What should be done to troubleshoot DeviceNet/CAN bus communication errors and packet loss?
Bus Connector Anti-Interference Core Principle
- Interference-Free Connection Design : Standardized wiring, grounding and impedance matching ensure stable bus communication, avoiding signal distortion or communication failure.
Bus Wiring Norms & Anti-Interference Measures
Impedance Matching & Grounding Norms
Terminal Resistance
:
• 120Ω terminal resistor must be connected at both ends of the bus
• No resistor at intermediate nodes
Shield Grounding
:
• Check correct shield grounding (single-point grounding)
• Avoid ground loops to prevent interference
Interference Avoidance & Wiring Check
Interference Source Avoidance
:
• Keep away from strong interference sources (inverters, motors)
• Separate wiring for bus cables and power cables
Connector Check
:
• Ensure consistent connector coding and pin sequence
• Avoid reverse connection or short circuit
Technical Note: Compliance with bus wiring norms (impedance matching, single-point grounding, interference avoidance) is critical to ensure stable and reliable communication performance of the bus system in industrial environments.
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