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使用集成在系统的功能块库来实现定时
集成在STEP7软件中,有许多功能库,在库中有些功能块是与计时相关的。比如:SF3"TP"对应基本定时器中的脉冲型定时器;SFB4 "TON"对应延时接通型定时器;SFB5 "TOF"对应延时断开型定时器。但这些功能块的预置定时值却是32位的TIME数据类型,计时精度是1ms。最大的定时值可以达到24天20小时31分23秒648毫秒,这样极大地扩展了计时的范围。
这三个功能块的参数是类似的,下面以SFB4 "TON"为例作介绍,参照图3,IN端是触发信号输入端,它的上升沿触发定时器运行;PT是 预置定时时间,是TIME数据类型;Q端是输出端,可以得到定时器的状态;ET是当前计时值输出端。
此外,在STEP7标准功能块中,还有-类型的定时器,比如说软件型延时接通定时器FC80“TONR”。它的特性与普通的定时器没什么不同,所不同的是它每步累加的时间是OB1上次循环扫描的执行时间,这一点要特别注意
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