1)開關(guān)量的開環(huán)控制
開關(guān)量的開環(huán)控制是PLC的基本控制功能。PLC的指令系統(tǒng)具有強大的邏輯運算能力，很容易實現(xiàn)定時、計數(shù)、順序(步進(jìn))等各種邏輯控制方式。大部分PLC就是用來取代傳統(tǒng)的繼電接觸器控制系統(tǒng)。
(2)模擬量閉環(huán)控制
對于模擬量的閉環(huán)控制系統(tǒng)，除了要有開關(guān)量的輸入輸出外，還要有模擬量的輸入輸出點，以便采樣輸入和調(diào)節(jié)輸出實現(xiàn)對溫度、流量、壓力、位移、速度等參數(shù)的連續(xù)調(diào)節(jié)與控制。目前的PLC不但大型、中型機具有這種功能外，還有些小型機也具有這種功能。
(3)數(shù)字量的智能控制
控制系統(tǒng)具有旋轉(zhuǎn)編碼器和脈沖伺服裝置(如步進(jìn)電動機)時，可利用PLC實現(xiàn)接收和輸出高速脈沖的功能，實現(xiàn)數(shù)字量控制，較為先進(jìn)的PLC還專門開發(fā)了數(shù)字控制模塊，可實現(xiàn)曲線插補功能，近來又推出了新型運動單元模塊，還能提供數(shù)字量控制技術(shù)的編程語言，使PLC實現(xiàn)數(shù)字量控制更加簡單。
(4)數(shù)據(jù)采集與監(jiān)控
由于PLC主要用于現(xiàn)場控制，所以采集現(xiàn)場數(shù)據(jù)是十分必要的功能，在此基礎(chǔ)上將PLC與上位計算機或觸摸屏相連接，既可以觀察這些數(shù)據(jù)的當(dāng)前值，又能及時進(jìn)行統(tǒng)計分析，有的PLC具有數(shù)據(jù)記錄單元，可以用一般個人電腦的存儲卡插入到該單元中保存采集到的數(shù)據(jù)。PLC的另一個特點是自檢信號多．利用這個特點，PLC控制系統(tǒng)可以實現(xiàn)白診斷式監(jiān)控，減少系統(tǒng)的故障，提高系統(tǒng)的可靠性。
GE FANUC IC3600A0A IC3600A0A
GE FANUC 193X717ACG01 193X717ACG01
FOXBORO P0961FX P0961FX
FOXBORO E20S-V2FB6 E20SV2FB6
FOXBORO E20S-I2FB6 E20SI2FB6
FOXBORO 130M-N5/ECRB 130MN5ECRB
FOXBORO 130M-N5 130MN5
FILTER PUMP IND 8C-5C 8C5C
FANUC A06B-0642-B012 A06B0642B012
FANUC A06B-0583-B041 A06B0583B041
FANUC A06B-0501-B501 A06B0501B501
FANUC A06B-0310-B351 A06B0310B351
FANUC A06B-0128-B577 A06B0128B577
FANUC A06B-0127-B675 A06B0127B675
ENDRESS & HAUSER 93WA1-BA1A20RCBAAA 93WA1BA1A20RCBA1
ENCODER PRODUCTS 725N6000QOC1FNEY 725N6000QOC1FNEY
DIGITAL COMPUTER 5016017-01-D1-P3D1P3
CUTLER HAMMER SVX025A1-4A1B1 SVX025A14A1B1
CUTLER HAMMER SPD200480Y3K SPD200480Y3K
CUTLER HAMMER PUM-1 PUM1
CUTLER HAMMER HLD3600 HLD3600
CUTLER HAMMER DH425FGK DH425FGK
CUTLER HAMMER CB4033T120K480 CB4033T120K480
CUTLER HAMMER A900M2DAC A900M2DAC
CONTROL TECHNIQUES V7500ICD V7500ICD
CONTROL TECHNIQUES SPMD1604M SPMD1604M
COMPUMOTOR DRM21008B115 DRM21008B115
COGNEX IS5100-00 IS510000
COGNEX 800-5870-1-A 80058701A
COGNEX 800-5870-1 80058701
CARRIER HK50AA021 HK50AA021
BONITRON M3452-H600K6 M3452H600K6
BAYSIDE RA142-015-LB RA142015LB
BANNER ENGINEERING P4COR P4COR
BALDOR ZD18H-460-EO ZD18H460EO
BAILEY CONTROLS 6637446A 6637446A
BAILEY CONTROLS 6637033A4 6637033A4
BAILEY CONTROLS 6637033A2 6637033A2
AVTRON 630267 630267
ASEA BROWN BOVERI YT221001-LS YT221001LS
ASEA BROWN BOVERI YB560103-AC/8 YB560103AC8
ASEA BROWN BOVERI SR4313150R23C2EC1AB SR4313150R23C2EC
ASEA BROWN BOVERI DCF504-0050 DCF5040050
ASEA BROWN BOVERI ACS800-U1-0120-5+E202+L500+L502+P901 ACS800U101205E20
ASEA BROWN BOVERI 52614759 52614759
ARO 93970317 93970317
ALLEN BRADLEY 8600AT-MC/TC-CNC-DEMO2 8600ATMCTCCNCDE1
ALLEN BRADLEY 8520-1S10A-BAT-EX4-T1-Y-4-5-7 85201S10ABATEX4T
ALLEN BRADLEY 8500-A1D-K1B 8500A1DK1B
ALLEN BRADLEY 6181F-17TPXPH 6181F17TPXPH
ALLEN BRADLEY 6180-ADIDCFBCCZZ 6180ADIDCFBCCZZ
ALLEN BRADLEY 6170-DBCD1Z1EBZZA 6170DBCD1Z1EBZZA
ALLEN BRADLEY 5250-LP1 5250LP1
ALLEN BRADLEY 513-EABD-50 513EABD50
ALLEN BRADLEY 4100-212-P 4100212P
ALLEN BRADLEY 3500-AIO 3500AIO
ALLEN BRADLEY 2711-TC1 2711TC1
ALLEN BRADLEY 2711-T10C8L1 2711T10C8L1
ALLEN BRADLEY 2711-T10C20L1 2711T10C20L1
ALLEN BRADLEY 2711P-B15C6B2 2711PB15C6B2
ALLEN BRADLEY 1785-LT3 1785LT3
ALLEN BRADLEY 1785-L40L 1785L40L
ALLEN BRADLEY 1772-LP3D4 1772LP3D4
ALLEN BRADLEY 1771-PM 1771PM
ALLEN BRADLEY 1771N-0NNTTTTTT 1771N0NNTTTTTT
ALLEN BRADLEY 1771-IFF 1771IFF
ALLEN BRADLEY 1747-OCEDEBA 1747OCEDEBA
ALLEN BRADLEY 1392-B100-RK-MC-B-F2 1392B100RKMCBF2
ALLEN BRADLEY 1391-DES45-DI-AQB-A 1391DES45DIAQBA
ALLEN BRADLEY 1391-DES22-DI-AQB 1391DES22DIAQB
ALLEN BRADLEY 1336VT-B060-EAS-L3 1336VTB060EASL3
ALLEN BRADLEY 1336S-B020-AA-EN4-HA2-L6 1336SB020AAEN4H2
ALLEN BRADLEY 1336S-B020-AA-EN3-HA2-L6 1336SB020AAEN3HA
ALLEN BRADLEY 1336F-BRF200-AN-EN-L5 1336FBRF200ANENL
ALLEN BRADLEY 1336F-BRF200-AE-EN-L5 1336FBRF200AEENL
ALLEN BRADLEY 1334-FOB-K8W1 1334FOBK8W1
ALLEN BRADLEY 1334-FOB 1334FOB
ALLEN BRADLEY 1327AA-AC-05-B 1327AAAC05B
ALLEN BRADLEY 1326AB-B740C-21-L 1326ABB740C21L
ALLEN BRADLEY 1326AB-B730E-S2L 1326ABB730ES2L
ALLEN BRADLEY 1326AB-B420H-S2K4L 1326ABB420HS2K4L
ALLEN BRADLEY 1326AB-A530E-21 1326ABA530E21
ADEPT TECH 10332-00716
AC TECHNOLOGY M34400B M34400B