不同的PLC使用不同的編程軟件。但是對于任何一種軟件來說，編程前的第一步就是進(jìn)行硬件組態(tài)，根據(jù)實(shí)際PLC的類型建立硬件配置及相應(yīng)的通訊配置。硬件組態(tài)完成后，將之前在紙上記錄下來的I/O地址寫在軟件的符號表中。由于軟件不同，對于符號表的定義可能不同，但一般的軟件都有該功能，這一步是至關(guān)重要的。在編寫符號表時，不僅要把設(shè)備輸入輸出的絕對地址寫正確，最好再給每個地址命名并添加注釋，這對后面的編程會非常方便。不需要在編程時每次都查詢絕對地址，只要填寫命名好的名稱即可。當(dāng)然，這也取決于軟件是否具備此功能。?正序、負(fù)序、零序的出現(xiàn)是為了分析在系統(tǒng)電壓、電流出現(xiàn)不對稱現(xiàn)象時，把三相的不對稱分量分解成對稱分量及同向的零序分量。只要是三相系統(tǒng)，就能分解出上述三個分量。對于理想的電力系統(tǒng)，由于三相對稱，因此負(fù)序和零序分量的數(shù)值都為零。當(dāng)系統(tǒng)出現(xiàn)故障時，三相變得不對稱了，這時就能分解出有幅值的負(fù)序和零序分量度了，因此通過檢測這兩個不應(yīng)正常出現(xiàn)的分量，就可以知道系統(tǒng)出了毛病。下面再介紹用作圖法簡單得出各分量幅值與相角的方法，先決條件是已知三相的電壓或電流，當(dāng)然實(shí)際工程上是直接測各分量的。
零序電流保護(hù)：利用接地時產(chǎn)生的零序電流使保護(hù)動作的裝置，叫零序電流保護(hù)。在電纜線路上都采用專門的零序電流互感器來實(shí)現(xiàn)接地保護(hù)。零序電流保護(hù)：中性點(diǎn)直接接地系統(tǒng)發(fā)生接地短路，將產(chǎn)生很大的零序電流，利用零序電流分量構(gòu)成保護(hù)，可以作為一種主要的接地短路保護(hù)。零序過流保護(hù)不反應(yīng)三相和兩相短路，在正常運(yùn)行和系統(tǒng)發(fā)生振蕩時也沒有零序分量產(chǎn)生，所以它有較好的靈敏度。、
但零序過流保護(hù)受電力系統(tǒng)運(yùn)行方式變換影響較大，靈敏度因此降低，特別是短距離線路上以及復(fù)雜的環(huán)網(wǎng)中，由于速動段的保護(hù)范圍太小，甚至沒有保護(hù)范圍，致使零序電流保護(hù)各段的性能嚴(yán)重惡化，使保護(hù)動作時間很長，靈敏度很低。

Quantum Sun 213830-17P 212330-05 6471405-11 633056405

Sun 380-1196-1 LTO-3 Tape Drive 6420800-11 70-85775-01

Motorola VME Card SBC MPC750 EO-00102 XPC8260 8260 166

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DEC Rainbow 100/190 ONLY ONE IN THE WORLD rare vintage

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Motorola MCPN765 CPCI CompactPCI SBC 01-W3722F-23A 750

BULK LOT 11 Sun Ultra 10 375-0115,0079,0?066 Motherboard

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Motorola CPCI CompactPCI JTAG CPLD Tsi320 01-W3850F-01A

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27256 256 256K EPROM Large Quantity BULK LOT 1000 pcs

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Qbus DEC VAX M7624-AL CPU KA640 Mayfair II

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Iomega Bernoulli 230 Internal SCSI Drive Beta 230A

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Quantum ProDrive 1800S SCSI Hard Drive 50-pin

Tape Drive SCSI Archive 2150eS 2150S 2150 81259-776

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Motherboard Pentium ZIDA 5DXP v1.0 430FX

Pentium Motherboard Socket5 Gigabyte GA-586AP v.1b P75

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Number Nine ISA Video Card #9GXE JF9-GXE SVGA S3 928

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IBM 8-inch Floppy Disk Drive 3274 4240517 4240620

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360K 400K Floppy Drive Sony OA-D31V-14 HH 3.5 in

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Amstrad PCW EME-232 CF-2 Floppy Drive PCW9512 Z80265

Motherboard Dual Slot1 P3 Intel E186194 750780-606 133

SeaLevel ACB-530 4111 Rev.C ISA RS-530 RS-422/485 449

PIKA PIK8855 Daytona/16P8L ISA Card PIK-028-00234

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SDL WANic-500 PCI Card 6-0064 with RS-422 6-0072 Rev2

專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊