TB20-C, bus coupler

TB20-C, Buskoppler PROFINET IOTB20-C, Buskoppler PROFINET IO Front
TB20-C, Buskoppler PROFINET IO
TB20-C, Buskoppler PROFINET IO Front


The PROFINET bus coupler is designed to connect a PROFINET bus to TB20 peripheral modules. It can accommodate up to 63 modules of any kind connected in series with the bus coupler. The bus coupler supports hot-swapping for replacing modules during operation.
In addition, it will recognize all connected peripheral modules and assign each module the corresponding inputs/outputs from the process image table.
A functioning TB20 configuration will always require a bus coupler and at least one peripheral module.

  • 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 system's operation (I/O check)
  • Concealed "factory reset" switch for restoring the module to its factory settings
  • I/O device as per PROFINET IO (IEC 61158-6-10)
  • Integrated 2-port switch
  • Full-duplex transmission rate of 100 Mbps
  • 340 byte I/O data
  • Up to 63 peripheral modules
  • Conformance Class C
  • Media Redundancy Protocol (MRP)
  • Automatic addressing / hot-swapping (LLDP, DCP)
  • Topology detection
  • I&M data
  • Diagnostic alarms, process alarms, pull/plug alarms
  • Integration using GSDML file
  • 7 LEDs, one of them bi-color
Download PDF datasheet
General information
Order number600-180-1AA11
Article nameTB20-C, PROFINET IO bus coupler
Scope of deliveryBus coupler PROFINET IO, 24 V power supply connector, bus cover element, base module
Dimensions (DxWxH)73 x 35 x 110 mm
WeightApprox. 115 g
PROFINET interface
ProtocolPROFINET IO as defined in IEC 61158-6-10
Physical layerEthernet
Transmission rate100 Mbps full duplex
I/O image size340 bytes
integrated switchYes
FeaturesConformance Class C, Media Redundancy Protocol (MRP), automatic addressing / topology detection (LLDP, DCP), PTCP, statistics counter
Alarm functionsDiagnostic alarms, process alarms, pull/plug alarms
Minimum cycle time250 µsec.
IRT bridge delay< 3 µsec.
USB interface
ProtocolFull-speed USB 1.1 device
Isolation voltage1.5 kV
Electrical isolationYes
Number of modules that can be connected in series63
Voltage supply24 V DC, 18...28 V DC
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 PROFINET Coupler 4 8 MBTB20, Manual PROFINET 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, GSDML file for PROFINET Bus Coupler (from firmware version 1.02, please update your firmware) 20190319 45 KBTB20, GSDML file for PROFINET Bus Coupler (from firmware version 1.02, please update your firmware)
IPSet 1.04.016 23 MB History IPSet, IP Set
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 PROFINET IO, STEP Files 3 MBTB20-C, Buskoppler PROFINET IO, 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.