TB20-C, bus coupler

TB20-C, Buskoppler EtherNet/IPTB20-C, Buskoppler EtherNet/IP Frontal
TB20-C, Buskoppler EtherNet/IP
TB20-C, Buskoppler EtherNet/IP Frontal


The EtherNet/IP bus coupler makes it possible to access data from peripheral modules using the EtherNet/IP protocol. It can accommodate up to 64 modules of any kind connected in series with the bus coupler.
The EtherNet/IP bus coupler features an integrated two-port switch that allows for star and line topology configurations. 
A large I/O image table size of one kbyte makes it possible to implement comprehensive and complex systems.
TB20 ToolBox can be used to easily configure the system and the various module parameters and transfer the corresponding settings to the coupler.
A functioning TB20 configuration will always require a bus coupler and at least one peripheral module. The bus coupler supports hot-swapping for replacing modules during operation.

  • Modules can be replaced during operation (hot-swapping)
  • 24 V DC power supply 
  • Integrated power supply unit for powering peripheral modules (2.5 A) 
  • Supplies the system’s I/O voltage (24 VDC) 
  • USB device port for online diagnostics, configuring parameters, setup, and firmware updates with "TB20 ToolBox"
  • TB20 ToolBox simulation for commissioning the I/O system without a higher-level controller in order to test the functionality (I/O check)
  • Concealed "factory reset" switch for restoring the module to its factory settings
  • Supports unicast and multicast 
  • CIP connections
  • 511 bytes of input assembly data, 511 bytes of output assembly data
  • TB20 ToolBox can be used for easy access to assembly sizes and to the structure of the memory image within the assemblies
  • Up to 64 peripheral modules
  • Implicit messaging (transport class 1)
  • Explicit messaging (transport class 3)
  • TCP watchdog
  • IP address can be set relative to a base IP address by using a DIP switch that can be covered
  • DHCP (can be selected using DIP switch)
  • Integrated 2-port switch with 2 x RJ45 connectors
  • Module process data is automatically assigned to the EtherNet/IP mapping
Download PDF datasheet
General information
Order number600-175-1AA11
Article nameTB20-C, EtherNet/IP bus coupler
Scope of deliveryBus coupler Ethernet/IP, 24 V power supply connector, bus cover element, base module
Dimensions (DxWxH)73 x 35 x 110 mm
WeightApprox. 115 g
EtherNet/IP interface
Protocol transmission modelImplicit messaging (transport class 1), explicit messaging (transport class 3)
Transmission rate10/100 Mbps, automatic detection
Input/output assembly size511/511 bytes
IP addressCan be set with software and/or DIP switch
DHCPYes, can be selected using DIP switch
USB interface
ProtocolFull-speed USB 1.1 device
Isolation voltageYes
Electrical isolation1.5 kV
Number of modules that can be connected in series64
Voltage supply24 VDC, 18–28 VDC
Current draw
Current draw without modules (internal)75 mA
Power supply for modules5 V DC, max 2.5 A
Power dissipationMax. 8 W
Permissible cable cross-sectionAWG 16 .. 22
Mounting positionAny
Ambient conditions
Ambient temperature0 °C … +60 °C
Transport and storage temperature-20 °C … +80 °C
Relative air humidity95 % r H without condensation
Protection ratingIP 20
CertificationsCE, UL
Surrounding Air Temperature0 °C … +50 °C
Pollution degree2
Noise immunityDIN EN 61000-6-2 “EMC Immunity”
Interference emissionDIN EN 61000-6-4 “EMC Emission”
Vibration and shock resistanceDIN EN 60068-2-6:2008 „Vibration“, DIN EN 60068-2-27:2010 „Shock"

Technical Documentation

TB20, Manual EtherNet/IP Bus Coupler 3 9 MBTB20, Manual EtherNet/IP Bus Coupler
EU Declaration of Confirmity 04-2020 55 KBEU Declaration of Confirmity


Flyer, TB20 IO-system for numerous applications 11-2017 4 MBTB20 IO-system for numerous applications


TB20, EDS file for EtherNet/IP Bus Coupler 1.1 3 KB
TB20-ToolBox V2 Setup V2.10.006 28 MB History TB20-ToolBox, TB20, Toolbox


TB20, USB Driver 1.20 7 KBTB20, USB Driver

Planning Tools

TB20, Macros for EPLAN Electric P8* from V2.0 in EDZ format 07.02.2018 84 MB
TB20, STEP files 1.00 8 MB
TB20-C, Buskoppler EtherNet/IP, STEP Files 3 MBTB20-C, Buskoppler EtherNet/IP, STEP Files

The 24 V power supply connector, the bus cover element, and the base module are included as standard.

“TB20 ToolBox” makes it easy to plan the system. Integrated terminal mapping, system width calculations, and current-carrying capacity monitoring all make it possible to quickly design systems without making any mistakes.