在操控体系逻辑联系较杂乱（需求大量中心继电器、时刻继电器、计数器等）、工艺流程和产品改型较频频、需求进行数据处理和信息管理（有数据运算、模拟量的操控、 PID 调理等）、体系要求有较高的牢靠性和安稳性、预备实现工厂主动化联网等状况下，运用 PLC 操控是很必要的。
目前，国内外众多的生产厂家供给了多种系列功用各异的 PLC 产品，运用户眼花缭乱、无所适从。所以全面权衡利弊、合理地挑选机型才干达到经济实用的意图。一般挑选机型要以满意体系功用需求为主旨，不要盲目贪大求全，以免构成投资和设备资源的糟蹋。机型的挑选可从以下几个方面来考虑。
Before making the decision plan of the system control plan, it is necessary to understand the control requirements of the controlled target in detail, and then decide whether to use PLC for control.
Under the condition that the logic connection of the control system is messy (requiring a large number of central relays, time relays, counters, etc.), the process flow and product modification are frequent, data processing and information management are required (including data operation, analog quantity control, PID conditioning, etc.), the system requires high reliability and stability, and the factory is ready to realize active networking, it is necessary to use PLC control.
At present, many manufacturers at home and abroad provide a variety of PLC products with different functions, which makes users dazzled and at a loss. Therefore, only by comprehensively weighing the advantages and disadvantages and reasonably selecting models can we achieve the purpose of economy and practicality. Generally, the selection of models should be based on satisfying the functional needs of the system, and do not blindly seek perfection, so as to avoid the waste of investment and equipment resources. The selection of models can be considered from the following aspects.
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