可以啊！
用C脚本：
#pragma code ("kernel32.dll")
VOID GetLocalTime(LPSYSTEMTIME lpSystemTime);
#pragma code ()
unsigned short H;
unsigned short M;
unsigned short S;

if ((GetTagBit("chang")==1)&&(GetTagBit("chang2")==0))
{
SYSTEMTIME sysTime;
GetLocalTime(&sysTime);
H=sysTime.wHour;
M=sysTime.wMinute;
S=sysTime.wSecond;

SetTagWord("Hour",(unsigned short) H);
SetTagWord("Minute",(unsigned short) M);
SetTagWord("Second",(unsigned short) S);
}
SetTagBit("chang2",GetTagBit("chang"));

Hour,Minute,Second分别为wincc无符号16位内部变量。
chang是二进制内部变量，是要监控它的上升沿！
chang2是用于储存chang的上一个周期的状态！
这东西以前单片机做过了，那时侯周期短点！