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.

  • 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 number 600-185-1AA11
Article name TB20-C, EtherCAT bus coupler
Scope of delivery Bus coupler EtherCAT, 24 V power supply connector, bus cover element, base module
Dimensions (DxWxH) 73 x 35 x 110 mm
Weight Approx. 130 g
EtherCAT interface
Number 2
Protocol EtherCAT according to IEC standard 61158
Physical layer Ethernet
Transmission rate 100 Mbps, full duplex
I/O image size 1024 bytes respectively
Connection RJ-45
Features Automatic 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 functions cycle-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
Number 1
Protocol Full-speed USB 1.1 device
Connection Mini-USB
Isolation voltage 1.5 kV
Electrical isolation Yes
Number of modules that can be connected in series 64
Voltage supply 24 V DC, 18...28 V DC
Permissible cable cross-section AWG 16 .. 22
Ambient conditions
Ambient temperature 0 °C … +60 °C
Transport and storage temperature -20 °C … +80 °C
Relative air humidity 95 % r H without condensation
Pollution degree 2
Protection rating IP 20
Certifications CE, UL pending
Noise immunity DIN EN 61000-6-2 “EMC Immunity”
Interference emission DIN EN 61000-6-4 “EMC Emission”
Vibration and shock resistance DIN EN 60068-2-6:2008 „Vibration“, DIN EN 60068-2-27:2010 „Shock"
RoHS Yes

Technical Documentation

 Name Version Size Tags
TB20 – EtherCAT® Buskoppler, Manual 2 7 MB TB20, EtherCAT, Buskoppler, Manual
EU Declaration of Confirmity 04-2020 55 KB EU Declaration of Confirmity


 Name Version Size Tags
Flyer, TB20 IO-system for numerous applications 11-2017 4 MB TB20 IO-system for numerous applications


 Name Version Size Tags
TB20, ESI File for EtherCAT bus coupler 1.06.004 74 KB TB20, ESI File for EtherCAT bus coupler
TB20-ToolBox V2 Setup V2.10.006 28 MB History TB20-ToolBox, TB20, Toolbox


 Name Version Size Tags
TB20, USB Driver 1.20 7 KB TB20, USB Driver

Planning Tools

 Name Version Size Tags
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 MB TB20-C, Buskoppler EtherCAT, STEP Files

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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.