140ERT85410 询亿佳就购
S7-300/400与IEC61131-3程序结构的区别
1）S7-300/400的功能可以有多个输出参数，返回值也属于输出参数。IEC61131-3的功能只有一个返回值。
2）IEC61131-3的功能块用于保存局部变量的存储区是在声明功能块的实例时分配的，它对用户是不透明的，其他POU不能直接访问该存储区。
S7-300/400的功能块的局部变量（不包括临时变量）保存在它的背景数据块中。其他POU可以访问背景数据块中的变量。如果需要多次调用同一个功能块来控制同一类型的被控对象，每次调用都需要指定一个背景数据块，但是这些背景数据块中的变量又很少，这样在项目中就出现了大量的背景数据块。可以使用多重背景数据块来减少背景数据块的数量。但是需要增加一个用来管理多重背景的功能块。
3）S7-300/400的功能块的局部变量有临时变量和静态变量，IEC61131-3的功能块的内部变量Var相当于S7-300/400的静态变量。
Matrox Mystique: Mechwarrior 2 + Scorched Planet, Matrox, PC CD-ROM
Matrox Mystique: Mechwarrior 2 + Scorched Planet, Matrox, PC CD-ROM
Matrox N2S300MLS/KB P/N 63039624167, Camera as photo, sn:0476, dφm, DHLtoUS.
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Matrox NS-QNIC Ethernet PCI Interface Card New NS-FNIC/4 948-0001 63039620145
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Matrox Odyssey 7139_00 Rev.A Analog Cable Adaptor
Matrox Odyssey Camera link Adapter Y7120_00 No Cable
Matrox Odyssey Camera link Adapter Y7120_00 No Cable
Matrox Odyssey Camera link Cable / Analog Cable 1PCS
Matrox Odyssey Camera link Cable / Analog Cable 1PCS
MATROX ODYSSEY CAMERA link CABLE ADAPTOR Y7120_00
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Matrox Odyssey Y7120-00 Camera link Cable Adaptor 1PCS
Matrox Odyssey Y7120-00 Camera link Cable Adaptor 1PCS
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Matrox P650 128MB PCI Express Dual Monitor Graphic Card
MATROX P650 64MB AGP 8x Dual Monitor Graphics Card
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MATROX P650 64MB AGP 8x DVI/VGA Dual Monitor Graphics Card, TESTED
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