B&R 3IF661.9 应用工控DCS/PLC控制系统欧美备件系列

B&R 3IF661.9 应用工控DCS/PLC控制系统欧美备件系列

B&R 3IF661.9 应用工控DCS/PLC控制系统欧美备件系列

B&R 3IF661.9 应用工控DCS/PLC控制系统欧美备件系列多选择过程自动化应用通常涉及通过化学成分的反应或引入物理变化来生产新的、不同的产品来转化原材料。

这些应用程序可以由一个或多个管道连接的工艺单元操作组成。一个关键特征是操作员看不到产品。它通常装在容器内，性质可能很危险。通常有大量简单和复杂的模拟控制（例如，PID或环路控制），尽管响应时间不是特别快（100ms或更大）。

这种类型的过程通常由DCS控制，尽管PLC的模拟控制能力可能绰绰有余。选择过程中的一个决定因素通常是控制应用程序的范围（即，工厂范围与单个单元以及i/O点的数量）。

如果所制造的每个独立产品的价值相对较低，和/或停机时间导致生产损失，但几乎没有额外或对工艺造成损害，则PLC是可能的选择。如果一个批次的价值很高，无论是原材料还是市场价值，停机时间不仅会导致生产损失，而且会造成潜在的危险和破坏性条件，则应选择DCS。在某些化学应用中，将工艺保持在稳定状态至关重要，因为如果系统故障，产品可能会在管道中固化。如果炼油厂的猫饼干坏了，可能需要几天才能重新上线，这意味着大量的收入损失。

B&R 3IF661.9 应用工控DCS/PLC控制系统欧美备件系列

B&R 3IF661.9 Applications Industrial control DCS/PLC control systems Europe and the United States Spare parts Series Multi-choice process automation applications usually involve the conversion of raw materials by the reaction of chemical composition or the introduction of physical changes to produce new and different products.

These applications may consist of one or more pipe-connected process unit operations. A key feature is that the operator cannot see the product. It is usually contained in containers and can be dangerous in nature. There is usually a large number of simple and complex analog controls (e.g., PID or loop control), although the response time is not particularly fast (100ms or greater).

This type of process is usually controlled by DCS, although the analog control capabilities of PLCS may be more than adequate. A determining factor in the selection process is usually the scope of the control application (i.e., the plant scope versus the number of individual units and i/O points).

If the value of each individual product manufactured is relatively low, and/or the downtime results in a loss of production, but little extra or damage to the process, a PLC is a possible option. If the value of a lot is high, be it raw material or market value, and downtime will not only result in lost production but also create potentially dangerous and destructive conditions, DCS should be chosen. In some chemical applications, it is critical to keep the process in a steady state because if the system fails, the product may solidify in the pipeline. If a refinery's cat biscuits break, it can take days to get them back online, which means a lot of lost revenue.