箱體式的PLC還有I/O拓展箱體，它不含CPU，僅有電源及I/O單元的功用。拓展箱體也依I/O點(diǎn)數(shù)的多少區(qū)分有不一樣的標(biāo)準(zhǔn)。
除上述模塊，PLC還有特別的或稱(chēng)智能或稱(chēng)功用模塊。如A/D（模入）模塊、D/A（模出）模塊、高速計(jì)數(shù)模塊、位控模塊、溫度模塊等等。這些模塊有自個(gè)的CPU，可對(duì)信號(hào)作預(yù)處理或后處理，以簡(jiǎn)化PLC的CPU對(duì)雜亂的程操控量的操控。智能模塊的品種、特性也大不一樣，功用好的PLC，這些模塊品種多，功用也罷。
通訊模塊，它接人PLC后，可使PLC與核算機(jī)，或PLC與PLC進(jìn)行通訊，有的還可完結(jié)與其它操控部件，如變頻器、溫控器通訊，或構(gòu)成有些網(wǎng)絡(luò)。通訊模塊代表PLC的組網(wǎng)才干，代表著當(dāng)今PLC功用的首要方面。
把握PLC功用，必定要了解它的模塊，并經(jīng)過(guò)了解模塊的功用，去澄清楚PLC的功用。
除了模塊，PLC還有外部設(shè)備。
盡管用PLC完結(jié)對(duì)體系的操控可不必外部設(shè)備，裝備好適宜的模塊就行了。但是，要對(duì)PLC編程，要監(jiān)控PLC及其所操控的體系的作業(yè)狀況，以及存儲(chǔ)用戶程序、打印數(shù)據(jù)等，就得運(yùn)用PLC的外部設(shè)備。故一種PLC的功用怎么，與這種PLC所具外部設(shè)備豐厚與否，外部設(shè)備好用與否直接有關(guān)。

KEBA AR-181
KEBA CU312/E
KEBA CU313
KEBA CU313
KEBA CU313A
KEBA DI325
KEBA DI325
KEBA DI325
KEBA DO321
KEBA DO321
KEBA DO321
KEBA DO321/B
KEBA EC100S
KEBA PS244
KEBA SI232
KEBA TT 081  02203-7614
KENSINGTON WFH4C
KEPCO 4882-27
KEPCO BOP20-20M
KEYENCE ML-P2
KIDDE FENWAL 12-E27121-020-05
KNIEL CP15.6311-052-02
KOGANEI CS4HB
MOTOROLA MVME5100
MOTOROLA MVME5500
MOTOROLA MVME712/M
MOTOROLA MVME712M
MOTOROLA TMCP700 W33378F
MOTOROLA XVME-674
MOTOROLA XVME-957
MOTOROLA MVME147-013
MOTOROLA MVME162PA-344E
MOX MX603-0308-613
M-SYSTEM MD2202-D32-X-P
MTL 2213
MYKROLIS FC-280SAV
NACHI BUY222
NAICH AUX111
NATIONAL INSTRUMENTS SCXI-1163R
NATIONALA MM-4M-R
Natural?MicroSystems?NMS CG6500C 8E1/8T1 背板
NEC 136-551733-B-02
NEC 136-551735-D-04
NEC 136-551973-A-01   1月26日
NEC 136-553623-A-01
NEC FC  9821X
NEC FC-9821X
NEC G8NXAA5G
NEC NEC風(fēng)扇
NEC PC-9821XB10
NEC PU-S24
NEC RSA-983/D
NEC SC-UPCIN-3
NI PCI-6031E
NI SCXI-1100
NI SCXI-1100
NI SCXI-1126
NIKON KBA-00650 4S007-320-A LC-SIG4
NMB-MAT 2410ML-05W-B50
NMS CG6060/32-4TE1
NOVELLUS 02-113640-00
OBERG INDUSTRIES F-DMDM-PM-110E
OKUMA ER-FC-2048D
OLEC 64VB412V02
OLYMPUS OTV-S7H-NA-12E
OMRON C200HG PA204S
OMRON C200H-ID217
OMRON C200H-OD219
OMRON C200HW-BC031
OMRON C200HW-NC113
OMRON E2G-M18KN10-WS-C1 2M
OMRON F350
OMRON F350-CEOV2
OMRON H3CR-A8E
OMRON HL-5000
OMRON HL-5030
OMRON MY-4J
ONLINE 56SAM-NEX
OPTIMATE OM1510
OPTIMATE OP-620
OPTO 22 SNAP-AITM-2
OPTO 22 SNAP-IDC5D
OTHER/其他 白棉
oxboro E69F-BI2-MS
OXIDE 0020-31655
PACFFFC PC832-001-T
PACIFIC SCIENTIFIC PC832-001-N
PACIFIC SCIENTIFIC T60-1001-C8-1A
PALCLEAN JD-BXG
PAPST TYP7114N/2
PARKER XPR10VT-4P3
PCCOOLER/超頻三 CPU風(fēng)扇
PELCO PA30-0065-00-A1
PHILIPS PR1613
PHOENIX FLMC10BASE-T/FO G850
PHOENIX HDFK4
PHOENIX IBS 24BK-I/O-T
PHOENIX PLC-BSC-24DC/21
PHOENIX QUINT PS-100-240AC/24DC/10
PHOENIX QUINT-PS-100-240AC/10
PHOENIX QUINT-PS-100-240AC/24DC/10
PHOENIX ST-SI-UK4
PHOENIX ST-SI-UK4
PHOENIX UK3N
PHOENIX UK4-T
PHOENIX UK6N
PHOENIX UT 4-HE SI
PHOENIX UT 4-MTD
PHOENIX UT 6-HE SI
PHOENIX IBS PCI SC/I-T
PILLAR INDUSTRIES AB7006-1
PILZ P1U-1NB
PILZ PZE3 V22 24VDC
PIONEER MAGNETICS PM1253AL-6-3-Z03
POLYSPEDE PRD2-200
POTTER&BRUMFIELD SDAS-01-7Y2S1024
POWER-ONE MAP55-1024
PROSOFT 1454-9F
PROSOFT 5601-RIO-MCM
Prosoft MVI56E-MCMR
PROSOFT MVI56-GSC
PROSOFT MVI69-PDPMV1
PROTECH SYSTEMS PBI-6SA
PRT PSA300R-81
PRT PSA300R-PFC
RADISYS EPC-16
RADISYS EPC-5 w/ EXM-13
RADISYS EXP-MX200
RELIANCE 0-51378-25
RELIANCE 0-56966-2
RELIANCE 0-57510
RELIANCE 0-57C400-A
RELIANCE 0-57C401-2
RELIANCE 0-57C402-C
RELIANCE 0-57C404-1E
RELIANCE 0-57C405-C
RELIANCE 0-57C406-E
RELIANCE 0-57C407-4H
RELIANCE 0-57C408-B
RELIANCE 0-57C411-2
RELIANCE 0-60002-6
RELIANCE 0-60010-E
RELIANCE 0-60031-5
RELIANCE 45C220B
RELIANCE 57C404C
RELIANCE 57C404C
RELIANCE 57C435
RELIANCE 803.65.00 BOARD
RELIANCE 805405-1R
RELIANCE DSA-MTR-600
RELIANCE E243
RELIANCE E372-013-404
RELIANCE F-4030-O-H00AA
RELIANCE H2310240032X512
RELIANCE S240-1A8
RELIANCE ELECTRIC 57C431
RELIANCE ELECTRIC 57C493
RELIANCE ELECTRIC WR-D4004
REXROTH 0608 801 006
REXROTH 608701018
REXROTH 608720040
REXROTH 608720040
REXROTH 608800048