AB1794-OM16

1794-OM16

通过程序逻辑推断故障

现在工业上经常使用的PLC种类繁多，对于低端的PLC而言，梯形图指令大同小异，对于中机，如S7-300，许多程序是用语言表编的。实用的梯形图有中文符号注解，否则阅读很困难，看梯形图前如能大概了解设备工艺或操作过程，看起来比较容易。若进行电气故障分析，一般是应用反查法或称反推法，即根据输入输出对应表，从故障点找到对应PLC的输出继电器，开始反查满足其动作的逻辑关系。经验表明，查到一处问题，故障基本可以排除，因为设备同时发生两起及两起以上的故障点是不多的。

Norstar Nortel Audio Conferencing Unit Polycom

IBM 32R1785 Nortel 10Gb Uplink Ethernet Switch Module f

 Nortel NTN483LL NTN423BH OM3500 Shelf Processor

 w/warranty OME 3500 shelf processor

One-day shipping available

Nortel NT5D51AC REL 02

Nortel Networks NT5G61AA MICPP REL 01 

NORTEL NT9Y98 BACKPANEL NT9Y98AA PROD

Polycom SoundStation2 Direct Connect for Nortel

Nortel Norstar MICS 4X32 with Caller ID and T1/PRI card

Nortel Networks NT5B44AAAEE5 GATM8 8-Port Analogue

CallPilot 150 CP150 64-MB Call Pilot Voicemail Nortel

1  Nortel BCM50 r1 4x8x8 repl 3x8 DR5 Startalk Flash

with updated patches loaded

Enlarge

1  Nortel BCM50 r1 4x8x8 BCM 50 r1.0 1.0 4x8 8vm

with updated patches loaded

Enlarge

Nortel NT0H01BB Optera Metro 5x500

One-day shipping available

Nortel NT0H01CA Optera Metro 5x00

One-day shipping available

Nortel NT0H01CD Optera Metro 5x00

One-day shipping available

NORTEL PASSPORT 8010 SWITCH W/ (2) 8691SF (2) 8608GBIC

Tasman 1200 Tiara 4 Active T1 ports Nortel Router Quad 

One-day shipping available

3  BES 220-24T PWR Nortel Ethernet Switch POE 10/100

1 Year End User Warranty Free Fedex Shipping NT5S02MAE5

One-day shipping available

Nortel AL2012E39 BayStack 420 model 24T 24 port Switch

Nortel Network DS1404079 Passport 8324GT Routing Module

Passport 8324GT Routing Switch Module 24-Port

One-day shipping available

Enlarge

Nortel FMT-6 Fiber Multiplexer Terminal in Original Box

Expedited shipping available

Nortel NT8D25BA

Nortel NT8D3703-06

1 Nortel BCM400 BCM450 Expansion BCM1000e NT7B14AAAC

NORTEL OPTERA LH C-BAND DMXR NTCA15MM WMD2CCC

One-day shipping available

NORTEL OPTERA LH OPTICAL C BAND MUX NTCA15NE WMD2AEC

One-day shipping available

Nortel PCI Secure Encryption Card

Nortel Passport 8010co Chassis DS1402004

1 Nortel BCM200 3.7 8x16 10vm replace CICS 4X16 KSU Ref

NORTEL OPTERA NT0H16QA 5200 OTR BAND 7 CHAN 1 WMTU70T

One-day shipping available

NORTEL PASSPORT 8608GBM SWITCH MODULE DS1404059

Nortel Norstar CICS 4x16 R7.1 CLID, qty:6 M7310 Phones

Enlarge

NORTEL *NTBW70BA* CEM_64

Nortel al1001e01 BAYSTACK 5510-48T 48 PORT

NORTEL 8x24 DR5.1 TELEPHONE SYSTEM W/ 1 M7310 & 7 M7208

Nortel used expandable 4-8 Line telephone phone system

10 Nortel Norstar T7316 Phone NT8B27AABB Platinum Ref

1 Nortel BCM50 r3 4x12x4 BCM 50 3.0 r3.0 4X12 4vm 4as

with updated patches loaded

10 Nortel Norstar Meridian M7324 Phone NT8B40 Black Ref

! Nortel BCM-FEM Fiber Expansion - NT7B07AAAC

One-day shipping available

Nortel Norstar MICS 8X32 with Caller ID - Rls 6.1

No Reasonable Offer Refused

Nortel IP Audio Conference Phone 2033 I2033 Polycom POE

No Reasonable Offer Refused

NORTEL - Call Pilot 100/ Voice Mail Messaging

Nortel NT4T04AA DMS-10 DS30A INTERFACE CARD

Nortel NTRX4002 Circuit Board Refurbished

Nortel Enterprise Edge 1000 Phone System 32DSI/10 Trunk

NT7B58 CICS KSU PHONE SYSTEM with10 M7324 Nortel

Nortel BCM (FEM) Fibre Expansion Media Bay Module

Nortel Norstar CICS 4x16 CI w/7.1 Software Bundle

One-day shipping available

Nortel-Norstar BCM NT5B15AAAH - NT5B1510 MS-BIC Media S

Norstar Nortel Digital Trunk Interface (T-1) NT7B74GA

NORTEL WDM ADM COMPENSATOR NTCC14FA SNT6FKE

One-day shipping available

Nortel Baystack 5510 AL1001A02 BS 5510-24T Switch

Expedited shipping available

! Nortel BCM50 Main Unit Rls 3.0 - NT9T6502E5

One-day shipping available

Nortel Norstar MICS 8X32 with Caller ID - Rls 7.0

Nortel Norstar MICS 0X32 with Caller ID - Rls 6.1

WORKING NORTEL NORSTAR COMPACT ICS, FLASH VM & 4 PHONES

Nortel Norstar 6x16 KSU,Voicemail,M8,Phone Card

12 Nortel Norstar Meridian M7208 Phone NT8B30 Black Ref

Nortel Passport 8348TX-PWR 48 Port 10/100 POE DS1404078

Nortel BCM 4x16 Combination Media Bay Module

Nortel BCM 8-Port Analog Station Media Bay Module

Nortel BCM 50 Unified Messaging - 16 Seat Code NTKC0211

Nortel NTN437AA DS3x3 Interface

One-day shipping available

Nortel BCM 400 Unified Messaging 16 Seat Code NTKC0007

Nortel OPTera 5200 chassis NT0H50AA 02

NORTEL 8632TXE PASSPORT DS1404024 CARD NETWORKS GIGABYT

1  Nortel BCM50 r1 2x4x2 BCM 50 1.0 & 4 M7310 NT8B20

with updated patches loaded

Enlarge

Nortel BCM 32-Circuit Digital Station Media Bay Module

Polycom Soundstation2 Direct Connect For Nortel

FREE shipping Generous 30-day return policy

Expedited shipping available

Nortel OPTera NTEU15AA STM-4o Trib

Polycom 2200-17120-001 Soundstation2 for Nortel Mer PBX