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西門子（SIEMENS）公司的PLC產(chǎn)品包括LOGO、S7-200、S7-1200、S7-300、S7-400等。 西門子S7系列PLC體積小、速度快、標(biāo)準(zhǔn)化，具有網(wǎng)絡(luò)通信能力，功能更強，可靠性高。S7系列PLC產(chǎn)品可分為微型PLC（如S7-200），小規(guī)模性能要求的PLC（如S7-300）和中、高性能要求的PLC（如S7-400）等。西門子股份公司是全球*的技術(shù)企業(yè)，創(chuàng)立于1847年，業(yè)務(wù)遍及全球200多個國家，專注于電氣化、自動化和數(shù)字化領(lǐng)域。作為大的高效能源和資源節(jié)約型技術(shù)供應(yīng)商之一，西門子在海上風(fēng)機建設(shè)、聯(lián)合循環(huán)發(fā)電渦輪機、輸電解決方案、基礎(chǔ)設(shè)施解決方案、工業(yè)自動化、驅(qū)動和軟件解決方案以及醫(yī)療成像設(shè)備和實驗室診斷等領(lǐng)域占據(jù)*地位。

西門子早在中國開展經(jīng)營活動可以追溯到1872年，當(dāng)時西門子公司向中國出口了*臺指針式電報機，并在20世紀(jì)來臨前夕交付了中國*蒸汽發(fā)電機以及*輛有軌電車。1985年，西門子與中國政府簽署了合作備忘錄，成為*家與中國進行深入合作的外國企業(yè)。140多年來，西門子以創(chuàng)新的技術(shù)、的解決方案和產(chǎn)品堅持不懈地為中國的發(fā)展提供全面支持，并以出眾的品質(zhì)和令人信賴的可靠性、*的技術(shù)成就、不懈的創(chuàng)新追求，在業(yè)界獨樹一幟。

西門子見證了中國改革開放帶來的巨大變化，同時也順應(yīng)時代潮流，不斷積極進行自身的改革與發(fā)展。2014財年（2013年10月1日——2014年9月30日），西門子在中國的總營收達(dá)到64.4億歐元，實現(xiàn)穩(wěn)健增長。西門子已在中國建立了77家運營企業(yè)，擁有超過32000名員工，是中國的外商投資企業(yè)之一。

SYMMETRICOM 58532A GPS L1 ANTENNAE ASSEMBLY

TrueTime Symmetricom XL-DC GPS Clock Rubidium IRIG-B N8

Symmetricom GPS 12V Outdoor Antenna 142-614-50 AT575

SYMMETRICOM 090-71000-02 TIMESOURCE2500 ST1 UN D0MTMUA

Symmetricom XLi Time Frequency OCXO Master Clock 1PPS

Symmetricom TrueTime XLi 1510-652

Symmetricom GPS 12V L1 Antenna 142-614-50 AT575 * NEW!

SYMMETRICOM 58529A LINE AMPLIFIER W/L1 BANDPASS FILTER

Symmetricom Alvarion-GPS Timing Receiver eMGW/ MGW

Symmetricom 58532A N type female GPS antenna antenne

Symmetricom Syncserver S250 Network Time Server

RUBIDIUM SYMMETRICOM EFRATOM LPRO-101 10Mhz Oscillator

TimeSource 2700 090-73000-02 CDMA D/W Symmetricom

SYMMETRICOM TIMESOURCE 2700 CDMA PRS NETWORK TIME 

Symmetricom 58532A N type female GPS antenna antenne

SYMMETRICOM 090-61050-01 MICPROCESSOR UNIT SOC1NNE

Symmetricom Timehub 5500 Expansion LOT 093-55505-02 tm

TrueTime Symmetricom NTS-90 GPS Network Clock NTP

SYMMETRICOM 090-61010-01 SECURE7 HS OPT/LNG RCH SNSIVWW

Symmetricom GPS 1:2 Input 2-Way Active Splitter 58535A

SYMMETRICOM 090-61020-01 SECURE7 HS ELECL CH UN SNCDMSP

SYMMETRICOM GPS FREQUENCY STANDARD SPLITTER 58535A

HP/Symmetricom 58534A GPS Timing Antenna 

Symmetricom Timesource 2700 CDMA PRS Complete System

SYMMETRICOM 58529A GPS LINE AMPLIFIER W/L1 BANDPASS NEW

SYMMETRICOM 090-71000-11 TS2500 WIRE WRAP CONNCTR PANEL

Agilent/HP/Symm?etricom 58503B GPS TIME AND FREQ REF REC

SYMMETRICOM 090-61010-01 SECURE7 HS OPT/LNG RCH SNSIVWC

Symmetricom 090-71000-11

Symmetricom GPS Timing Antenna 58534A-H01

Symmetricom Model Z3827A Timing Receiver Unit

Datum Symmetricom GPS Antenna 5V L1 SMA Male 8500-0080

RUBIDIUM SYMMETRICOM EFRATOM LPRO-101 10Mhz Oscillator

Symmetricom 090-45014-02 Sync SAI Assembly f6d3

SYMMETRICOM 090-45098-01 DCD-523 FILLER CARD

SYMMETRICOM 090-41914-02 FUSE ALARM INTERFACE DCD AI CD

SYMMETRICOM 090-61902-01 SECURE7 PWR CONVERTER SNPWBGY

SYMMETRICOM 090-61030-01 SECURE7 DS0 DATAPORT SNCDN0R

SYMMETRICOM TMSL , 090-40010-01 , D0CPBA03AA , 40010-01

Lucent/Symmetri?com OMQ 408645968 Board 5 MHz Oscillator

Symmetricom GoWide 9.2 Go Wide Modem Router 10/100M

Symmetricom DATUM X72 

Symmetricom 58529A GPS Line Amplifier

Symmetricom Telecom Solutions 090-40012-02 Iss A TOTA

Symmetricom 58532A N type female GPS antenna antenne

Datum/Symmetric?om SSU-2000 DS1 20 Outputs 23413017-000

Symmetricom GPS Antenna Bracket 093-00001-01

SYMMETRICOM 090-40015-01 Matrix Control Unit DOCPBF03AA

SYMMETRICOM DATUM TIME CODE CONVERTER IRIG MODEL 9400

Symmetricom / HP 58538A Lightning Arrestor DC-2.5 GHz

SYMMETRICOM 090-40012-02 TOTA Unit DOCPBC15AA 40012-02

SYMMETRICOM 089-40013-01 Motherboard ST 3 DCD 40013-01

SYMMETRICOM 090-40011-01 Toc Unit DCD 400 40011-01

SYMMETRICOM 090-40014-01 Fuse & Alarm Unit DCD 400 FA

Datum Symmetricom PRR-10 GPS DS1 Reference Controller

SYMMETRICOM 090-40010-01 Clock Input Unit DCD 40010-01

Symmetricom Telecom Solutions 090-45015-01 ISS.A MCA-5

Symmetricom 58521A GPS Cable w/ Extras

TrueTime Symmetricom TimeVault GPS Network Master Clock

SYMMETRICOM , 090-45015-01 ISS.A REV-G , D0PQABJ1AA

Symmetricom Telecom Solutions 090-45014-02 ISS B SAI

Symmetricom GPS/VOLUTE ANTENNA BRACKET 093-0000-01 NEW

HP AGILENT 58502A SYMMETRICOM DISTRIBUTION AMPLIFIER

TrueTime Symmetricom NTS-200 GPS Network Master Clock

Symmetricom Telecom Solutions 090-40010-01 CI DCD

Symmetricom Telecom Solutions 090-40011-02 Iss A TOCA

Symmetricom Telecom Solutions 090-40022-07 iss A TOGA

Datum/Symmetric?om bc635VME Time&Frequency Processor,VME

SYMMETRICOM 090-40013-01-IS?S-A

Symmetricom DS1 Output Module 23413017-000-0

Symmetricom TimeExpander Network Timing Expander Manual

SYMMETRICOM Model: Z3827A Remote GPS Receiver/Antenn?a

TrueTime Symmetricom NTS-200 Network Master GPS Clock

Symmetricom TrueTime NTS-200 Network Master GPS Clock

Symmetricom Z3801A GPS Install & User's Guide

TrueTime Symmetricom NTS-200 Network Master GPS Clock

TrueTime Symmetricom NTS-200 GPS Network Master Clock

TrueTime Symmetricom NTS-200 GPS Master Network Clock

HP/AGILENT/SYMM?ETRICOM 55412A ITH CARD FOR A 55400A NSU

HP/AGILENT/SYMM?ETRICOM 55481A CARD 55400A NETWORK UNIT

HP/AGILENT/SYMM?ETRICOM 55485B CARD 55400A NETWORK UNIT

HP/AGILENT/SYMM?ETRICOM 55482A CARD 55400A NETWORK UNIT

DATUM SYMMETRICOM GPS LC E1 FRAMER OCXO

ALVARION SYMMETRICOM 111-03850 AN1280 ANTENNA GPS L1

SYMMETRICOM TIMESOURCE 3100 72020-01 ISS A 

Symmetricom NTBW50AA 090-03845-02 Voltage Timing Module

Nokia Symmetricom EXT GPS Antenna 469357A New 

Symmetricom 58529A GPS Line Amplifier with L1 Bandpass 

Symmetricom 090-58537-01 GPS ACTIVE SMARTSPLITTER 4PORT

Bancomm / Symmetricom PC03V VMEbus Time Code Processor

Bancomm / Symmetricom PC26V VME LED Display PCB

Symmetricom 090-45190-01 DCD-519 SHELF DIGITAL CLOCK