C98043-A1601-L產(chǎn)品說(shuō)明：
C98043-A1601-L
由于典型的PLC使用環(huán)境比較惡劣，因此傳輸必須高度穩(wěn)健。在多種能傳送位的物理層調(diào)制方案中，有兩種特別適合工業(yè)監(jiān)視和控制的方案，即頻移鍵控(FSK)和二元相移鍵控(BPSK)。由于該兩種方案都不依賴電力信號(hào)作為載波，因此可以用在任何頻率、任何電壓值的AC和DC電力線上。而當(dāng)節(jié)點(diǎn)的供電中斷時(shí)，只要控制通信電路的獨(dú)立供電不間斷，F(xiàn)SK和BPSK還能照常工作。
FSK采用兩個(gè)不同的頻率發(fā)送信號(hào)，電平“1”時(shí)用74kHz，電平“0”時(shí)用63.3kHz；而B(niǎo)PSK則采用相同頻率發(fā)送“1”和“0”，其相位差為180度。監(jiān)控通信常用標(biāo)準(zhǔn)是CEA179，其指定BPSK發(fā)送頻率為131.5kHz，波特率是5.5kbps或每個(gè)碼元24個(gè)周期。雖然CEA-179沒(méi)有對(duì)FSK加以規(guī)范，但它完全兼容該標(biāo)準(zhǔn)的協(xié)議棧，因此也可以使用CEA-179進(jìn)行傳輸。在滿足系統(tǒng)限制的前提下，數(shù)字信號(hào)控制器可以通過(guò)改變傳輸頻率來(lái)避開(kāi)干擾，從而提高通信性能。
圖1是專為可靠性進(jìn)行設(shè)計(jì)的CEA-179數(shù)據(jù)包格式。該數(shù)據(jù)包和位的邊界是用于位同步的24位向量，后面是指示數(shù)據(jù)起始位的11位字同步信號(hào)。發(fā)送器將每8位指令編碼成一個(gè)11位的字，在接收器側(cè)再將其解碼并移位至存儲(chǔ)器緩存。在PLC中，指令數(shù)據(jù)還增加了16位的循環(huán)冗余校驗(yàn)碼(CRC)，EOP則使用重復(fù)的11位字進(jìn)行識(shí)別。因此，CEA-179協(xié)議與BPSK和FSK的結(jié)合可確保穩(wěn)健的PLC傳輸，并能為多節(jié)點(diǎn)的實(shí)時(shí)控制提供足夠的帶寬。
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