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

  • 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 number 600-151-1AA11
Article name TB20-C, PROFIBUS-DP bus coupler
Scope of delivery Bus coupler PROFIBUS-DP, 24 V power supply connector, bus cover element, base module
Dimensions (DxWxH) 73 x 35 x 110 mm
Weight Approx. 115 g
PROFIBUS interface
Number 1
Protocol PROFIBUS DP/V0 & DP/V1
Transmission rate 9.6 Kbaud ... 12 Mbaud, automatic detection
I/O image size 244/244 bytes
Parameter configuration length 244 bytes
Interface RS485
Connection 9-pin D-sub female connector
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 VDC, 18–28 VDC
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 PROFIBUS-DP Bus Coupler 5 10 MB
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, GSD file for PROFIBUS-DP Bus Coupler 1.48 75 KB
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 PROFIBUS-DP, STEP Files 3 MB TB20-C, Buskoppler PROFIBUS-DP, 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.