TB20-C, bus coupler
DeviceNet Slave

TB20-C, Buskoppler DeviceNet SlaveTB20-C, Buskoppler DeviceNet Slave Front
TB20-C, Buskoppler DeviceNet Slave
TB20-C, Buskoppler DeviceNet Slave Front

DeviceNet Slave

The DeviceNet Slave bus coupler connects the DeviceNet bus to peripheral modules. As a group 2 server, the coupler supports the “Predefined Master/Slave Connection Set” in accordance with sections 3-6 of the “CIP Networks Library Vol. 3.” In addition, the slave software, with the help of an “Unconnected Message Manager“ (UCMM), enables the dynamic setting up of multiple communications channels.
You can also choose from various combination possibilities for your I/O data and three kinds of DeviceNet connections: “Polled-I/O”, “Bit-Strobed-I/O,” and “COS/Cyclic-I/O.“ It is also equipped with a 2 kByte I/O data image table.
It recognizes all connected peripheral modules and assigns each module the inputs/outputs from the process image table.  
Thanks to the TB20-ToolBox, it is easy to configure the system and the various module parameters and transfer them to the coupler.

A functioning TB20 configuration will always require a bus coupler and at least one peripheral module. The bus coupler supports hot-swapping for replacing modules during operation.

  • 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 functionality (I/O check)
  • Concealed "factory reset" switch for restoring the module to its factory settings
  • Group 2 server 
  • UCMM-compatible 
  • Polled, Bit-Strobe, COS/Cyclic connections 
  • Supports Offline Connection Set, Device Heartbeat, and Device Shutdown messages 
  • MAC ID and transfer rates can be set via software and hardware (DIP switch) 
  • Supports 125, 250, and 500 kbps 
  • Up to 64 TB20 modules 
  • 1024 bytes of input data / 1024 bytes of output data 
  • 120 bytes of parameter data per module 
  • Modules can be freely configured via “TB20-ToolBox” 
  • Configuration with Rockwell RSNetWorx© possible using explicit messaging 
  • Reading out of coupler status possible using explicit messaging
  • Six LEDs, four of them bi-color (three DeviceNet LEDs and one TB20-specific) 
  • Offers an Open Style Connector 
Download PDF datasheet
General information
Order number 600-165-1AA11
Article name TB20-C, DeviceNet Slave bus coupler
Scope of delivery Bus coupler DeviceNet Slave, 24 V power supply connector, bus cover element, base module
Dimensions (DxWxH) 73 x 35 x 110 mm
Weight Approx. 115 g
DeviceNet interface
Number 1
Protocol DeviceNet
Transmission rate 125, 250, and 500 kbps
I/O image size 1024/1024 bytes
Parameters per module 120 bytes
Connection DeviceNet Open 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 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, Manual DeviceNet Bus Couppler 2 8 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, EDS file for DeviceNet Bus Coupler 1.0 4 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 DeviceNet Slave, STEP Files 3 MB TB20-C, Buskoppler DeviceNet Slave, 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.