西门子6ES7158-0AD01-0XA0 介质模块

西门子6ES7158-0AD01-0XA0 介质模块

IEC61131-3的程序结构

　　IEC61131-3是PLC的编程语言标准。IEC61131-3是个，也是至今为止的工业控制领域的编程语言标准。IEC

　　61131-3有三种POU：程序、功能块和功能。

　　功能是有多个输入参数和一个输出参数（返回值）的POU，返回值的名称与功能的名称相同，需要定义返回值的数据类型。调用具

　　有相同输入值的功能总是返回相同的结果。功能可以调用其他功能，但是不能调用功能块或程序。功能可定义的局部变量有VAR和VAR_INPUT。

　　功能块是有多个输入/输出参数和内部存储单元的POU，功能块的输出参数值与其内部存储单元的值有关。功能块可以调用其他功能

　　块或功能，但是不能调用程序。

　　在调用功能块之前，在要调用功能块的POU中为每次调用声明功能块的实例，操作系统将为每次调用分配功能块的存储区

　　（类似于S7-300/400的背景数据块）。

　　功能因为没有内部存储区，调用时不需要实例化。

　　程序的行为和用途类似于功能块，程序具有输入和输出参数，而且可以具有内部存储区。程序通常包含有对功能和功能块的调用。

　　IEC61131-3定义了若干标准的功能和功能块。

Keyence Sensor GT2-71N   In Box

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KEYENCE Sensor CZ-H35S CZH35S   in box free ship

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KEYENCE Sensor Amplifier LV-N11P LVN11P   in box free ship

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KEYENCE RGB Sensor CZ-V21AP CZV21AP   in box free ship

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Keyence RD-50R with 2 x AT2-301 Sensor Controller

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KEYENCE POWER SUPPLY MS-H150 6.5A 2unit + MS-H50 2.1A 1unit

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Keyence Positioning Module KV-MC40V   IN BOX

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KEYENCE PLC SET KZ-U4 KZ-A500 C32X 4EA C32T 4EA KZ-L10 1EA

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Keyence PLC KV-E16T   IN BOX

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