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①平均故障間隔時(shí)間長(zhǎng)
②故障修復(fù)時(shí)間（平均修復(fù)時(shí)間）短
任何電子設(shè)備產(chǎn)生的故障，通常為兩種：
①偶發(fā)性故障。由于外界惡劣環(huán)境如電磁干擾、超高溫、超低溫、過(guò)電壓、欠電壓、振動(dòng)等引起的故障。這類(lèi)故障，只要不引起系統(tǒng)部件的損壞，一旦環(huán)境條件恢復(fù)正常，系統(tǒng)也隨之恢復(fù)正常。但對(duì)PLC而言，受外界影響后，內(nèi)部存儲(chǔ)的信息可能被破壞。
②性故障。由于元器件不可恢復(fù)的破壞而引起的故障。
如果能限制偶發(fā)性故障的發(fā)生條件，如果能使PLC在惡劣環(huán)境中不受影響或能把影響的后果限制在*小范圍，使PLC在惡劣條件消失后自動(dòng)恢復(fù)正常，這樣就能提高平均故障間隔時(shí)間；如果能在PLC上增加一些診斷措施和適當(dāng)?shù)谋Ｗo(hù)手段，在性故障出現(xiàn)時(shí)，能很快查出故障發(fā)生點(diǎn)，并將故障限制在局部，就能降低PLC的平均修復(fù)時(shí)間。為此，各PLC的生產(chǎn)廠商在硬件和軟件方面采取了多種措施，使PLC除了本身具有較強(qiáng)的自診斷能力，能及時(shí)給出出錯(cuò)信息，停止運(yùn)行等待修復(fù)外，還使PLC具有了很強(qiáng)的抗干擾能力。STAHL ET-125-RS422 現(xiàn)貨
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AS-HDTA-200C
AS-HDTA-201
AS-HDTA-201C
AS-HDTA-202
AS-HDTA-202C
AS-MBKT-0
AS-MBKT-185
AS-MBPL-001
AS-MEEP-000
AS-P120-000
AS-P120-125
AS-WBXT-201
AS-BADU-206
AS-BADU-210
AS-BADU-211
AS-BADU-212
AS-BADU-214
AS-BADU-216
AS-BADU-254
AS-BADU-254C
AS-BADU-256
AS-BADU-256C
AS-BADU-257
AS-BADU-257C
AS-BBKF-201
AS-BBKF-202
AS-BCTR-205
AS-BCTR-212
AS-BCTR-224
AS-BDA0-216
AS-BDAP-204
AS-BDAP-208
AS-BDAP-210
AS-BDAP-211
AS-BDAP-212
AS-BDAP216N
AS-BDAP-217
AS-BDAP-218
AS-BDAP-220
AS-BDAP-250
AS-P810-010
AS-P830-000
AS-P840-000
AS-P890-000
AS-P890-300
AS-P892-000
AS-P965-000
AS-S908-000
AS-S908-001
AS-S908-011
AS-S908-012
AS-S908-021
AS-S908-110
AS-S908-111
AS-S911-000
AS-S911-001
AS-S911-003
AS-S911-800
AS-S911-801
AS-S985-802
AS-W801-006
AS-W804-012
AS-W808-002
AS-W808-006
AS-W956-012
AS-W956-025
AS-WBXT-201
170MCI00700 NEW SEALED Modicon Interbus-S Conn 170-MCI-...
ASBDAU204 NEW Modicon Compact Analog OUT AS-BDAU-204
140CPU67160 Used REfurbished Modicon CPU 140-CPU-671-60
ASBADU206 NEW Modicon Compact Analog Input AS-BADU-206
140CPU43412A Excellent Tested Modicon CPU 140-CPU-434-1...
ASBDEP220 Used Guaranteed Modicon Discreet Input AS-BDE...
140CPS11420 NEW Modicon AC Power Sply 140-CPS-114-20
140CRA93100 Modicon Quantum RIO Drop 140-CRA-931-00
490NRP95400 FACTORY NEW Modicon Fiber Repeater 490-NRP-...
Modsoft Compact Modicon Programming Software
140CPU53414A Used Excellent Modicon CPU 140-CPU-534-14A
ASBDEP216 Used Modicon 16 Discreet IN AS-BDEP-216
140DDO84300 Used Modicon DC Out Source 140-DDO-843-00
140DDI85300 TESTED and Guaranteed Excellent Modicon DC ...
ASB875002 TESTED EXCELLENT Modicon Analog INPUT Module ...
170AAI03000 TESTED and GUARANTEED Modicon Momentum Anal...
140CRP93200 Used TESTED Modicon RIO HEAD Module 140-CRP...
ASBDAU202 TESTED Modicon / Schneider Analog Output Modu...
TWDLCAA24DRF Modicon Schneider Telemecanique Twido Modu...
140CPU43412A NEW Sealed Modicon CPU 140-CPU-434-12A
ASBADU206 Used TESTED and GUARANTEED Modicon Compact An...
ASBDAU204 NEW ORIGINAL BOX Modicon Compact Analog OUT A...
PC-E984-265 NEW Modicon Compact CPU PCE984265
ASB875111 Modicon Analog Input Module AS-B875-111
AS-BDAP-204 NEW SEALED Modicon Compact Out ASBDAP204
140EHC20200 Used Modicon High Speed Ctr 140-EHC-202-00
Item title
140XTS00200 NEW Modicon Quantum Term 140-XTS-002-00
140DRA84000 NEW Modicon Relay OUT 140-DRA-840-00
140DDI36400 Used Modicon DC In Module 140-DDI-364-00
140NOE77101 Modicon NEW FACTORY SEALED Ethernet 140-NOE...
140DRA84000 NEW FACTORY SEALED Modicon Relay OUT 140-DR...
PCE984385 Used GUARANTEED Modicon Slot Mount CPU PC-E98...
140EHC20200 NEW Modicon High Speed Ctr 140-EHC-202-00
140DAI55300 NEW SEALED Modicon Quantum AC IN 140-DAI-55...
140XBP00600 Modicon Quantum 6 Slot Back 140-XBP-006-00
140CPU65150 NEW FACTORY Sealed Modicon CPU 140-CPU-651-...
170AMM09000 Used Tested Modicon Momentum 170-AMM-090-00
140DDO35300 NEW SEALED Modicon DC Output 140-DDO-353-00
140NOE77111 Modicon Excellent Ethernet 140-NOE-771-11
PC-A984-130 Used Modicon Compact CPU PCA984130
140CPU53414B Used Excellent Modicon CPU 140-CPU-534-14B
AS8535000 Used Modicon Connector AS-8535-000
PCE984685 Used FULLY TESTED AND GUARANTEED Modicon Slot...
140ACI04000 USED EXCELLENT Modicon Analog IN 140-ACI-04...
140AVI03000 NEW Modicon Analog Input Module 140-AVI-030...
170CPS11100 Modicon NEW Momen Pwr Sply 170-CPS-111-00
416NHM21200 Used Modicon PCMCIA MB+ Adap 416-NHM-212-00
140DRA84000 NEW Factory Box Modicon Relay OUT 140-DRA-8...
140ARI03000 Used Modicon RTD IN 8CH 140-ARI-030-00
TSXASZ200 TESTED Modicon Micro Analog Output Module TSX...
170XTS00200 Modicon Momentum Spring Type Terminal 170-X...
140CPS11100 Used Modicon Power Supply 140-CPS-111-00
490NRP25400 Modicon Fiber Line Drop Repeater 490-NRP-25...
140CPU42402 Used TESTED Modicon Quan CPU 140-CPU-424-02
TSXP573634 Excellent Modicon Unity Premium CPU TSX-P574...
140AVO02000 Modicon Quantum Analog Out 140-AVO-020-00
Item title
ASM84A002 Perfect Modicon Controller Module AS-M84A-002
140ACO13000 NEW SEALED Modicon Analog OUT 140-ACO-130-0...
Speed Counter AS-BZAE-204
140XBP00600 BRAND NEW Modicon Quantum 6 Slot Back 140-X...
PCE984251 Excellent Modicon Compact CPU PC-E984-251
140CPU11303 NEW SEALED Modicon Quan CPU 140-CPU-113-03
AS8534000 NEW Modicon Connector AS-8534-000
PCO984785 PERFECT Modicon CPU PC-O984-785
DL1BDB3 Brand New Telemecanique LED Cluster Green
ASBDAP216N Modicon A120 IO DC OUT 16 pt AS-BDAP-216N
140DRC83000 NEW Modicon Relay OUT 140-DRC-830-00
ASBDAP216 NEW Modicon Compact Out Module AS-BDAP-216
110CPU51200 Modicon Micro Controller 110-CPU-512-00
170ENT11000 Used Excellent Modicon Momentum Ethernet Mo...
8020SCP401 SYMAX Modicon NEW Model 400 Processor 8020-S...
170ENT11002 Modicon Momentum Ethernet 170-ENT-110-02
8010CC106 NEW SqD PowerLogic Sy/Max Cable 8010-CC-106
AS-BZAE-204 Used Modicon High Speed Counter ASBZAE204
499NES18100 BRAND NEW SEALED Modicon ConneXium 8TX 10/1...
140CPU31110 NEW Modicon Unity CPU 140-CPU-311-10
PCL984785 EXCELLENT Modicon Slot Mount CPU PC-L984-785
171CCC98030 NEW SEALED Modicon CPU 171-CCC-980-30
140XCA71703 PERFECT Modicon Quantum 3' CABLE FOR EXPAND...
170ADO35000 Modicon DC Discreet I/O Base 170-ADO-350-00
STBDDO3600 Guaranteed Advantys 24VDC Out 6pt Source Tel...
170ADM35011 Modicon Momentum I/O Base 170 ADM 350 11
140CPU11302 NEW Sealed Modicon QuanCPU 140-CPU-113-02
TSXCBY010 Modicon Premium Cable TSX-CBY-010
ASB371001 Modicon BCD Register Input Module AS-B371-001
990NAD21130 New Modicon MB+ Cable 990-NAD-211-30
ASBDEP256 NEW Modicon Compact Discreet Input AS-BDEP-2...
140CPS12420 EXCELLENT CONDITION Modicon Power Supply 14...
140DAO85300 New SEALED Modicon AC Out Module 140-DAO-85...
170ADI35000 NEW Modicon DC I/O Base 170-ADI-350-00
ASBDEP218 NEW Modicon 16 Pt 115VAC AS-BDEP-218
AS-BADU-205 Modicon Compact Analog Input ASBADU205
140DAO84000 Used Excellent Modicon Quan AC OUT 100 140-...
TSX3722101 TESTED Modicon Micro Base Module TSX-3722101
TSXETY4103 BRAND NEW Modicon Premium TCP/IP Module TSX-...
TSXMRP032P Schneider Modicon Ram Memory Card Used TSX-M...
AS-BDEP-209 Used Modicon Compact AC IN Module ASBDEP209
140CPS22400 Modicon Power Supply 140-CPS-224-00
TSXMRPC001M Modicon Premium SRAM Memory TSX-MRPC-001M
TSX3721001 TESTED Modicon Micro Base Module TSX-3721001
TSXDSY32T2K NEW Modicon Premium Output TSX-DSY-32T2K
XVBC02 Brand New Telemecanique Black Tube
140XTS00203 Used 3' Modicon Cablefast 140-XTS-002-03
ASBDAP220 BRAND NEW Modicon Discreet Input/Output Combi...
170PNT11020 Used Excellent Modicon Momentum IECModule 1...
ASBDEP215 Used Modicon INPUT MODULE 16 POINT 5V TTL AS-...
ASB231 ASB231001 Used Modicon Input Module AS-B231-001
ASB248 ASB248501 Used Modicon Output Module AS-B248-501
TSXSAY100 Used Modicon Premium AS I Module TSX SAY 100
140ERT85400 Modicon NEW Smart DC In 140-ERT-854-00
140DAI54300 NEW FACTORY SEALED Modicon Quantum AC IN 14...
170BDI54250 Used Tested Modicon Momentum 170-BDI-542-50
ASB232501 Used Modicon Output Module AS-B232-501
ASW808002 Excellent Modicon Cable Assembly AS-W808-002
140CFG01600 BRAND NEW Modicon Cablefast 140-CFG-016-00
ASB231 ASB237001 Used Modicon Input Module AS-B237-001
ASM84A001 Gould Modicon Controller AS-M84A-001
13-4616-10 Gould Modicon Waveform Storage Module 13461...
499NES18100 NEW Modicon / Schneider ConneXium 8TX 10/10...
ET-125-RS422
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