Industrial PLC Networking: Practical Selection Guide for Three Topologies
Industrial PLC Networking: Practical Selection Guide for Three Topologies
Network Dilemma: Industrial scenarios require balancing real-time response, cost, and scalability. Different topologies vary significantly in suitability:
| Topology | Latency Range | Redundancy | Typical Scenario |
|---|---|---|---|
| Star | 5-20ms | Low (hub-dependent) | Small workshops (<50 nodes) |
| Ring | 1-5ms | High (self-healing) | Automotive lines (PROFINET IRT) |
| Bus | 10-100ms | Medium (terminators) | Warehouse logistics (CAN bus) |
Protocol Selection:
High Real-Time: EtherCAT or PROFINET IRT with cycles ≤1ms, ideal for robotic coordination.
Cross-Vendor Integration: Modbus TCP (compatible with 90% of industrial devices), though sacrifices real-time performance (10-100ms).
Safety Design:
Hardware-Level: Dual-port redundancy (e.g., Siemens S7-1500), switch time <100ms.
Data Layer: AES-256 encryption to prevent unauthorized command injection.
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