这样PID模块在计算误差时可减去这两个输人。PV和CV值可从-3200或0’至匹配的模拟换算值32000,或从0至1000,显示变量为0.0%至100,00%PV和CV值可有不同的定标,此时换算因子已包含在PID增益当中。注意PID执行间隔不小于10ms。如果设置的每次扫描时间不足10ms时可修改所希望的结果。否则的话,PID功能模块将停止运行,直到扫描时间累积到10ms;例如.当扫描时间只有9ms,PID功能模块将使下一次扫描逝去时间达18 ms时方执行一次。
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