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ABB TU847 Module Termination Unit

The ABB TU847 3BSE022462R1, also cataloged as the TU847 Module Termination Unit, provides physical and electrical connection management for redundant CI840/CI840A field communication interface configurations within ABB System 800xA ModuleBus networks.

Hardware Specifications

Parameter	Specification
Model	TU847 3BSE022462R1
Brand	ABB
Product Type	Module Termination Units
Origin	Sweden
Weight	0.5 kg (1.1 lbs)
Dimensions	Width 124 mm, Height 186 mm including latch, Depth 47 mm
Operating Temp	0 to +55 deg C (approved range +5 to +55 deg C)
Power Consumption	24 VDC input, ModuleBus distribution maximum 5 V 1.5 A and 24 V 1.5 A
Communication Protocol	PROFIBUS DP-V1
Configuration Type	Redundant CI840/CI840A, Single I/O
Module Redundancy	Yes
Hot Swap Support	No
Power Input	24 VDC (19.2 to 30 V)
Mounting Orientation	Vertical or Horizontal
Connector Interface	PROFIBUS DSUB9 connector, Service ports RJ45 connector
Mechanical Key Configuration	36 different combinations
Rated Insulation Voltage	50 V
Dielectric Test Voltage	500 VAC
Protection Class	IP20 according to IEC 529
Relative Humidity	5 to 95 %, non-condensing
Storage Temperature	-40 to +70 deg C
Equipment Class	Class I according to IEC 60536, earth protected
Certifications	CE, EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201
Hazardous Location Approval	cULus Hazardous Location Class 1 Zone 2, ATEX Zone 2
Marine Certificates	ABS, BV, DNV-GL, LR

ABB ModuleBus Redundant Communication Interface

The TU847 uses ABB ModuleBus architecture to connect two CI840/CI840A communication interface modules in a redundant arrangement. The unit provides dual module positions, dual rotary switches for station address settings from 0 to 99, and electrical ModuleBus connections for distributed I/O communication.

The mechanical key system prevents incorrect module installation. Each position uses two six-position keys, creating 36 configuration combinations for module identification control.

The TU847 supports connection of a ModuleBus Optical Port TB842 through the TB806 adapter. Therefore, optical ModuleBus extension capability can be integrated into the same hardware configuration.

Backplane Bus Communication and I/O Density Scaling

The TU847 operates as a passive connection unit within ABB industrial control platforms. It maintains electrical routing between CI840/CI840A interfaces and the ModuleBus network while supporting redundant communication paths.

The unit applies ABB backplane bus communication architecture for I/O density scaling across System 800xA installations. Additionally, the fixed ModuleBus current distribution limits define the available power capacity for connected communication modules.

Frequently Asked Questions

Q: Does the TU847 support hot swap replacement during system operation?
A: No. The TU847 cannot be replaced with power applied. The system power must be removed before mechanical replacement.

Q: Can the TU847 operate with redundant CI840 and CI840A modules?
A: Yes. The TU847 is designed for redundant CI840/CI840A communication interface configurations with two module positions.

Q: What installation clearance is required for TU847 removal?
A: The TU847 requires available space on the left side to allow removal from the mounting arrangement.

Field Installation Guidelines

• Install the TU847 in a vertical or horizontal mounting position according to cabinet layout requirements.
• Verify that power is disconnected before removing or replacing the unit.
• Confirm mechanical key positions before inserting CI840/CI840A modules.
• Route PROFIBUS cables separately from high-voltage power conductors to reduce electrical interference.
• Use approved wire sizes from 0.25 to 2.5 mm2 with recommended terminal torque of 0.5 to 0.6 Nm.
• Maintain proper protective earth connection according to the equipment Class I installation requirements.
• Check ModuleBus connections and station address settings before commissioning.
• Ensure environmental conditions remain within the specified operating temperature and humidity limits.

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