Overview
What are DeviceNet / CANopen Modules?
DeviceNet and CANopen modules are industrial communication interfaces based on the Controller Area Network (CAN) physical layer. These modules allow PLCs, motor drives, and I/O blocks to exchange data over a robust, bus-based network. DeviceNet utilizes the Common Industrial Protocol (CIP) for seamless integration into Rockwell Automation environments, while CANopen provides a standardized application layer for motion control and decentralized automation, common in European machinery.
These modules serve as either "Scanners/Masters" (initiating communication) or "Adapters/Slaves" (responding to requests), facilitating the transmission of time-critical data and diagnostic information between the controller and field devices.
Main Manufacturers
PALM Parts Solution stocks high-availability communication modules from the industry’s leading providers:
- Allen-Bradley: Specializing in DeviceNet scanners and adapters for the Logix and SLC platforms.
- GE Fanuc: Providing bus interface modules for Series 90-30 and PACSystems.
- Lenze: Focusing on CANopen communication cards for frequency inverters and servo drives.
- Omron: Offering master and slave units for the SYSMAC platform and decentralized I/O.
Typical Applications
These modules are frequently used in high-vibration or high-noise environments where wiring complexity must be reduced. Typical applications include:
- Conveyor Systems: Linking multiple motor starters and photoeyes across long distances.
- Packaging Machinery: Synchronizing motion control via CANopen on Lenze or Omron systems.
- Automotive Assembly: Connecting robotic cells to a central Allen-Bradley ControlLogix rack using DeviceNet.
- Material Handling: Real-time feedback from encoders and weight scales.
Selection Guide
When sourcing a replacement or expansion module, prioritize the following technical specifications:
- Network Protocol: Confirm if the system requires DeviceNet (CIP-based) or CANopen (DS301/DS402).
- Form Factor: Ensure the module matches your PLC rack or drive expansion slot (e.g., 1756, 1747, or Drive-mounted cards).
- Communication Speed: Verify the module supports the existing baud rate (125k, 250k, or 500k for DeviceNet).
- Baud Rate & Distance: Check if the required cable run fits within the protocol’s distance-to-speed ratio.
- EDS Files: Ensure you have access to the Electronic Data Sheet (EDS) for software integration.
14 products
Frequently asked questions
What is the difference between DeviceNet and CANopen?
DeviceNet is based on the Common Industrial Protocol (CIP) and is primarily used in North American Allen-Bradley environments. CANopen is an open protocol widely adopted by European manufacturers like Lenze. While both use the Controller Area Network (CAN) physical layer, they have different software stacks and are not natively interchangeable without a gateway.
What is the maximum distance for these network modules?
The maximum cable length for DeviceNet at 125 kbps is 500 meters (1,640 ft). For CANopen, the maximum length depends on the bit rate, typically ranging from 25 meters at 1 Mbps to 1,000 meters at 50 kbps. Signal repeaters may be required for longer distances.
What are the wiring and power requirements?
Most DeviceNet and CANopen modules utilize a 5-pin open style or M12 circular connector. They typically require a separate 24V DC power supply (V+ and V-) to power the bus interface and transceiver, independent of the internal PLC backplane power.
Can I replace a module while the system is powered?
Yes, many modules allow for 'Hot Swapping' or Removal and Insertion Under Power (RIUP), such as those in the Allen-Bradley 1756 ControlLogix series. However, always check the specific hardware manual before attempting a swap to prevent bus noise or hardware damage.
How do I configure a new module on an existing network?
You will need the specific EDS (Electronic Data Sheet) file for the module. This file tells the scanner or configuration software (like RSNetWorx for DeviceNet) the device's parameters, identity, and I/O data mapping.