bus assigned to each I/O module and the outgoing connection extended to the next MTU.

The unit generates module addressing by shifting outgoing position signals through the MTU chain. Therefore, connected I/O modules receive the correct hardware position information without additional software configuration.

The TU844 supports eight I/O channels, where each channel contains two I/O terminals and one ZP connection. Additionally, TY801 individual shunt sticks define the input mode between voltage and current signals. The channel design supports a maximum rated voltage of 50 V and a maximum rated current of 2 A.

The mechanical key system configures compatibility between the MTU and installed I/O modules. Each I/O module position uses two mechanical keys, and each key provides six positions. Therefore, the configuration system supports 36 possible mechanical combinations without changing electrical functionality.

Frequently Asked Questions

Q: What I/O modules can be connected to the ABB TU844 3BSE021445R1?

A: The TU844 supports ABB S800 I/O modules including AI845, AI880, AI880A, and DP840 modules in redundant configurations.

Q: How does the TU844 select voltage or current input signals?

A: The input selection is performed through individual TY801 shunt sticks. The shunt stick defines whether the channel operates with voltage or current input signals.

Q: Can the TU844 be installed on a standard DIN rail?

A: Yes. The TU844 uses horizontal DIN rail mounting and includes a mechanical latch that locks the MTU to the rail.

Field Installation Guidelines

• Install the TU844 on a standard DIN rail with the locking mechanism fully engaged before wiring.
• Verify that the mechanical key positions match the installed ABB S800 I/O module type before commissioning.
• Use approved terminal wiring methods and maintain correct conductor preparation according to the specified wire range.
• Separate signal wiring from high-current power cables to reduce electrical interference.
• Connect cable shields according to the plant grounding standard when shielded instrumentation wiring is used.
• Confirm TY801 shunt stick positions before applying field signals to prevent incorrect voltage or current input configuration.
• Inspect ModuleBus connections between adjacent MTUs before system power-up.
• Maintain environmental limits for temperature, humidity, pollution degree, and enclosure protection during installation.

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