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SMP-E431-A6西門子

SMP-E431-A6西門子

其命令代碼Commandcode由2～3個ASCII字符組成，共26種，主要有：RCS為讀一個觸點數(shù)據(jù)；WCS為寫一個觸點數(shù)據(jù)；RCP為讀多個觸點數(shù)據(jù)；WCP為寫多個觸點數(shù)據(jù)；RS為讀定時器和計數(shù)器的設(shè)定值；WS為寫定時器和計數(shù)器的設(shè)定值；RCC為將多個觸點數(shù)據(jù)以字方式讀入；WCC為將多個觸點數(shù)據(jù)以字方式寫入；因此，通過對這26種命令組合分析，可以*構(gòu)成由遠程對PLC進行控制，而PLC本身無需編寫任何梯形圖。通過分析測試，例如對 PLC下發(fā)ASCII數(shù)據(jù)串“%01#RCCX00000001**\xod"，共19個字節(jié)，其中X是輸入數(shù)據(jù)類型，Y是輸出數(shù)據(jù)類型，數(shù)據(jù)串末尾是回車符，必須用\xod代替，其中報文可以不計算BCH校驗碼，用**代替，該報文實現(xiàn)了以字方式讀01號PLC中的輸入從0000到0001數(shù)據(jù)，共32 路輸入數(shù)據(jù)。PLC收到該報文后，立即回17個字節(jié)的數(shù)據(jù)串，前6個數(shù)據(jù)為/%01#RC0，后8個數(shù)據(jù)為2個字的輸入點數(shù)據(jù)，每個字數(shù)據(jù)用4個字節(jié)，每個字符可表示4位輸入點的狀態(tài)，設(shè)計了Read_fp1_input（）函數(shù)實現(xiàn)報文分析轉(zhuǎn)換方法。
對PLC的輸出控制用WCC命令實現(xiàn)，其基本數(shù)據(jù)串格式

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為“%01#WCCY000000030000000000000000**/xod"，該報文實現(xiàn)了以字方式置01號PLC中的輸出點從0000到0003數(shù)據(jù)，控制數(shù)據(jù)內(nèi)容為16個字節(jié)，每個字符可表示4位輸出點的狀態(tài)，共64路輸出數(shù)據(jù)。因為每個低壓開關(guān)柜需要“開"、“斷"2 路輸出控制，實際此命令只可控制32路開關(guān)。為了系統(tǒng)可靠，低壓開關(guān)設(shè)計為脈沖控制型，為此必須用通信命令
來實現(xiàn)PLC輸出觸點的同時輸出，延時一段后再對PLC進行求反輸出控制。設(shè)計Write_fp1_output（）函數(shù)實現(xiàn)了具體報文轉(zhuǎn)換成輸出數(shù)據(jù)下發(fā)給PLC的方法。