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RS485 Combined Control System Wiring and Address Planning

Slave address allocation, terminal resistance and common ground processing when multiple cabinets are connected in parallel to reduce packet loss in on-site communication.

2022-03-211 min read139 views21 shares
RS485 Combined Control System Wiring and Address Planning

地址分配原则

从站地址按柜体物理顺序递增,预留 10 的间隔便于后期增补。

同一总线建议不超过 32 个从站,超出时增加中继或拆分总线。

接线要点

  • 手拉手拓扑,禁止星型分支
  • 总线首末端各接 120Ω 终端电阻
  • 屏蔽层单点接地,避免形成地环路

共地与干扰

柜体之间必须共地,接地电阻差异过大会导致电平漂移,表现为随机丢包。

现场若与变频设备同槽走线,建议改用双绞屏蔽线并加磁环。

调试顺序

先单柜自检,再两柜互联,最后整组联调,逐段确认通信质量。

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