TB20-C, bus coupler

TB20-C, Buskoppler EtherCATTB20-C, Buskoppler EtherCAT Front
TB20-C, Buskoppler EtherCAT
TB20-C, Buskoppler EtherCAT Front


The EtherCAT bus coupler makes it possible to access data from peripheral modules using the EtherCAT protocol.
It can accommodate up to 64 modules of any kind connected in series with the bus coupler.
It detects peripheral modules that are plugged in and can assign the corresponding I/O data to an EtherCAT mapping automatically.
The EtherCAT bus coupler supports the Modular Device Profile.
A large I/O image table size of 1,024 bytes makes it possible toimplement 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.
Alternatively, the configuration can also be edited using the CoE object dictionary.
Finally, running TB20 systems can be diagnosed in real-time and set up for testing purposes if an EtherCAT master is not yet connected (simulation / I/O check).
A functioning TB20 configuration will always require a bus coupler and at least one peripheral module.

Note: Individual modules cannot be combined with the IO systems of other manufacturers.

  • EtherCAT slave with Modular Device Profile (MDP) support
  • Two EtherCAT ports (RJ45, 100BASE-TX)
  • Up to 64 peripheral modules
  • Modules can be replaced during operation (hot-swap)
  • Automatic module I/O data mapping
  • 1024 bytes of input data; 1024 bytes of output data
  • 24 V DC power supply
  • Integrated power supply unit for powering peripheral modules (2.5 A)
  • Supplies the system’s I/O voltage (24 V DC)
  • 5 LEDs used as indicators for the current coupler, EtherCAT, and the link/activity status
  • USB device port for online diagnostics, configuring parameters, setup, and firmware updates with "TB20 ToolBox"
  • Can be alternatively configured, including its parameters, using the CoE protocol
  • TB20 ToolBox simulation for setting up the I/O system without a higher-level controller in order to test the system's operation (I/O check)
  • Concealed "factory reset" switch for restoring the module to its factory settings
Download PDF datasheet
General information
Order number600-185-1AA11
Article nameTB20-C, EtherCAT bus coupler
Scope of deliveryBus coupler EtherCAT, 24 V power supply connector, bus cover element, base module
Dimensions (DxWxH)73 x 35 x 110 mm
WeightApprox. 130 g
EtherCAT interface
ProtocolEtherCAT according to IEC standard 61158
Physical layerEthernet
Transmission rate100 Mbps, full duplex
I/O image size1024 bytes respectively
FeaturesAutomatic process data configuration, Support of 'CANopen over EtherCAT' (CoE), Object directory according to 'Modular Device Profile' (MDP), Support of 'SDO Info' and 'Complete Access'
Diagnostic functionscycle-current module diagnosis on the basis of module and channel status, subsequent module diagnosis on the basis of the diagnosis status in the object directory
USB interface
ProtocolFull-speed USB 1.1 device
Isolation voltage1.5 kV
Electrical isolationYes
Number of modules that can be connected in series64
Voltage supply24 V DC, 18...28 V DC
Ambient conditions
Ambient temperature0 °C … +60 °C
Transport and storage temperature-20 °C … +80 °C
Relative air humidity95 % r H without condensation
Pollution degree2
Protection ratingIP 20
CertificationsCE, UL pending
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 – EtherCAT® Buskoppler, Manual 2 7 MBTB20, EtherCAT, Buskoppler, Manual
EU Declaration of Confirmity 04-2020 55 KBEU Declaration of Confirmity


Flyer, TB20 IO-system for numerous applications 08-2022 6 MBTB20 IO-system for numerous applications


TB20, ESI File for EtherCAT bus coupler 1.06.004 74 KBTB20, ESI File for EtherCAT bus coupler
TB20-ToolBox V2 Setup V2.10.008 29 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 EtherCAT, STEP Files 3 MBTB20-C, Buskoppler EtherCAT, 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.