Description

ABB TB850 3BSC950193R1 CEX-Bus Terminator

The ABB TB850 3BSC950193R1, also cataloged as the TB850 CEX-Bus Terminator, provides direct electrical termination for CEX-Bus communication networks in ABB industrial control platforms. It applies a 120 ohm termination resistance through a 25-pin DB25P male connector interface to maintain bus signal integrity.

Hardware Specifications

Parameter	Specification
Model	TB850 3BSC950193R1
Brand	ABB
Product Type	CEX-Bus Terminator
Origin	Sweden
Weight	0.05 kg
Dimensions	6.5 x 2.5 x 4.2 cm
Operating Temp	-25 deg C to +70 deg C
Storage Temp	-40 deg C to +85 deg C
Power Consumption	Passive termination device, no external power required
Bus Interface	CEX-Bus
Termination Resistance	120 ohm
Bus Voltage	5 VDC
Connector Type	25-pin DB25P male connector
Cable Interface	9-pin D-sub connector or terminal block compatible interface
Humidity	5-95% RH, non-condensing
Pollution Degree	2
Tariff Code	8537101190

ABB Industrial Control Bus Signal Termination

The ABB TB850 supports CEX-Bus communication stability by providing the required end-of-line termination resistance. Therefore, the module reduces signal reflections on the communication line and maintains correct electrical characteristics across connected CEX-Bus segments.

For ABB PLC and DCS configurations, CEX-Bus communication depends on correct termination placement. The TB850 installs at the designated bus endpoint and works as a passive electrical component without firmware configuration or parameter settings.

Additionally, ABB control system installations require correct connector seating and cable routing to maintain communication performance. The termination resistor directly matches the bus impedance requirement of 120 ohm.

Frequently Asked Questions

Q: What is the primary function of the ABB TB850 3BSC950193R1?
A: The TB850 functions as a CEX-Bus terminator by providing a 120 ohm termination resistance at the communication bus endpoint.

Q: Does the TB850 require external power or firmware configuration?
A: No. The TB850 is a passive termination component and does not require external power, firmware loading, or software configuration.

Q: What installation consideration applies to the TB850 connection?
A: The installer should place the terminator at the correct CEX-Bus endpoint and verify proper connector engagement and cable shielding practices.

Field Installation Guidelines

• Install the TB850 only at the specified CEX-Bus termination position within the ABB control system configuration.
• Verify that the communication cable connection is fully seated before system startup.
• Maintain proper cable separation from high-voltage power wiring to reduce electromagnetic interference.
• Connect cable shields according to the ABB system grounding specification.
• Avoid mechanical stress on the DB25 connector during installation and maintenance operations.
• Confirm bus continuity and termination resistance before commissioning the communication network.

Specifications

• Brand: ABB

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems