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.

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

  • 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 number600-165-1AA11
Article nameTB20-C, DeviceNet Slave bus coupler
Scope of deliveryBus coupler DeviceNet Slave, 24 V power supply connector, bus cover element, base module
Dimensions (DxWxH)73 x 35 x 110 mm
WeightApprox. 115 g
DeviceNet interface
Transmission rate125, 250, and 500 kbps
I/O image size1024/1024 bytes
Parameters per module120 bytes
ConnectionDeviceNet Open 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 pending
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 DeviceNet Bus Couppler 2 8 MB
EU Declaration of Confirmity 04-2020 55 KBEU Declaration of Confirmity


Flyer, TB20 IO-system for numerous applications 08-2022 6 MBTB20 IO-system for numerous applications


TB20, EDS file for DeviceNet Bus Coupler 1.0 4 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 DeviceNet Slave, STEP Files 3 MBTB20-C, Buskoppler DeviceNet Slave, 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.