在复杂的逻辑控制结构中这一功能特别有 用，此时操作员的快
速干预非常重要。
通口0出J
设定值曲线显示:
系统提供–种设定值时间函数功能块，它用于定义某个模拟变量在确定时间段内其值随时间的变
化过程。典型应用是将PID回路的SP(设定点)定义成一个对时间的函数而不是–般的常数。设定值变
化曲线最多可由32段直线顺序相连而成。DigiVis 上与此功能块对应的画面就是设定值曲线显示，画
面操作简单，允许的操作如切換操作方式及在线修改设定值等。在手动方式下可改变对原组态的设定
点的偏置:大小来定义手动设定值，也可随时恢复原始设定值.设定值时间函数程序可反复循环执行，
也可指定运行次数。
趋势显示和归档
模拟和数字过程变量随时间的变化过程可以趋势画面进行显示并归档存储。
devices (10000 i/0).
Fi820f: two serial interfaces are provided to connect the serial protocol equipment. The maximum transmission rate is 38.4kbd and can be configured. Its Standards Association
Modbus Different physical interfaces can be selected for different connection schemes, RS422, RS485, RS232. All interfaces are electrical isolation
Away. And the redundant operation is realized by two redundant field controllers.
Fi8i0f card is a triple can bus protocol interface card (rate 1mbd) used to connect industrial ial “conventional process control station
The i/0 protection unit of the PS is used to receive process signals from the rack mounted i/0 modules supported by the PS. Each field controller PS can only be configured
-Block fi810f card. — The two fi810f interface cards on the redundant PS. can be switched
