MINI-SYS-PS-100-240AC/24DC/1.5

描述

PLC控制系统的地线包括系统地、屏蔽地、交流地和保护地等。接地系统混乱对PLC系统的干扰主要是各个接地点电位分布不均，不同接地点间存在地电位差，引起地环路电流，影响系统正常工作。例如电缆屏蔽层必须一点接地，如果电缆屏蔽层两端A、B都接地，就存在地电位差，有电流流过屏蔽层，当发生异常状态如雷击时，地线电流将更大。

此外，屏蔽层、接地线和大地有可能构成闭合环路，在变化磁场的作用下，屏蔽层内有会出现感应电流，通过屏蔽层与芯线之间的耦合，干扰信号回路。若系统地与其它接地处理混乱，所产生的地环流就可能在地线上产生不等电位分布，影响PLC内逻辑电路和模拟电路的正常工作。PLC工作的逻辑电压干扰容限较低，逻辑地电位的分布干扰容易影响PLC的逻辑运算和数据存贮，造成数据混乱、程序跑飞或死机。模拟地电位的分布将导致测量精度下降，引起对信号测控的严重失真和误动作。

2.3来自PLC系统内部的干扰

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Extreme Networks Black Diamond 6808 MSM64i G8Ti Switch
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IXIA LM-100TX 4 port 10/100Base-TX Ethernet Module 1600
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Cisco IGX-UFM-4C Universal Frame Relay Card 4 Port
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Extreme 51034 Multiplexing (WDM) Module BD 6808
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Cisco IGX-UFM-C Universal Frame Relay Module C IGX8400
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Cisco MGX AX-FRSM-4E1-C Frame Service Module CHAN E1
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Alcatel Expert Telecoms A8619 PTS Signalling System
SS7, V5, ISDN, INAP, GSM, GPRS, CDMA and IP based

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Ameritec AM2-A Niagara Self-Contained Analog Call Gen
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New Juniper Branded XFP-10G-S 10GE transceiver 850nm
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Extreme Networks MSM-G8X 41211 Aspen 8800 MGMT Module
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Canoga Perkins EdgeAccess UCS 1000 WWDM Multiplexer

Ameritec AM2E-A Niagra Analog Bulk Call Generator
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Alcatel OS7-GNI-U12 OmniSwitch 12 port SFP 1000Base mod
List Price $7495.00ea! Free Shipping! 30 Day Warranty!

Adtech AX/4000 OC-3c 155.52 Analyzer Set 400301 401311
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Cisco AS5800 DC Access Server/Voice Gateway 24T1 144DMM

Cisco MGX AX-BNM-E3/B BNM 1-E3 port, model B
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Cisco IGX-UXME-4-MMF – IGX-UXME + BC-UFI-4-155-MM​F
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Cisco C85FE-16F-16K Fast Ethernet FX Module 8500 Router

Cisco CTE 1400 Content Transformation Engine New in Box
45 Day Warranty – Bid With Confidence!

Juniper M320-FPC1 Type 1 FPC for Juniper M320 Router
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Mayan Networks Unifier SMX SONET ADM Multiplexer
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Juniper SRP-5G+ 5-Gbps switch fab Mod ERX-5ECC-SRP ERX
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Juniper SA4000 Secure Access SSL VPN Appliance
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Juniper SFM-CF-E-16 SFM-16-S For M40e M160 Router

Juniper P-AS Adaptive Services PIC for M20 M40 Router
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Juniper PB-4E3-ATM 4-Port ATM E3 PIC for M160 Router
180 Day Warranty – Free Shipping!!

Lucent APX8-SP-SC Controller Card w 320 Mb Flash APX8-S
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NEW Agilent Z4425A LAN WAN Analyzer TS-4511/P set
Make me an offer need to move this out!

Juniper PE-12FE-TX-MDI w Cab M5 M7i M10 M10i Router PIC
90 Day Warranty Free Overnight Shipping

Lucent Springtide 5000 Switch Router
Make me an offer, I am willing to work with you!

Nortel NT0H11EK OPTera 5100/5200 OCI 4:1 Sub Rate MUX
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Nortel NT0H01SB OPTera Metro 5200 OCLD 1.25Gbps B5 CH2
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Nortel NT0H01SC OPTera Metro 5200 OCLD 1.25Gbps B5 CH3
90 Day Hardware Warranty – Free Overnight Shipping!