TB20-C, Bus coupler

TB20-C, Buskoppler PROFIBUS-DP Slave
TB20-C, Buskoppler PROFIBUS-DP Slave


The PROFIBUS-DP bus coupler is designed to connect a PROFIBUS bus to TB20 peripheral modules. It supports the DP-V0 and DP-V1 protocols. 
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, but can accommodate up to 64 modules of any kind connected in series with the bus coupler. The bus coupler supports hot-swap for replacing modules during operation.

Bit packing:
Starting with firmware version 1.20, the states of 2-bit and 4-bit I/O modules can be packed together in bytes, making it possible to take full advantage of all the space in the process image table.


  • Diagnostic alarm: On | Off
  • Process alarm: On | Off
  • Pull/plug alarm: On | Off
  • Startup when expected/actual configuration differ:  On | Off  (hot-swaping allowed: Yes | No)
  • Identifier-related diagnostics: On | Off
  • Submodule status: On | Off
  • Channel-related diagnostics: On | Off

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

  • Modules can be replaced during operation (hot-swapping)
  • 24 VDC 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 setting up the I/O system without a higher-level controller in order to test the system`s operation (I/O check)
  • PROFIBUS DP slave as defined in EN 50170/IEC 61158
  • Supports all PROFIBUS baud rates
  • DP-V0 and DP-V1 support
  • Up to 64 peripheral modules
  • Up to 244 bytes of input data and 244 bytes of output data
  • One class 1 master connection with 240 bytes of payload data
  • Up to three class 2 master connections with 240 bytes of payload data (as a DP-V1 slave)
  • I&M data
  • 3 LEDs, one of them bi-color 
  • Concealed "factory reset" switch for restoring the module to its factory settings
Download PDF datasheet
General information
Order number600-151-1AA11
Article nameTB20-C, PROFIBUS-DP bus coupler
Scope of deliveryBus coupler PROFIBUS-DP, 24 V power supply connector, bus cover element, base module
Dimensions (DxWxH)73 x 35 x 110 mm
WeightApprox. 115 g
PROFIBUS interface
ProtocolPROFIBUS DP/V0 & DP/V1
Transmission rate9.6 Kbaud ... 12 Mbaud, automatic detection
I/O image size244/244 bytes
Parameter configuration length244 bytes
Connection9-pin D-sub female connector
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 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 PROFIBUS-DP Bus Coupler 5 10 MB
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, GSD file for PROFIBUS-DP Bus Coupler 1.48 75 KB
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 PROFIBUS-DP, STEP Files 3 MBTB20-C, Buskoppler PROFIBUS-DP, 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.