Talking about the four mainstream real-time interfaces of industrial Ethernet
When it comes to system evaluation, openness is a critical factor in ensuring long-term operational sustainability. Alongside this, technical and strategic considerations are essential in making decisions that guarantee long-term investment security.
Compatibility with existing application specifications is an important aspect of any industrial communication system. It ensures seamless integration with current infrastructure and reduces the need for extensive modifications.
EMC susceptibility and transmission reliability are crucial factors when choosing a communication protocol. Cluster frames are more prone to electromagnetic interference compared to individual frames. If one frame gets corrupted, the entire bundled frame may be lost, leading to data integrity issues.
Electrical connection points also play a significant role in system performance. A unique feature of EtherCAT is its ability to route all communications through the internal I/O terminal bus. However, this can introduce additional interference, which may affect overall system stability.
Flexible line topology is another key consideration. EtherCAT and SERCOS networks typically use a logical loop, which can be physically closed at the master station or via a daisy-chain configuration. EtherCAT supports branch connections through specific junctions, but the overall data flow still follows the logical loop structure.
High availability is a major concern in industrial environments where downtime can be costly. POWERLINK is the only protocol that includes both master and line redundancy in its specifications and has been successfully implemented in real-world projects. PROFINET and Ethernet/IP can also support high availability through custom switching methods.
Hot swap capability allows for the replacement of devices without shutting down the entire network. POWERLINK, Ethernet/IP, and PROFINET support this feature. However, SERCOS III and EtherCAT have limitations due to their ring topologies. SERCOS III allows a node to be removed from the network, and the adjacent nodes can reconnect through the master station. EtherCAT, on the other hand, does not support hot swapping.
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