PROFINET to CANopen Gateway for Siemens & Delta in Lithium Battery Lines
In modern smart manufacturing, bridging the gap between Ethernet-based controllers and CAN-based drives is essential. A PROFINET to CANopen gateway acts as a real-time translator, allowing Siemens PLCs to command Delta servo drives with high precision—critical in lithium battery production lines.
Why Protocol Conversion Matters in Industrial Automation
Factory floors are rarely homogeneous. Over time, different communication standards have emerged for different layers of the automation pyramid. At the control level, PROFINET has become a dominant Industrial Ethernet protocol, especially with Siemens S7-1200 and S7-1500 PLCs. It offers high bandwidth, real-time capabilities, and seamless IT integration. Meanwhile, at the device level, CANopen remains popular for motion control due to its deterministic behavior, noise immunity, and simple wiring. Delta’s ASDA-A2, A3, and other servo drives natively support CANopen, making them a cost-effective choice for multi-axis applications.
In lithium battery manufacturing—where processes like electrode winding, die-cutting, and stacking demand microsecond-level synchronization—a direct connection between a PROFINET PLC and a CANopen drive is impossible. A protocol gateway solves this by mapping data between the two networks, enabling seamless command and feedback exchange.
Typical System Architecture
- PROFINET Master: Siemens S7-1200/1500 PLC (controller)
- Gateway: PROFINET to CANopen converter (acts as PROFINET device and CANopen master)
- CANopen Slaves: Delta ASDA-A2 servo drives (each with unique Node ID)
- Physical Media: Ethernet cable on PROFINET side; twisted-pair CAN bus on CANopen side
Step-by-Step Configuration Guide
Successful communication hinges on correct mapping of Process Data Objects (PDOs) and Service Data Objects (SDOs). Below is a practical configuration workflow.
Delta Servo Setup (ASDA-Soft)
- Set Node ID via rotary switches (e.g., 1, 2, 3…)
- Configure baud rate: 500 kbps or 1 Mbps (match gateway)
- Define PDO mappings: typically Controlword (6040h), Target Position (607Ah), Statusword (6041h), Actual Position (6064h)
- Enable CANopen communication in drive parameters
Gateway Configuration
- Import GSDML file into TIA Portal; assign IP address and device name
- Map PROFINET I/O data to CANopen PDOs (e.g., first 2 bytes → Controlword of Node 1)
- Set CANopen master parameters: baud rate, heartbeat, SYNC cycle
- Download configuration to gateway
Real-World Applications in Lithium Battery Production
Lithium battery manufacturing involves several high-precision, high-speed processes where multi-axis synchronization is non-negotiable. Here’s how the gateway solution fits into key equipment:
Electrode Winding Machines
Tension control is critical to avoid wrinkles or breaks. The gateway forwards position commands from the PLC to multiple Delta servos via CANopen SYNC PDOs, ensuring coordinated winding and unwinding. Actual torque and speed feedback are transmitted back for closed-loop control.
Die-Cutting Machines
Precise positioning is required for cutting electrode tabs. The PROFINET PLC handles logic and recipe management, while the gateway broadcasts positioning commands to multiple axes simultaneously, achieving high throughput and accuracy.
Stacking Machines (Z-Folding)
Frequent start-stop cycles demand ultra-low latency. The gateway’s fast data forwarding enables real-time interaction between controller and drives, maintaining precise layer alignment.
Key Benefits of Using a PROFINET to CANopen Gateway
Heterogeneous System Integration
Bridges the gap between high-end PLCs and cost-effective CANopen drives, preserving IT openness and real-time stability.
Reduced Wiring Complexity
CANopen’s serial bus topology drastically cuts cable count compared to pulse-train control, lowering fault points and installation effort.
Rich Data Exchange
Real-time access to drive parameters like current, temperature, and fault codes enables predictive maintenance and reduces downtime.
High Synchronization Accuracy
CANopen SYNC telegrams combined with gateway real-time forwarding achieve microsecond-level coordination for tension and positioning tasks.
Scalability
Adding new axes is as simple as connecting another servo to the CAN bus and updating the gateway configuration—no PLC network changes needed.
Practical Tip: When configuring the gateway, always verify the CANopen baud rate and Node ID settings on each drive. Use a CAN bus analyzer to monitor traffic during commissioning to catch mapping errors early.
Choosing the Right Gateway
Several industrial communication vendors offer PROFINET to CANopen gateways. Key selection criteria include:
- PROFINET conformance class (CC-A, CC-B, CC-C) for real-time performance
- Maximum number of CANopen slaves supported
- PDO mapping flexibility and ease of configuration software
- Environmental ratings (temperature, vibration) for harsh production environments
- Diagnostic capabilities via web interface or LED indicators
Popular models include devices from HMS (Anybus), Hilscher, and others, each with their own configuration tools. The integration process remains similar: import device description file, map I/O data, and set CANopen parameters.
By deploying a PROFINET to CANopen gateway, lithium battery manufacturers can leverage the best of both worlds: the advanced control capabilities of Siemens PLCs and the reliable, cost-effective motion performance of Delta servo drives. This integration is a cornerstone of efficient, data-driven production in the era of Industry 4.0.
