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 number 600-180-1AA11
Article name TB20-C, PROFINET IO bus coupler
Scope of delivery Bus coupler PROFINET IO, 24 V power supply connector, bus cover element, base module
Dimensions (DxWxH) 73 x 35 x 110 mm
Weight Approx. 115 g
PROFINET interface
Number 2
Protocol PROFINET IO as defined in IEC 61158-6-10
Physical layer Ethernet
Transmission rate 100 Mbps full duplex
I/O image size 340 bytes
Connection RJ45
integrated switch Yes
Features Conformance Class C, Media Redundancy Protocol (MRP), automatic addressing / topology detection (LLDP, DCP), PTCP, statistics counter
Alarm functions Diagnostic alarms, process alarms, pull/plug alarms
Minimum cycle time 250 µsec.
IRT bridge delay < 3 µsec.
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 63
Voltage supply 24 V DC, 18...28 V DC
Current draw
Current draw without modules (internal) 75 mA
Power supply for modules 5 V DC, max 2.5 A
Power dissipation Max. 8 W
Permissible cable cross-section AWG 16 .. 22
Mounting position Any
Ambient conditions
Ambient temperature 0 °C … +60 °C
Transport and storage temperature -20 °C … +80 °C
Relative air humidity 95 % r H without condensation
Protection rating IP 20
Certifications CE, UL
Surrounding Air Temperature 0 °C … +50 °C
Pollution degree 2
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, Manual PROFINET Coupler 4 8 MB TB20, Manual PROFINET Coupler
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, GSDML file for PROFINET Bus Coupler (from firmware version 1.02, please update your firmware) 20190319 45 KB TB20, 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


 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 PROFINET IO, STEP Files 3 MB TB20-C, Buskoppler PROFINET IO, 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.