可編程控制器（programmable logical controller，簡稱PLC）已經(jīng)越來越多地應(yīng)用于工業(yè)控制系統(tǒng)中，并且在自動控制系統(tǒng)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(chǎn)廠家的各種類型PLC，它們各有優(yōu)缺點，能夠滿足用戶的各種需求，但在形態(tài)、組成、功能、網(wǎng)絡(luò)、編程等方面各不相容，沒有一個統(tǒng)一的標準，無法進行橫向比較。下面提出在自動控制系統(tǒng)設(shè)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(chǎn)品。
這一點尤為重要。在自動控制系統(tǒng)設(shè)計之初，就應(yīng)該對控制點數(shù)（數(shù)字量及模擬量）有一個準確的統(tǒng)計，這往往是選擇PLC的首要條件，一般選擇比控制點數(shù)多10%~30%的PLC。這有幾方面的考慮：
1、可以彌補設(shè)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(shù)的需要。
工作環(huán)境是PLC工作的硬性指標。自控系統(tǒng)將人們從繁忙的工作和惡劣的環(huán)境中解脫出來，就要求自控系統(tǒng)能夠適應(yīng)復(fù)雜的環(huán)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(yīng)實際工作環(huán)境的產(chǎn)品。
ALLEN BRADLEY 150-A54NCD 150A54NCD
ALLEN BRADLEY 1400-PD52A 1400PD52A
Allen Bradley 1394-SJT10-T-RL /A GMC Turbo System Module 380/460V AC 10kW
Allen Bradley 1394C-SJT05-D Ser C 5KW F/W V1.053 SYSTEM MODULE DIGITAL SERVO CON
Allen Bradley 1394C-SJT05-A Ser C 5KW F/W V7.01 SYSTEM MODULE DIGITAL SERVO CONT
ALLEN BRADLEY 1391-DES15-DI-AQB AC SERVO CONTROLLER * NO BOX*
Allen Bradley 1391B-ESAA22-AQB
Allen Bradley 1391B-AA45 Series D, AC Servo Controller - 90 Day Warranty
ALLEN BRADLEY 1391B-AA15 1391BAA15 1391 AB SERVO DRIVE 1 YEAR WARRANTY
Allen Bradley 1387-B-COB145-S21-B DC Drive (Inv.31112)
ALLEN BRADLEY 1336-SN-SP16A 1336SNSP16A
ALLEN BRADLEY 1336-SCR-SP9A 1336SCRSP9A
ALLEN BRADLEY 1336-SCR-SP15A 1336SCRSP15A
ALLEN BRADLEY 1336S-C100-AN-EN4-HA2-L6 AC DRIVE 100HP ***XLNT***
ALLEN BRADLEY 1336S-BRF100-AN-EN4-L6 1336SBRF100ANENA
allen bradley 1336S-B075-AN-HA1-L5 75hp ac drive 380v 480v 460v 400V 75 HP
ALLEN BRADLEY 1336S-B040-AN-EN5 SERIES E DRIVE **
ALLEN BRADLEY 1336S-B040-AN-EN 40HP 460V 1336 REMAN
ALLEN BRADLEY 1336S-B020-AA-EN3-HA2-L6 1336SB020AAEN3HA
ALLEN BRADLEY 1336F-CWF150-AN-EN **
allen bradley 1336f-brf20-aa-en-has2-l5 series b In Box
ALLEN BRADLEY 1336F-BRF200-AA-EN-HCS2-L4E 1336FBRF200AAEN1
ALLEN BRADLEY 1336F-BRF150-AA-EN-GMS6 1336FBRF150AAEN1
ALLEN BRADLEY 1336F-BF10V-AA SERIES A DRIVE * OUT OF BOX*
ALLEN BRADLEY 1336F-B020-AN-EN-HASP-L6 SERIES A AC DRIVE (AS PICTURED) **
ALLEN BRADLEY 1336F-A007-AA EN-HASP-L5 1336FA007AAENHAS
ALLEN BRADLEY 1336-C015-EAE-L3-SI 1336C015EAEL3SI
ALLEN BRADLEY 1336-BDB-SP5C -FS- 1336BDBSP5C
ALLEN BRADLEY 1336-B020-AA-EN-HAS1-L6 DRIVE 20HP 460VAC/60HZ 3PHASE * NO BOX*
ALLEN BRADLEY 1336-B010S-ECD-L3-RP3 **
Allen Bradley 1336 Plus Drive 15 HP 1336S-B015CAJ-CF-DS-JH2C Type 12 Enclosure
ALLEN BRADLEY 1334-DJB 1334DJB
ALLEN BRADLEY 1327AB-AFL-15-E 1327ABAFL15E
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
2711E-T14C6 ALLEN BRADLEY MONITORS CRT REMANUFACTURED
1785-L86B /E Allen Bradley PLC 5 Processor 1785L86B 163G
1394-SJT05-C-RL ALLEN BRADLEY 1394 5KW SYSTEM MODULE
1391-DES22-DI-AQB ALLEN BRADLEY DRIVES REMANUFACTURED
** 1756-L72 /A Ser A Allen Bradley ControlLogix Logix5572 Processor WARRANTY
* SEALED* 2014! 2711P-T10C4A8 /A Allen Bradley PanelView Plus 1000 AC
* 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