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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還有特別的或稱智能或稱功用模塊。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
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KEBA DO321
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KEPCO 4882-27
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KEYENCE ML-P2
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MOTOROLA MVME5100
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MTL 2213
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NACHI BUY222
NAICH AUX111
NATIONAL INSTRUMENTS SCXI-1163R
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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
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NEC FC-9821X
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NOVELLUS 02-113640-00
OBERG INDUSTRIES F-DMDM-PM-110E
OKUMA ER-FC-2048D
OLEC 64VB412V02
OLYMPUS OTV-S7H-NA-12E
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OXIDE 0020-31655
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PHOENIX QUINT-PS-100-240AC/24DC/10
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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
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RELIANCE 0-57510
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RELIANCE 0-57C402-C
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