BENTLY NEVADA 45095-02

• 型号：45095-02


• 数量：3


• 制造商：　厦门兴锐达自动化设备有限公司


• 有效期：2019/10/10 0:00:00

BENTLY NEVADA 45095-02

BENTLY NEVADA 45095-02

BENTLY NEVADA 45095-02

PLC控制系统与继电器控制系统的区别 ：

   ⑴ 组成器件不同：继电器控制线路是许多真正的硬件继电器组成，而梯形图则由许多所谓“软继电器”组成。

   ⑵ 触点数量不同：硬继电器的触点数量有限，用于控制的继电器的触 点数一般只有4～8对；而梯形图中每个“软继电器”供编程使用的触点数有无限对。

   ⑶ 实施控制的方法不同：在继电器控制线路中，实现某种控制是通过各种继电器之间硬接线解决的。而PLC控制是通过梯形图即软件编 程解决的。

   ⑷ 工作方式不同：在继电器控制线路中，采用并行工作方式；而在梯形图的控制线路中，采用串行工作方式。

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