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 為了便于故障的及時解決，首先要區分故障是全局性還是局部性的，如上位機顯示多處控制元件工作不正常，提示很多報警信息，這就需要檢查CPU模塊、存儲器模塊、通信模塊及電源等公共部分。如果是局部性故障可從以下幾方面進行分析。 

   1．根據上位機的報警信息查找故障。PLC控制系統都具有豐富的自診斷功能，當系統發生故障時立即給出報警信息，可以迅速、準確地查明原因并確定故障部位，具有事半功倍的效果，是維修人員排除故障的基本手段和方法。

   2．根據動作順序診斷故障。對于自動控制，其動作都是按照一定的順序來完成的，通過觀察系統的運動過程，比較故障和正常時的情況，即可發現疑點，診斷出故障原因。如某水泵需要前后閥門都要打開才能開啟，如果管路不通水泵是不能啟動的。

   3．根據PLC輸入輸出口狀態診斷故障。在PLC控制系統中，輸入輸出信號的傳遞是通過PLC的I/O模塊實現的，因此一些故障會在PLC的1/0接口通道上反映出來，這個特點為故障診斷提供了方便。如果不是PLC系統本身的硬件故障，可不必查看程序和有關電路圖，通過查詢PLC的I/O接口狀態，即可找出故障原因。因此要熟悉控制對象的PLC的I/O通常狀態和故障狀態。
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鄭娟萍

廈門仲鑫航自動化設備有限公司  

   4．通過PLC程序診斷故障。PLC控制系統出現的絕大部分故障都是通過PLC程序檢查出來的。有些故障可在屏幕上直接顯示出報警原因；有些雖然在屏幕上有報警信息，但并沒有直接反映出報警的原因；還有些故障不產生報警信息，只是有些動作不執行。遇到后兩種情況，跟蹤PLC程序的運行是確診故障的有效方法。對于簡單故障可根據程序通過PLC的狀態顯示信息，監視相關輸人、輸出及標志位的狀態，跟蹤程序的運行，而復雜的故障必須使用編程器來跟蹤程序的運行。如某水泵不工作，檢查發現對應的PLC輸出端口為0，于是通過查看程序發現熱水泵還受到水溫的控制，水溫不夠PLC就沒有輸出，把水溫升高后故障排除。

Dell SCSI Controller 00014550 Series 466 Rev B SCSI-4 SCSI-3 16MB PCI In i960

Dell SCSI Controller AAC-9000MD 0004351P Rev A02 2x SCSI-3 4x SCSI-4 Adaptec

IBM xSeries 335 336 Hot Swap Backplane Platine Board 2xSCSI 02R0950 32P1932

HP ProLiant ML370 G2 SCSI RAID Controller 32MB 011003-004 Ultra3 233609-001

HP ProLiant BL25p BL20p G3 Backplane 371701-001 WF2903003001 1305A0039801

HP Proliant DL740 RAID Controller Smart Array 6402 309520-001 2xSCSI-3 011784

HP ProLiant BL20p G3 BL25p G1 SCSI Controller 128MB 385836-001 320MB/s 355895

AMI Mega RAID Ultra-Series 428 SCSI Dell 4230C PCI FL02

In D1305-R12 GS 4 SCSI Controller PRIMERGY ECONEL 40 50 100 200 200-2 NEU

In D1305-R12 GS 4 SCSI Controller W26361-D1305-Z1-03-36 SCSI-3 1XU160 INT NEU

Adaptec U160 10600204508 RAID SCSI Controller 3000S 32MB LVD/SE HD68f 2CH NEU

Adaptec RAID SCSI Controller 64MB FSC Primergy RX200 RX300 TX150 TX200 TX300 NEU

Dell 07F134 7F134 RAID Controller Poweredge 1650 BR4

Adaptec U320 RAID SCSI Controller ASR-2010S 64MB SCSI-3 AIC-7902W LVD/SE NEU

Intergraph CINF0390A UW SCSI RAID Controller 2ch BR03

Dell Poweredge 2500 Adaptec 39160 Controller 160MB/s 0360MG 3892B365 1817207-00

HP zx2000 Itanium2 Intergrity RX2600 SCSI Controller SCSI-3 PCI-X LSI8955-66

Backpanel BA41-00245A BA41 00245A 6SCSI 80p SR2200 A56188-303 A56188-305 A56188

Mylex AcceleRAID 160 A160-1-16NB-FSC1 U160 SCSI RAID Controller PCI 68-pin 68p

Dell 0J4588 PERC 4 SCSI RAID Controller für Poweredge 1600SC 1850 2600 2650 6650

Adaptec U160 10600204508 RAID SCSI Controller 3000S 32MB LVD/SE HD68f PCI-X 64b

HP ProLiant DL380 G4 DL385 G1 Backplane HP 411023-001  012055-502

Symbios SYM22802 SCSI Controller PCI LSI 53C876 2xSCSI-3 2xLVD/SE extern  

Adaptec 2100S Ultra160 SCSI 68pin RAID 32MB Ai11 AL NEU

Compaq Server Feature Board 163355-001 2xSCSI VGA LAN [R31]

Compaq SCSI Controller Ultra160 SCSI 160MBps 143886-001

Adaptec ASR-2120S 2120S 64MB SCSI Controller 68-pin 68p RAID PCI-X 64bit PCI X

IBM 06P5741 SCSI 68pol intern 68pin extern Controller 32 MB PCI-X SCSI Ultra160

10 Stück Maxtron Wechselrahmen SCSI VP-20LSF NEU

Compaq 400546-001 400546 001 SCSI RAID Controller SCSI 160MB/s Proliant ML350

Adaptec 2100S Ultra160 SCSI RAID Controller 160MBps 32MB SDRAM 68-pin PCI 32bit

Smart Array 2DH UW SCSI CPQ 295243-001 Proliant PL1600

Adaptec AHA-2940 AHA 2940 AHA2940 50-pin SCSI Controller 1x intern 1x extern PCI

FSC D1305-A12 D1305 W26361-D1305 SCSI Controller 68-pol 68pol PCI-X PCI X 64bit

FSC Primergy SCSI-3 Controller D1305-A12 GS4 S26361-D1305-A12-4-Z 10600236077

Mylex DAC960PRL SCSI 68-pin RAID Controller NEU

Mylex DAC960PRL SCSI 68-pin 68-pol RAID Controller In i960 PCI 32bit 32 bit

Adaptec AHA-2940UW AHA 2940 UW PCI 32 bit SCSI Controller 68-pin 50-pin 68p 50p

Adaptec AHA-2940AU AHA 2940AU AHA2940AU PCI SCSI Controller 20 MB/s 50-pol 50pin

5 Stück Maxtron Wechselrahmen SCSI VP-20LSF NEU

LSI SCSI Controller 128MB 2xU320 FSC CELSIUS R630 V830 PRIMERGY BX620 RX200 NEU

LSI A3C40080123 Rev C SCSI Controller 128MB für FSC TX150 TX200 TX300 TX600 NEU

LSI SCSI Controller 128MB FSC RX220 RX300 RX330 RX600 RX800 RXI300 RXI600 NEU

Mylex DAC 960PJ SCSI Raid 5 Anschlü?e inkl. 16 MB Q16

LSI A3C40080123 Rev C SCSI Controller 128MB 2xU320 5182011328-02M 2xSCSI-3 NEU

Adaptec AVA-2904 AVA 2904 AVA2904 SCSI Controller PCI Card SCSI 50-pin 50-pol

MYLEX DAC 960PD 960 PD RAID - inkl. 4MB CACHE Q16

2 Stück Maxtron Wechselrahmen SCSI VP-20LSF NEU

Maxtron VP-20LSF VP 20LSF Wechselrahmen HDD Tray SCSI 50-pin 50 pin OVP NEU

Quantum Superloader 3 LTO-3 L700 12,8TB / 25,6TB Autoloader EC-LF5WA-YF 16 slot

Fujitsu LTO3-EX1 23R4815 Bandlaufwerk extern LTO3 SCSI-3 400/800GB schwarz NEU

Quantum L700 Superloader 3 DLT-V4 DLT 2HE 16 Tapeslots EC-SF6WA-YF schwarz NEU

FSC 2123760 LTO 3 Bandlaufwerk A3C40067139 für MBK Wechsler 9084-221F-L3 FC NEU

Fujitsu Exabyte 221L 8.4TB 21x LTO Ultrium 2 200GB SCSI LVD 270020-1400 9084-221

FSC Fujitsu Siemens 9084-430 MBK Wechler 30SL Mammoth-2 Tape Autoloader NEU

FSC Fujitsu Siemens MBK Wechsler 9084-110 110L LTO Ultrium 1 SCSI 1TB / 2TB NEU

Fujitsu Siemens FSC 2125841 Fujitsu 8-00246-04 LTO2 2x SCSI 68-pin schwarz NEU

ADIC LTO200D 100/200 GB LTO-1 extern SCSI Streamer schwarz 8-00006-02 NEU

Tandberg Data SLR100 50/100GB Streamer Bandlaufwerk SLR-100 SCSI 68p beige NEU

Tandberg Data SLR100 50/100GB Streamer Bandlaufwerk SLR-100 SCSI 68-pin beige

Fujitsu 200/400GB LTO Streamer PRIMERGY SX10 TX200 S2 TX300 RACK TX600 S2 NEU

IBM T400-AN 24R0262 88030673 A3C40055000 200/400GB LTO Ultrium 2 Streamer NEU

Tandberg SLR75 SLR 75 38 / 75 GB Streamer Bandlaufwerk SCSI 68pin 8 MB beige NEU

Tandberg SLR100 S26361-H583-V200 82070487 50/100GB Streamer SCSI 68p schwarz NEU

Fujitsu Siemens 34001023 Fujitsu 8-00246-04 LTO2 Streamer Fibre Channel FC NEU

HP Ultrium LTO2 BRSLA-0404-DC PD040-10000 200/400GB Streamer Bandlaufwerk NEU

70-60420-26 40GB/80GB MBK-LW MBK LW DLT SCSI 68-pol 68 pol 68pol schwarz NEU

Ultrium LTO2 BRSLA-0404-DC 0404 200GB / 400GB Streamer SCSI 68-pin schwarz

Tandberg DLT8000 DLT 800 40/80GB Streamer Bandlaufwerk SCSI 68-pin schwarz NEU

Tandberg SLR140 SLR 140 70/140GB Streamer Bandlaufwerk 12MBps SCSI 68p beige NEU

Tandberg SLR140 SLR 140 70 / 140 GB Streamer 12 MBps SCSI 68-pol 68p schwarz NEU

Tandberg DLT VS80 40GB/80GB Streamer SCSI 68p Laufwerk 13,3cm (5.25") beige NEU

Seagate STU62001LW TC6200-041 TC6200-027 extern 100GB / 200GB schwarz +Zub NEU

Tandberg DLT VS 80e TDA1121-02 40/80GB externer Streamer LVD SCSI 68p beige NEU

ASM LTO2 UDS2 Streamer 200/400GB SCSI 68pin 8-00194-05

ASM LTO2 UDS2 Streamer 200/400GB SCSI 68pin 8-00194-05 FS81 NEU

HP EB630 BRSLA-05S2-DC BRSLA 05S2 80GB/160GB Streamer SCSI 68-pol schwarz NEU

Tandberg 1108 SLR100 50/100GB externer Streamer Autoloader SCSI 68-pol 68p beige

Tandberg SLR75 SLR 75 38GB / 75GB Streamer Bandlaufwerk SCSI 68p 8MB schwarz NEU

Tandberg DLT VS160 Tape Drive Streamer 80 160 GB SCSI 68-pol 68pol beige NEU

Tandberg SLR7 Streamer SCSI 68p 6620 schwarz Ai06 AL

Tandberg SLR100 50/100GB Streamer Bandlaufwerk 8 MB SCSI 68-pol 68p schwarz NEU

Tandberg DLT VS80 40GB / 80GB Streamer SCSI 68-pin Laufwerk 13,3cm (5.25") beige

ADIC DLT8000 Laufwerksmodul SCSI 40/80GB 96-5335-39 V43

Tandberg SLR60 SLR 60 30GB 60GB Streamer SCSI 68-pol 68pol 68 pol schwarz NEU

Tandberg DLTVS160 DLT VS160 80/160GB Streamer Bandlaufwerk SCSI 68p schwarz NEU

HP Hewlett Packard EB620T EB620T#250 36/72GB Bandlaufwerk SCSI 68-pol schwarz

HP Hewlett Packard EB620A EB620A#000 36/72GB Bandlaufwerk SCSI 68p schwarz NEU

HP C5713-00255 C5713 00255 A3C40012254 120/240GB Streamer SCSI 68p schwarz NEU

TANDBERG DATA SLR50 Streamer SCSI 68pin 25GB 50GB 13.3cm (5.25Zoll) schwarz NEU

Sony SDX-700C 100 / 260 GB Streamer SCSI 68p beige Ai18

Tandberg SLR60 30GB/60GB Streamer Bandlaufwerk SCSI 68p 68-pol 68 pol beige NEU

Tandberg SLR140 SLR 140 70 / 140 GB Streamer 12 MBps SCSI 68-pol 68pol schwarz

OnStream ADR50i 30GB 50GB ADR Streamer SCSI 68-pol 68 pol 68pol 2MB/s beige

Tandberg SLR75 SLR 75 38GB / 75GB Streamer Bandlaufwerk SCSI 68pol 8MB schwarz

HP C5683-00551 C5683-00260 20/40GB DDS-4 Streamer SCSI 68-pin 68p beige NEU

Quantum DLT7000 TH6AE-SO 35/70GB SCSI 68-pin schwarz Ai05 NEU

Tandberg Streamer DLT1 40/80 GB SCSI 68p  beige Ai18

Dell PowerVault 110T DLT VS160 08X850 80GB 160GB Streamer SCSI 68-pol schwarz

Tandberg DLTVS160 DLT VS160 80/160GB Streamer Bandlaufwerk SCSI 68-pol schwarz

Dell PowerVault 110T DLT VS 80 VS80 02T713 2T713 0T1452 40/80GB Streamer schwarz

HP C5683-00551 C5683 20GB/40GB DDS Streamer Bandlaufwerk SCSI 68-pol 68p beige

Tandberg Streamer SLR60 30/60 GB SCSI 68p beige Ai18 AL

Quantum DLTVS 80 24P2431 59P6682 40/80GB Streamer SCSI 68-pol Streamer schwarz

HP C5685C C5685-69204 DAT Streamer Bandlaufwerk DDS4 SCSI 68-pol 20GB/40GB beige

HP SureStore DAT40 C5686A C5686-69203 C 5686A 20 / 40 GB Streamer SCSI 68p beige

Dell DAT72 CD72LWH 36 GB / 72 GB DAT Streamer 0R3999 0DF675 SCSI 68-pol schwarz

HP SureStore DAT40i C5683-20260 C5683 20GB/40GB DDS Streamer SCSI 68-pol beige

Compaq TH3AA-HJ TH3AA HJ 242468-001 15 / 30 GB DLT Streamer SCSI 50-pin beige

Tandberg Panther 2400 TDC 4220 TDC4220 2.5/5GB SLR Streamer SCSI 50-pin beige

HP SureStore DAT40 C5686A C5686-60003 C 5686A 20GB/40GB

Quantum DLT4000 TH5AA-AZ 05448P 20 / 40 GB Streamer für Poweredge 2400 SCSI 50p

Seagate STD2401LW Bandlaufwerk DAT DDS4 20GB 40GB SCSI LVD E-H026-00-4395 (B)

Seagate DAT24 STD224000N 12/24GB Streamer Bandlaufwerk SCSI 50p 28L1652 schwarz

Quantum DLT4000 TH5AA-YF TH5AA YF 20 / 40 GB Streamer Tape Drive SCSI 50-pin

TTI DLT4000S CTS-2210-HP 10454000-HP externer 20GB/40GB Streamer SCSI 50p beige

Tandberg SLR5-LB SLR5 4GB / 8GB Streamer SCSI 50-pin beige 13,3cm (5.25 Zoll)

Seagate CTD8000H-S SBU25360-000 70000114-013 4/8GB DDS Streamer SCSI 50p schwarz

ADIC 9-01419-01 9 01419 01 Leer Geh?use für IBM 3592 Streamer SCSI 80p 25p NEU

Seagate DAT Scorpion 24 STD224000N 12/24GB Streamer Bandlaufwerk SCSI 50p beige

IBM eServer IC35L073UCDY10-0 IC35L073UCDY10 07N8812 32P0730 73.4 GB SCSI HDD

Seagate Cheetah 10K.6 ST373307LC 73 GB HDD Festplatte SCSI 80-pin 80 pin 80p

Seagate Cheetah 73 ST173404LCV 73GB SCSI 80-pol HDD Festplatte 10.000RPM 16MB

Fujitsu Enterprise MAS3184NC 18,4GB HDD Festplatte SCSI 80-pin 15.000RPM 8MB NEU

HP Surestore C1555B Bandlaufwerk SCSI DAT24i DDS3 12GB 24GB C1555-60003 Streamer

HP C1536-20100 C1536 20100 2 / 4 GB DDS-1 Streamer SCSI 50-pin 50p beige NEU

Hitachi Ultrastar IC35L073UCDY10-0 73.4 GB 10000U FS07

IBM eServer IC35L073UCDY10-0 IC35L073UCDY10 08K0373 06P5760 73.4 GB SCSI HDD

Hitachi Ultrastar IC35L073UCDY10-0 0N4332 73.4GB HDD Festplatte SCSI 80-pin 80p

HP SureStore DAT40i C5683-20255 20/40GB C5683 schw.Ai14

IBM CRU 19K0615 36.4GB SCSI 80-pin 10000RPM FS06

HP Surestore C1528F Bandlaufwerk SCSI DAT DDS2 4GB 8GB Tape 6000 C1528-60003

Hitachi Ultrastar IC35L073UCDY10-0 IC35L073UCDY10 07N9428 73.4GB HDD SCSI 80pin

HP DAT Streamer DDS4 C5685C SCSI 68-pin 20GB / 40GB schwarz TR31

IBM 36LZX Ultrastar DDYS-T36950 036FGW 36.7 GB HDD Festplatte SCSI 80p 80-pin

Diverse 73.4GB HDD Festplatte SCSI 80-pin 80 pin 80p 10.000 RPM 8 MB

HP C1536-00100 2 / 4 GB DDS-1 Streamer 13,3cm (5.25 Zoll) Blende SCSI 50p beige

Hitachi Ultrastar IC35L073UCDY10-0 73.4GB SCSI 80p FS69

HP SureStore DAT40i C5683-00255 C5683-20255 20GB/40GB Streamer SCSI 68p schwarz