在操控體系邏輯聯(lián)系較雜亂（需求大量中心繼電器、時刻繼電器、計數(shù)器等）、工藝流程和產品改型較頻頻、需求進行數(shù)據(jù)處理和信息管理（有數(shù)據(jù)運算、模擬量的操控、 PID 調理等）、體系要求有較高的牢靠性和安穩(wěn)性、預備實現(xiàn)工廠主動化聯(lián)網等狀況下，運用 PLC 操控是很必要的。
目前，國內外眾多的生產廠家供給了多種系列功用各異的 PLC 產品，運用戶眼花繚亂、無所適從。所以全面權衡利弊、合理地挑選機型才干達到經濟實用的意圖。一般挑選機型要以滿意體系功用需求為主旨，不要盲目貪大求全，以免構成投資和設備資源的糟蹋。機型的挑選可從以下幾個方面來考慮。
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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