可編程控制器（programmable logical controller，簡稱PLC）已經越來越多地應用于工業控制系統中，并且在自動控制系統中起著重要的作用。所以，對PLC的正確選擇是重要的。
面對眾多生產廠家的各種類型PLC，它們各有優缺點，能夠滿足用戶的各種需求，但在形態、組成、功能、網絡、編程等方面各不相容，沒有一個統一的標準，無法進行橫向比較。下面提出在自動控制系統設計中對PLC選型的一些看法，可以在挑選PLC時作為參考。
可以通過以下幾方面的比較，挑選到適合的產品。
這一點尤為重要。在自動控制系統設計之初，就應該對控制點數（數字量及模擬量）有一個準確的統計，這往往是選擇PLC的首要條件，一般選擇比控制點數多10%~30%的PLC。這有幾方面的考慮：
1、可以彌補設計過程中遺漏的點；
2、能夠保證在運行過程中個別點有故障時，可以有替代點；
3、將來增加點數的需要。
工作環境是PLC工作的硬性指標。自控系統將人們從繁忙的工作和惡劣的環境中解脫出來，就要求自控系統能夠適應復雜的環境，諸如溫度、濕度、噪音、信號屏蔽、工作電壓等，各款PLC不盡相同。一定要選擇適應實際工作環境的產品。
ALLEN BRADLEY 150-A54NCD 150A54NCD
ALLEN BRADLEY 1400-PD52A 1400PD52A
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ALLEN BRADLEY 1326AS-B440G-21 SERIES A **
ALLEN BRADLEY 1326AB-C3E-11-2287B 1326ABC3E112287B
ALLEN BRADLEY 1326AB-B740C-21-L 1326ABB740C21L
ALLEN BRADLEY 1326AB-B430G-M2K4L * IN BOX*
ALLEN BRADLEY 1326AB-B420H-M2L 1326ABB420HM2L
ALLEN BRADLEY 100-B400NA3 100B400NA3
ABB 57288531 Memory 86-192K Allen Bradley Stromberg 200039
8520-ASM3 ALLEN BRADLEY ELECTRONIC CIRCUIT BOARD
8500-B1D-K1B ALLEN BRADLEY SERVO MOTORS REMANUFACTURED
6180-EIKEGZDBEZZ ALLEN BRADLEY MONITORS CRT REMANUFACTURED
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1785-L86B /E Allen Bradley PLC 5 Processor 1785L86B 163G
1394-SJT05-C-RL ALLEN BRADLEY 1394 5KW SYSTEM MODULE
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* 2013* Allen Bradley 1756-L75 /B ControlLogix Processor 32MB QTY WARRANTY
**SEALED**Allen Bradley 1770-KFC15/1770KFC15 **** **WARRANTY**
* * Allen Bradley 2711-K9C3 PanelView 900 Color Operator Interface w/ DH-485