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由于PLC的NTP时间同步模式总是失败，我想用ｗｉｎｃｃ读取PC的日期和时间，然后吧读取的时间和日期每隔一定的周期再写到PLC实现PLC的时间同步，具体怎么做，希望各位大神赐教
最佳答案
不知道你是什么PLC，不同PLC的数据格式可能不一样。Wincc里这样写的
SYSTEMTIME systime;
char dty,dtm,dtd,dth,dtn,dts;
#pragma code ("kernel32.dll")
void GetLocalTime(SYSTEMTIME *);
#pragma code ()
SYSTEMTIME systime;
unsigned char *p=NULL;
GetLocalTime(&systime);
SetTagDateTime("DT",systime);
//Integer to BCD
/*
p=malloc(8);
*p=(systime.wYear%100/10 <<4)+systime.wYear%10;
*(p+1)=(systime.wMonth/10<<4) +systime.wMonth%10;
*(p+2)=(systime.wDay/10<<4) +systime.wDay%10;
*(p+3)=(systime.wHour/10<<4) +systime.wHour%10;
*(p+4)=(systime.wMinute/10<<4) +systime.wMinute%10;
*(p+5)=(systime.wSecond/10<<4) +systime.wSecond%10;
*/
DT是Wincc内部变量，没有PLC，长度8的日期与时间类型，经实验，这个SetTagDateTime("DT",systime);指令会自动转换格式，很可能是西门子S7-300的DT数据类型格式
接下来PLC里调用一下时钟设置指令，数据就是上面的变量DT，改成外部变量，触发变量在这脚本的末尾设置一下：类似SetTagBit("M0.0",1); 脚本放在全局脚本中，周期执行
图片说明：
提问者对于答案的评价：
我的PLC是412-5H，我试一下，谢谢您！
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Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357
Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357
Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357
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