DTDX991A模拟量输出卡件
PD是具有手动复位的纯比例控制器。它是五种控制器类型之一，可用于一个循环基础。
手动复位允许设置控制器的输出对于正常操作值（即，当过程等于给定负载条件下的设定点）。
当参数TD为非零。控制器包括自动调谐功能，该功能：可以使用quick从操作员面板启动调谐功能。
当输入A为高（1）时，控制器将在正常自动模式，当低（0）时，导致控制器
输出以跟踪反馈信号以消除颠簸切换到自动时的输出。这是通过以下方式实现的：强制重置组件R为将保持的值（GE+R）等于反馈值。当控制器
切换为自动时，重置组件的值将：以一定的速率更改回手动重置MR值由MR TLAG设置确定。当MRTRCK是设置为“是”，手动重置MR也将跟踪输入A为低时的反馈信号。
输入I，当从低（0）变为高（1）或高至低
将导致控制器初始化（即消除在该扫描周期期间的任何比例增益动作）。这可用于防止在更改时碰撞输出通过开关块使其达到设定点。进程范围指针参数应指向包含范围缩放的另一个函数块，例如作为过程变量源的模拟输入。这使控制器能够规范化以下参数的调整参数：工艺范围。如果未配置此参数，控制器将使用0.00-100.00的范围缩放热或冷加电时，输出将初始化为MINSCALE，所有动态元素将初始化为第一次扫描时的电流输入。控制器输出具有MINSCALE和MAXSCALE参数，允许对输出信号进行缩放工程范围，而不是默认值0-100 PRCT。当控制器输出为设置点到另一个控制器。当自动调谐设置为“是”时，可使用调谐按钮访问自动调谐功能。它可以启动当回路处于自动或手动时。当启动时，自动调谐器用开-关代替PD控制器控制功能，将A/M模块置于Auto（如果处于Man），并通过六个开-关周期循环控制回路同时学习其用于为PD控制器提供调谐建议的过程动力学。
PD is a proportional only controller with manual reset. It is
one of five controller types that can be used on a one per
loop basis.
Manual reset allows the output of the controller to be set
for a normal operating value (i.e. the desired output when
the process equals setpoint under a given load condition).
Derivative action is provided when the parameter TD is
non-zero. The controller includes an autotune feature that
can be initiated from the operator faceplate using the quick
TUNE feature.
When input A is high (1) the controller will operate in the
normal auto mode and when low (0) causes the controller
output to track the feedback signal to eliminate bumping
the output when switching to auto. This is accomplished by
forcing the reset component R to a value that will keep
(GE+R) equal to the feedback value. When the controller
is switched to auto the value of the reset component will
change back to the manual reset MR value at a rate
determined by the MR TLAG setting. When MRTRCK is
set to YES the manual reset MR will also track the
feedback signal when input A is low.
Input I, when changed from low (0) to high (1) or high to
low, will cause the controller to initialize (i.e. eliminate
any proportional gain action during that scan cycle). This
can be used to prevent bumping the output when changes
are made to the setpoint through a switch block. The process range pointer parameter should point to another function block that contains range scaling, such as an
analog input that is the source of the process variable. This enables the controller to normalize tuning parameters for
the process range. If this parameter is not configured, the controller will use a range scaling of 0.00-100.00. During
a warm or cold power up the output will be initialized to MINSCALE and all dynamic elements will be initialized at
the current input on the first scan.
The controller output has MINSCALE and MAXSCALE parameters allowing the output signal to be scaled for
engineering ranges other than the default of 0 - 100 PRCT. This may be necessary when the controller output is the
setpoint to another controller.
The Autotune feature is accessible using the TUNE pushbutton when AUTOTUNE is set to YES. It can be initiated
while the loop is in Auto or Manual. The autotuner, when initiated, replaces the PD controller with an on-off
control function, places the A/M block in Auto (if in Man), and cycles the control loop through six on-off cycles
while learning the process dynamics which it uses to provide tuning recommendations for the PD controller.
