FBM206 FOXBORO DCS控制系统 福克斯波罗控制器

FBM206 FOXBORO DCS控制系统 福克斯波罗控制器

FBM206福克斯波罗FOXBORO控制器，人们印象当中PLC的运算速度也比DCS要快很多。从某一个角度来看确实如此，PLC执行逻辑运算的效率很高，执行1K逻辑程序不到1毫秒，其控制周期(以DI输入直接送DO输出为例)可以控制在50ms以内;而DCS在处理逻辑运算和模拟运算时采用相同的方式，其控制周期往往在100ms以上。

我们用PID算法来比较时，可以发现PLC执行一个PID运算在几个毫秒，而NETWORK6000+DCS的T2550控制器解算一个PID也需要1个毫秒，这说明PLC和DCS和实际运算能力是相当的,某此型号的DCS控制器甚至更强。而控制周期上的差异主要与控制器的调度设计有关。

新型的DCS控制器学习了大型PLC的设计，在控制周期方面的表现获得了大幅度的提高。以NETWORK6000+DCS的T2550控制器为例。控制器可以设置四个不同优先级的任务，运算周期可以设为10ms，配合高速I/O卡件，控制周期能够达到15~20ms。而模拟量运算设置在其它周期较长的任务中。

FBM206 FOXBORO controller, people's impression of the PLC calculation speed is also much faster than DCS. From a certain point of view indeed, the efficiency of PLC logic operation is very high, the execution of 1K logic program is less than 1 millisecond, and its control cycle (taking DI input directly to DO output as an example) can be controlled within 50ms; DCS uses the same method when processing logic operations and simulation operations, and its control cycle is often more than 100ms.

When we use the PID algorithm to compare, we can find that the PLC performs a PID operation in a few milliseconds, and the T2550 controller of NETWORK6000+DCS also needs 1 millisecond to solve a PID, which shows that the PLC and DCS and the actual computing power is equivalent, and a DCS controller of this model is even stronger. The difference in the control period is mainly related to the scheduling design of the controller.

The new DCS controller has learned from the design of large PLCS, and its performance in terms of control cycles has been greatly improved. The T2550 controller of NETWORK6000+DCS is used as an example. The controller can set four tasks with different priorities, and the operation cycle can be set to 10ms. With high-speed I/O cards, the control cycle can reach 15-20ms. The analog computation is set in other tasks with longer cycles.