ABB TU849 3BSE042560R1 Module Termination Unit The ABB TU849 3BSE042560R1, also cataloged as the TU849 Module Termination Unit, provides physical...
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ABB TU849 3BSE042560R1 Module Termination Unit
The ABB TU849 3BSE042560R1, also cataloged as the TU849 Module Termination Unit, provides physical termination and power distribution for redundant TB840/TB840A Optical ModuleBus Modem configurations within ABB ModuleBus networks.
Hardware Specifications
Parameter
Specification
Model
TU849 3BSE042560R1
Brand
ABB
Origin
Sweden
Product Type
Module Termination Unit (MTU)
Communication Protocol
ModuleBus
Configuration Type
Redundant TB840/TB840A, Single I/O, Dual Power
Power Input
24 VDC (19.2 to 30 V)
Weight
0.45 kg
Dimensions
124 mm W x 186.5 mm H x 47 mm D
Mounting
Vertical or Horizontal DIN rail mounting
Operating Temp
0 to +55 deg C (approved range +5 to +55 deg C)
Storage Temperature
-40 to +70 deg C
Power Consumption
2.5 W
ModuleBus Current Distribution
Maximum 5 V 1.5 A and 24 V 1.5 A
Line Redundancy
Yes
Hot Swap Support
No
Mechanical Key Configurations
36 selectable combinations
Rated Insulation Voltage
50 V
Dielectric Test Voltage
500 VAC
Protection Class
IP20 according to IEC 60529
Relative Humidity
5 to 95 %, non-condensing
Wire Size Range
Solid and stranded 0.2 to 2.5 mm2, 24 to 12 AWG
Recommended Terminal Torque
0.5 Nm
ABB ModuleBus Redundant Power and I/O Interface Design
The TU849 uses passive electrical routing to connect two TB840/TB840A Optical ModuleBus Modems with individual power supply inputs. The unit provides one electrical ModuleBus connection and supports redundant modem installation for non-redundant I/O configurations.
Furthermore, the MTU integrates a rotary switch for cluster address selection from 1 to 7. Four mechanical keys define module compatibility through 36 selectable hardware configurations. The key positions can be adjusted with a screwdriver to match the installed modem arrangement.
For ABB industrial control platforms, the TU849 supports ModuleBus communication structures where backplane bus communication velocity and I/O density scaling depend on the connected controller and I/O architecture. The passive termination design maintains direct signal routing without internal processing functions.
Frequently Asked Questions
Q: Does the ABB TU849 support hot swap replacement of TB840/TB840A modules? A: No. The TU849 does not provide hot swap capability. Power isolation and system shutdown procedures should be followed before replacing connected modem modules.
Q: What type of power connection does the TU849 provide for redundant modem installation? A: The TU849 provides two separate power supply connections, with one connection assigned to each TB840/TB840A modem position.
Q: How are module compatibility settings configured on the TU849? A: The MTU uses four mechanical keys with six positions each. These settings provide 36 possible hardware configurations and can be adjusted using a screwdriver.
Field Installation Guidelines
Install the TU849 on a standard DIN rail using the integrated mechanical latch. Verify that the latch is correctly locked after mounting to prevent mechanical movement during operation.
Connect the 24 VDC power supply lines according to the assigned modem positions. Maintain correct polarity and separate power routing for each redundant modem connection.
Use approved industrial wiring practices when connecting ModuleBus and power conductors. Keep signal cables separated from high-voltage switching circuits to reduce electrical interference.
Before operation, verify the rotary switch cluster address setting and confirm that the mechanical key configuration matches the installed TB840/TB840A modem type.
