描述
限制文件傳輸協(xié)議(FTP)。FTP用于在設(shè)備之間傳輸、交換文件,在SCADA、dcs、PLC、RTU等系統(tǒng)中都有應(yīng)用。FTP協(xié)議并沒(méi)有任何安全原則,登入密碼不加密,有些FTP為了實(shí)現(xiàn)歷史緩沖區(qū)而出現(xiàn)溢出的漏洞,所以應(yīng)配置防火墻規(guī)則阻塞其通信。如果FTP通訊不能被要求禁止,通過(guò)FTP輸出數(shù)據(jù)時(shí),應(yīng)額外增加多個(gè)特征碼授權(quán)認(rèn)證,并提供加密的通信隧道。
簡(jiǎn)單郵件傳輸協(xié)議(SMTP)。SMTP在互聯(lián)網(wǎng)上是主要的電子郵件傳輸協(xié)議。電子郵件經(jīng)常包含惡意代碼程序,所以不應(yīng)允許以任何控制網(wǎng)絡(luò)設(shè)備接收電子郵件,SMTP郵件應(yīng)主要用于從控制網(wǎng)絡(luò)到辦公網(wǎng)絡(luò)之間輸出發(fā)送報(bào)警信息。簡(jiǎn)單網(wǎng)絡(luò)管理協(xié)議(SNMP)。SNMP是網(wǎng)絡(luò)管理服務(wù)中心,提供管理控制臺(tái)與設(shè)備如網(wǎng)絡(luò)設(shè)備、打印機(jī)、PLC之間的監(jiān)控,并制定管理的會(huì)話規(guī)則。從運(yùn)維角度看,SNMP是非常有用的服務(wù),但在安全方面存在很多問(wèn)題。SNMPV1和SNMPV2C的安全機(jī)制比較脆弱,通信不加密,所有通信字符串和數(shù)據(jù)都以明文形式發(fā)送。攻擊者一旦捕獲了網(wǎng)絡(luò)通信,就可以利用各種嗅探軟件直接獲取通信字符串,即使用戶改變了通信字符串的默認(rèn)值也無(wú)濟(jì)于事。SNMPV3解決了上述安全性問(wèn)題,但卻沒(méi)有被廣泛使用。從控制網(wǎng)中使用SNMPV1和V2C的命令都應(yīng)被禁止,除非它是一個(gè)完全獨(dú)立的信任管理網(wǎng)絡(luò)。而即使設(shè)備已經(jīng)支持SNMPV3,許多廠商使用的還是標(biāo)準(zhǔn)的通信字符串,存在重大安全隱患。因此,雖然SNMPV3比以前的版本提供了更多的安全特性,如果配置不當(dāng),其實(shí)際效果仍舊有限,這一點(diǎn)也需要引起足夠的重視。
產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢(shì)價(jià)格,大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門子,摩托羅拉,安川。力士樂(lè)。ACSO,橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家
TAYLOR ABB MOD 300 CONTROLLER BOARD 6051NA10424
TAYLOR ABB MOD 300 I/O EXT. 6216BZ10000
TAYLOR ABB MOD 300 DCN INT. 6253BZ10000
TAYLOR ABB MOD 300 CNTLR FAN ASSY P/N: 6215FZ10100
TAYLOR ABB MOD 300 BCKUP MEM MODULE 6014BZ10100
TAYLOR ABB MOD 300 I/O EXT. MODULE 6016BZ10000
TAYLOR ABB MOD 300 DIGITAL CONTROLLER BD 6050NA10424
PCA984145 PC-A984-145 MODICON CPU MODULE
TAYLOR ABB MOD 300 SIM MODULE 6010BZ10000
Simplex Fire Alarm Model 4120 POWER SUPPLY 562-974
XF523A HONEYWELL INPUT MODULE XF523A
AS-BADU-206 MODICON INPUT MODULE ASBADU206
550-405 SIEMENS LANDIS /GYR ATEC VAV 550405
550-405 SIEMENS LANDIS /GYR ATEC VAV **NEW** 550405
140-CPU-113-03 MODICON CPU MODULE NIB 140CPU11303
545-791 SIEMENS NETWORK ENCLOSURE BRAND NEW 545791
Simplex Fire Alarm Model 4120 MTHRDBD CLASS B 562-856
AM-S980-830 MODICON NETWORK CONTROLLER AMS980830
SIEMENS/LANDIS & GYR – 538-665 538665 TRUNK INTERFACE
Simplex Fire Alarm Model 4120 LED/SWITCH CONT. 562-729
TSXWMY100 MODICON TSX PREMIUM FCHMI MODULE
TAYLOR ABB MOD 300 PROCESSOR 6024BZ10300
TAYLOR ABB MOD 300 TRANSFER MODULE 6215BZ10000
6EP13311SL11 SIEMENS POWER SUPPLY 6EP1 331-1SL11
AS-BDEO-216 MODICON INPUT MODULE ASBDEO216
AS-BDAP-220 MODICON NEW FACTORY SEALED ASBDAP220
TAYLOR ABB MOD 300 FIELD BUS MODULE 6227BZ10200
TAYLOR ABB MOD 300 CPU 6024BZ10101
ALLEN BRADLEY 1771-A1B B 1771A1BB 4 Slot I/O CHASIS
Simplex Fire Alarm Model 4120 SIGNAL ZAM 562-617
140-CRP-931-00 MODICON QUANTUM PROCESSOR 140CRP93100
NW-RR85-001 MODICON REPEATER NWRR85001
AS-BDAP-253 MODICON MODULE RELAY ASBDAP253
AS-BDEP-257 MODICON I/O MODULE ASBDEP257
14506471 HONEYWELL EXCEL PLUS POWER SUPPLY 1450 6471
14506052-001 HONEYWELL EXCEL PLUS TERM. BD. 1450605201
ACI/CO-2075-D CO SENSOR POLYGARD CO AT-1110 NEW
AUTOMATION COMPONENTS ACI/1K-2W-I-4″-?EH NEW
AUTOMATION COMPONENTS SENSOR ACI/100KS-O NEW
AUTOMATION COMPONENTS SENSOR ACI/375-I-2.5″ NEW
AUTOMATION COMPONENTS RH SENSOR ACI/RH3-TTM1K-D
AUTOMATION COMPONENTS SENSOR ACI/1K-2W-RS
ACI/CO-2075-R CO SENSOR POLYGARD CO AT-1110 NEW
AUTOMATION COMPONENTS ACI/1K-3W-S NEW
ACI/PG-RH2-TTM1?K-RP-20 AUTOMATION COMPONENTS RH SENSOR
490NRP25400 MODICON FIBER OPTIC REPEATER 490-NRP-25-400
Allen Bradley 1747-L511 Series B Processor 1747L511
MODICON AS-J892-101 NEW SURPLUS ASJ892101
MODICON TSX QUANTUM 140 DRC 830 00 140DRC83000
MODICON TSX QUANTUM 140 CPS 124 00 140CPS12400
AS-E908-131 MODICON MEMORY MODULE ASE908131
140-DDO-353-01 MODICON TSX QUANTUM 140DDO35301
ABB MOD 300 BULK POWER SUPPLY 6024NR14130
MODICON TSX QUANTUM 140DDO15310 5 VDC 140 DDO 153 10
AS-BADU-205 MODICON INPUT MODULE ASBADU205
MODICON TSX QUANTUM IFC020 RESOLVER INPUT
PC-E984-275 MODICON CPU MODULE PCE984275
TAYLOR ABB MOD 300 D/M MODULE 6009BZ10000
TAYLOR ABB MOD 300 VIDEO MODULE 6008BZ10000
TAYLOR ABB MOD 300 PROCESSOR MODULE 6024BP10300
MODICON AS-B872-002 ASB872002 ANALOG OUTPUT MODULE
TAYLOR ABB MOD 300 SERIAL I/O MODULE 6007BG10000
SIEMENS/LANDIS & GYR – 544-381 544381 UC BACKPLANE BRD
TAYLOR ABB MOD 300 F-BUS INTERFACE 6203BZ10000
ABB MOD 300 FIELD BUS MODULE 2-CHANNEL P/N 6204BZ10200
ABB MOD 300 I/O XFER MODULE P/N 6215BZ10000
1746-NO4V ALLEN BRADLEY OUTPUT MODULE 1746NO4V
140-ACI-030-00 MODICON TSX QUANTUM 140ACI03000
MODICON AS-B875-111 REM ASB875111 ANALOG INPUT MODULE
545-703 SIEMENS/LANDIS & GYR POWER MODULE 545703
TSXETZ410 MODICON COMMUNICATION MODULE
SIEMENS PTM62I420 LANDIS & GYR – PTM6.2I420
538-955 SIEMENS TRUNK ISOLATOR/EXTEND?ER 538955
TAYLOR ABB MOD 300 D/F MODULE 6005BZ10000
XI581AH HONEYWELL XL500 OPERATOR TERMINAL
545-487 SIEMENS SCU V5 CONTROLLER 545487
Allen Bradley 1203-SM1 Ser. A Scanport Module 1203SM1
XF529 HONEYWELL XL500 MODULE OUTPUT
CM900 DATALOGIC AUTOID MODULE
AS-BDEP-214 MODICON INPUT MODULE ASBDEP214
HONEYWELL XL500 Blank Housing Cover
AS-B873-001 MODICON ANALOG INPUT MODULE ASB873001
SIEMENS PTM62N100K LANDIS & GYR – PTM6.2N100K NIB
SIEMENS PTM62Q250 LANDIS & GYR – PTM6.2Q250
SIEMENS PTM62Q250M LANDIS & GYR – PTM6.2Q250-M
SIEMENS PTM62Y420 LANDIS & GYR – PTM6.2Y420
SIEMENS PTM64D20 LANDIS & GYR – PTM6.4D20
TAYLOR ABB MOD 300 CPU 6204BZ10100
MODICON AS-BDEP-210 ASBDEP210
AS-B882-032 MODICON OUTPUT MODULE ASB882032
140-AVI-030-00 MODICON INPUT MODULE 140AVI03000
140-ATI-030-00 MODICON INPUT MODULE 140ATI03000
ALLEN BRADLEY 1771-P4S B 1771P4SB POWER SUPPLY
SIEMENS 545 701LANDIS & GYR 545-701 PRE APOGEE 545701
SIEMENS 545701 LANDIS & GYR 545-701 PRE APOGEE 545 701
MODICON PC-E984-385 PCE984385 PROGRAMMABLE CONTROLLER
Simplex Fire Alarm Model 4120 AUDIO BD ASSY 562-894
Simplex Fire Alarm Model 4120 MTHBD 565-274
MODICON TSX QUANTUM 140 ACO 020 00 140ACO02000
MODICON AS-BDEP-216 ASBDEP216 AEG 16 POINT INPUT 24VDC
LANDIS & GYR – 536-765 V4 O.S. 12.2
SIEMENS/LANDIS & GYR – 533-500 MFC LINE CARD
140-DAO-842-10 MODICON OUTPUT MODULE NOB 140DAO84210
LANDIS & GYR – 533-660 SCU ANALOG OUTPUT
SIEMENS/LANDIS & GYR – 533-665 533665 SCU
SIEMENS/LANDIS & GYR – 534-295 534295
SIEMENS/LANDIS & GYR – 535-111 535111
SIEMENS/LANDIS & GYR – 545-715 O.S. 1.41
SIEMENS APOGEE – 545-715 O.S. 2.3
SIEMENS/LANDIS & GYR – 545-719 O.S. 1.3
SIEMENS APOGEE – 545-719 O.S. 2.3
SIEMENS/LANDIS & GYR – 545-719 O.S. 2.4
PE0001000 POWER SUPPLY MODULE 24VDC OUTPUT PE-0001-000
SIEMENS/LANDIS & GYR – 529-015 529015
SIEMENS/LANDIS & GYR – 529-610 529610 POWER SUPPLY
SIEMENS/LANDIS & GYR – 529-620 529620 OUTPUT PICKET
SIEMENS/LANDIS & GYR – 529-625 529625 INPUT PICKET
AS-BDAU-202 MODICON ANALOG OUTPUT MODULE ASBDAU202
SIEMENS/LANDIS & GYR – 529-720 529720 OUTPUT CARD
1747-L542 ALLEN BRADLEY CPU MODULE 1747L542
SIEMENS/LANDIS & GYR – 531-650 531650 OUTPUT CARD
SIEMENS LANDIS & GYR – 533-255 533255 OUTPUT CARD
140-DDI-841-00 MODICON TSX QUANTUM 140DDI84100
SIEMENS/LANDIS & GYR – 544-110 544110 PROCESSOR CARD
XF524A HONEYWELL INPUT MODULE XF524A
PLC模塊,可編程控制器,CPU模塊,IO模塊,AI模塊,通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家