7MF4433-1CA02-1AA6-Z现货
7MF4433-1CA02-1AA6-Z现货
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。
（ 1 ）确定 I/O 通道范围
不同型号的 PLC ，其输入 / 输出通道的范围是不一样的，应根据所选 PLC 型号，查阅相应的编程手册，决不可“张冠李戴"。必须参阅有关操作手册。
（ 2 ）部辅助继电器
内部辅助继电器不对外输出，不能直接连接外部器件，而是在控制其他继电器、定时器 / 计数器时作数据存储或数据处理用。
从功能上讲，内部辅助继电器相当于传统电控柜中的中间继电器。
未分配模块的输入 / 输出继电器区以及未使用 1 ： 1 链接时的链接继电器区等均可作为内部辅助继电器使用。根据程序设计的需要，应合理安排PLC 的内部辅助继电器，在设计说明书中应详细列出各内部辅助继电器在程序中的用途，避免重复使用。参阅有关操作手册。
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