1、指针寻址
//上段程序为指针寻址中的双字指针；功能：实现数据块查询，即输入要查询的行数，输出要查询的结果，行数从1开始；
单字指针与双字指针的差异：
单字指针只应用在地址标识符是非位的情况下。只能对T、C、DB、FC和FB进行寻址，通俗的说，单字指针只可以只带这些存储区域的编号。
双字指针不仅可以对位进行寻址，还可以对byte、word、Dword进行寻址，并且没有区域限制，不过在对于非位的区域进行寻址时，必须保证其0—2bit位全0！
上例为双字寻址：#INPUT=1,#ZZ=0,即寻址DBD[0.0]；
#INPUT=2,#ZZ=32（0100 000）,即寻址DBD[4.0]；
#INPUT=3,#ZZ=64（1000 000）,即寻址DBD[8.0]；
#INPUT=4,#ZZ=96（1100 000）,即寻址DBD[12.0]；
····

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总结：单字指针的存储器间接寻址只能用在地址标识符是非位的场合；双字指针由于有位格式的存在，所以对位地址标识符没有限制。也正是由于双字指针是一个具有位的指针，因此，当对字节、字或者双字存储区地址进行寻址时，必须确保双字指针的内容是8或者8的倍数。
2、wincc实现分屏方法：一个主机，两个显示器，显示不同画面，可以实现的。硬件上需要多屏显示卡：多分4个屏，不用西门子的也可以。软件上需要WinCC的Basic Proccess Control组件，如果是PCS7自带该组件，普通WInCC需要安装选件Basic Proccess Control，通过选择“自定义”-“选项”-Basic Proccess Control即可安装

1. Pointer addressing
//The upper program is the double word pointer in pointer addressing; Function: realize data block query, that is, input the number of rows to be queried and output the results to be queried. The number of rows starts from 1;
Difference between single word pointer and double word pointer:
A single word pointer applies only if the address identifier is a non bit. It can only address T, C, DB, FC and FB. Generally speaking, a single word pointer can only take the number of these storage areas.
The double word pointer can not only address bits, but also byte, word and DWORD, and there is no area limit. However, when addressing non bit areas, it must ensure that all 0-2bit bits are 0!
The above example is double word addressing: #input = 1, #zz = 0, that is, addressing DBD [0.0];
#Input = 2, #zz = 32 (0100 000), i.e. addressing DBD [4.0];
#Input = 3, #zz = 64 (1000 000), i.e. addressing DBD [8.0];
#Input = 4, #zz = 96 (1100 000), i.e. addressing DBD [12.0];
····
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Summary: the memory indirect addressing of single word pointer can only be used when the address identifier is non bit; Double word pointer has no restrictions on bit address identifier due to the existence of bit format. It is precisely because the doubleword pointer is a pointer with bits. Therefore, when addressing bytes, words or doubleword storage area addresses, it must be ensured that the content of the doubleword pointer is 8 or a multiple of 8.
2. WINCC split screen method: one host, two displays, displaying different pictures, can be realized. Multi screen display card is required in hardware: it can be divided into 4 screens at most, without Siemens. WINCC's basic access control component is required on the software. If PCS7 comes with this component, ordinary WinCC needs to install the option basic access control, which can be installed by selecting "Customize" - "options" - basic access control