1783-US7T1F

1783-US7T1F

1783-US7T1F

（ 6 ）据是否联网通信选型

若 PLC 控制的系统需要联入工厂自动化网络，则 PLC 需要有通信联网功能，即要求 PLC 应具有连接其他 PLC 、上位计算机及 CRT 等的接口。大、中型机都有通信功能，目前大部分小型机也具有通信功能。

（ 7 ）对 PLC 结构形式的选择

在相同功能和相同 I/O 点数据的情况下，整体式比模块式价格低。但模块式具有功能扩展灵活，维修方便（换模块），容易判断故障等优点，要按实际需要选择 PLC 的结构形式。

2 ．分配输入 / 输出点

一般输入点和输入信号、输出点和输出控制是一一对应的。

分配好后，按系统配置的通道与接点号，分配给每一个输入信号和输出信号，即进行编号。

在个别情况下，也有两个信号用一个输入点的，那样就应在接入输入点前，按逻辑关系接好线（如两个触点先串联或并联），然后再接到输入点。

现货，现货，降降降，火火火，火火火……

现货，现货，降降降，火火火，火火火……

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