GE PLC70-90 PID指令汉化说明.docVIP

PID The Proportional plus Integral plus Derivative (PID) control function is the best known general purpose algorithm for closed loop process control. The Series 90 PID function block compares a Process Variable (PV) feedback with a desired process Set Point (SP) and updates a Control Variable (CV) output based on the error. 比例积分微分（PID）控制功能是最有名的闭环过程控制的通用算法。 90系列PID功能块比较过程变量（PV）反馈过程设定点（SP）和更新控制变量（CV）输出基于错误。 The block uses PID loop gains and other parameters stored in an array of 40 16 bit words (discussed on 82) to solve the PID algorithm at the desired time interval. All parameters are 16 bit integer words for compatibility with 16 bit analog process variables. This allows %AI memory to be used for input Process Variables and %AQ to be used for output Control Variables. The example shown below includes typical inputs. 块使用PID回路增益及其他参数的存储阵列中的40 16位字（第12-82页上的讨论），解决PID算法所需的时间间隔。所有参数都是16位兼容16位模拟过程变量整型字。这使得％AI内存可用于输入过程变量和％AQ用于输出控制变量。下面的例子包括典型的输入。 As scaled 16 integer numbers, many parameters must be defined in either PV counts or units or CV counts or units. For example, the SP input must be scaled over the same range as PV because the PID block calculates the error from the difference of these two inputs. The PV and CV counts can be –32000 or 0 to 32000, matching analog scaling or from 0 to 10000, to display variables as 0.00% to 100.00%. The PV and CV Counts do not have to have the same scaling, in which case there will be scale factors included in the PID gains. 随着规模的16个整数，许多参数必须定义在PV数量或单位或CV数或单位。例如，SP输入，必须在相同的范围内光伏缩放，因为PID块计算这两个输入从差分误差。 PV和CV计数可以是-32000或0到32000，匹配模拟缩放或从0到10000，显示变量0.00％至100.00％。 PV和CV计数不必具有相同的标度，在这种情况下，将包括在PID增益的比例因子。 Note The PID will not execute more often than once every 10 milliseconds. This could change your results if you set it up to execute every sweep and the sweep is less than 10 milliseconds. In such a case, the PID function will not run until enough sweeps have occurred to accumulate an elapsed time of 10 milliseconds. For example, if