请教专家：
1、在一个wincc项目里，建立两个内部变量：Valve_SteamPress_1和Valve_SteamPress。并在变量里赋初始值Valve_SteamPress_1=55；
2、全局动作里新建一个周期为2S 的定时器，程序如下：
#include "apdefap.h"
int gscAction( void )
{
double Valve_SteamPress_1;
double Valve_SteamPress;
Valve_SteamPress_1=GetTagDouble("Valve_SteamPress_1");
Valve_SteamPress = 5 +Valve_SteamPress_1;
SetTagDouble("Valve_SteamPress",Valve_SteamPress);
SetTagDouble("Valve_SteamPress_1",Valve_SteamPress);
printf("\n");
printf(" Valve_SteamPress= %1.2f ",Valve_SteamPress);
printf("\n");
printf("zhihou Valve_SteamPress= %1.2f Valve_SteamPress_1= %1.2f ",GetTagDouble("Valve_SteamPress"),GetTagDouble("Valve_SteamPress_1"));
return 0;
}
在界面的应用程序窗口里看到的结果是：
Valve_SteamPress= 55.00
zhihou Valve_SteamPress= 55.00 Valve_SteamPress_1= 55.00
Valve_SteamPress= 60.00
zhihou Valve_SteamPress= 60.00 Valve_SteamPress_1= 55.00
Valve_SteamPress= 65.00
zhihou Valve_SteamPress= 60.00 Valve_SteamPress_1= 60.00
Valve_SteamPress= 70.00
zhihou Valve_SteamPress= 65.00 Valve_SteamPress_1= 65.00
Valve_SteamPress= 75.00
zhihou Valve_SteamPress= 70.00 Valve_SteamPress_1= 70.00
Valve_SteamPress= 80.00
zhihou Valve_SteamPress= 75.00 Valve_SteamPress_1= 75.00
Valve_SteamPress= 85.00
zhihou Valve_SteamPress= 80.00 Valve_SteamPress_1= 80.00
从上面的结果看，从第二次运行开始，同样的Valve_SteamPress，SetTag之后打印出来和之前打印出来的不一样。为什么从第二个周期SetTag就赋值不进去了呢？
3、如果是在按钮的C 动作里加同样的程序，然后手动按钮周期运行，则每次的SetTagDouble都可以起作用。
是不是脚本编译器有问题，还是我哪个地方没有设置好？
专家建议
您好！从你的结果来看，赋值语句已经起作用了， 因为Valve_SteamPress值每次都加5。只是第二次的打印语句显示没变化。在显示的时候不要再用操作语句（GetTagDouble），直接用函数中的中间变量Valve_SteamPress。
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