PLC Extensions

CANopen® Interfaces for SIMATIC®
Industrial Automation Systems

The CANopen modules by HMS enable system integrators to easily and inexpensively integrate CANopen field devices with SIMATIC industrial automation equipment. The modules allow interaction between PROFIBUS or PROFINET controllers – such as the S7-1200 or ET200S device series – with CAN/CANopen fieldbus devices (gateways).

CANopen Extensions for PLCs

Siemens tool support

Fully integrated into the hardware catalog of TIA Portal or STEP 7. PLC function blocks available for fast integration.


CAN 2.0A mode

Supports implementation of any custom CAN based fieldbus protocol due to CAN 2.0A mode.


Cost-effective solution

Enables easy and inexpensive integration of CAN or CANopen based devices with Siemens equipment.

CM CANopen

CANopen Master/Slave module
for the SIMATIC® S7-1200 PLC

The CM CANopen enables system integrators to connect any CANopen or CAN 2.0A device to the SIMATIC S7-1200 PLC. The module plugs into the communication module interface of the S7-1200 and acts as a bridge between the CANopen or CAN devices and the SIMATIC basic controller, allowing integrators to choose from a wider range of automation products when designing their system.

Order codes: 021620-B

CM CANopen Module


  • Plug-in CANopen master/slave module for SIMATIC S7-1200 basic controller
  • Connects up to 16 CANopen slave devices per module in master mode
  • 256 byte input and 256 byte output per module
  • Up to 3 CM CANopen modules can be connected to one S7-1200
  • LEDs provide diagnostic information on module, network and I/O status
  • Fully integrated into the hardware catalog of the TIA Portal configuration environment
  • CANopen configuration via the included CM CANopen Configuration Studio software
  • Support for transparent CAN 2.0A for custom protocol implementation
  • Pre-made function blocks available for easy PLC programming in TIA portal
  • Complies to the specifications CiA 301 version 4.2 and CiA 302 version 4.1 published by CAN in Automation
  • 3 year product guarantee


CANopen configuration and TIA Portal integration

The seamless integration into the SIMATIC world is one of the most essential requirements when extending of the SIMATIC automation system with networked fieldbus equipment that is not based on either PROFIBUS or PROFINET. HMS has addressed this need enabling a seamless integration of the CM CANopen module into TIA Portal. Configuration of the connected CANopen network is intuitively performed with the included CM CANopen Configuration Studio.

Once the configuration is finalized, the CANopen network configuration is downloaded into the CM CANopen module and localz stored in non-volatile memory. If one of the slave devices in the connected CANopen network has to be replaced, configuration data for this device will be downloaded automatically by the CM CANopen module once the device is reattached, significantly reducing down-times in high availability applications.

CM CANopen - Project definition with TIA Portal     Definition of a SIMATIC S7-1200 with multiple CM CANopen modules in TIA Portal     Programming in TIA Portal     CANopen network configuration with the CM CANopen Configuration Studio

Technical specifications

Power supply +5 VDC +10 / -10%, supplied from S7-1200 controller
Current consumption max. 200 mA at 5 V
Dimensions Width: 30 mm, 1.18"; Height: 100 mm, 3.94"; Depth: 72 mm, 2.91"
Weight 120 g, 0.26 lb
Temperature Operating: 0 °C to +60 °C, +32 °F to +140 °F; Non-operating: -40 °C to +70 °C, -40 °F to +158 °C
Relative humidity Operating: 15 to 95% non condensing; Non-operating: 5 to 95% non condensing
Housing Plastic housing, DIN rail (35•7,5/15), protection class IP20
Certification CE, UL, cUL

Technical services

Getting Started Support

We offer our customers support via phone, e-mail and Teamviewer in getting started the quickest way possible. This includes assistance in installation of the gateway, explaining the included programming examples, and giving an introduction to configuration.

Configuration Support

Our experienced engineers can support you in configuring the gateway to fit into your application. This includes analyzing your system setup and requirements, adapting the configuration of the gateway, optimizing your PLC program and configuration. Communication is usually via e-mail, phone and Teamviewer. Optionally we can offer to come to your site and work with your engineers directly at your system.

CAN 2.0A mode

Transparent CAN 2.0A functionality with the CM CANopen

With the transparent CAN functionality, the CM CANopen module allows transmission of any CAN frame from the PLC regardless of the higher level CAN protocol and is capable of receiving a number of pre-defined CAN frames from the CAN network.

CAN 2.0A is the underlying protocol of many fieldbus protocols, CANopen being one of them. When the application disables CANopen functionality, it still retains access to this protocol.

HMS provides PLC function blocks for this functionality that gives the designer of the PLC program the possibility to interpret/generate any CAN frame directly in the PLC program and thereby making it possible to implement customer specific protocols. Furthermore, it is also possible to connect nodes that only support customer specific CAN protocols to a PROFINET network using the S7-1200 controller as a gateway.

CAN 2.0A supported features

  • Possibility to implement any custom CAN based protocol which is interpreted or generated by the PLC
  • Purpose built PLC function blocks available for easy integration in to TIA Portal
  • CAN frames pass transparently through the CM CANopen module
  • Supports the CAN 2.0A standard (11-bit CAN identifiers)
  • Selectable baud rate from 20 kbit/s – 1 Mbit/s
  • CANopen functionality is disabled while in transparent CAN mode

Application images

CM CANopen Diagram                              CM CANopen Module Views

Order number

021620-B CM CANopen module,
DSUB with screw terminals for subnetwork,
CM CANopen Configuration Studio CD,
USB configuration cable
on request Getting Started Support: 4h package including assistance in installation of the gateway, explaining programming examples, introduction to configuration (no full system configuration). Support is offered via phone, e-mail and Teamviewer.
on request Configuration Support: 1 day (=8h) package including preparation and analysis in cooperation with customer, workshop via Teamviewer or at customer site (optional), wrap-up including report, documentation upon agreement.

Learn more about the PLC expansions
Click to see typical application areas...

Typical applications areas

  • Control of motion devices in packaging machines or conveyor belts
  • Acquisition of encoder positions in wind turbines
  • Acquisition of measurement data from transducers, inclinometers or encoders
  • Control of hydraulic valves
  • Networking of medical devices
  • and more...

The 1 SI CANopen for the SIMATIC ET200®S modular I/O system and the CM CANopen module for the SIMATIC S7-1200® basic controller implement the HMS CANopen master technology in a compact format fully integrated with the SIMATIC hardware. They allow to directly extend SIMATIC automation solutions with CAN or CANopen based equipment making more expensive and space demanding PROFIBUS or PROFINET to CANopen gateways unnecessary. 

Both modules are supported by optimized and highly intuitive CANopen configuration tools that enable users to quickly generate all required configuration data for the CANopen network.
Due to the support for operation in transparent CAN 2.0A mode, system integrators have the possibility to implement any custom CAN based fieldbus protocol.

contact-symbolsNext step – Contact us
Click to see contact options for this product area...

Find a Distributor

Find a distributor

Find a Distributor

Embedded Control – Contact Form

Compare the features of the CM CANopen and the 1 SI CANopen module

Feature tables...


CAN Brochure

Download our latest CAN brochure as PDF file and learn more about the various products we offer for CAN and CAN FD...
Technical Services

Development services and OEM products

From brand-labelling, to HW/SW modification to completely custom designed products.

One product – many applications

HMS offers flexible solutions for a wide range of industries and applications – from industrial automation to automotive test systems.