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直流屏PLC監(jiān)控的選型原則
直流屏PLC監(jiān)控系統(tǒng)以運行穩(wěn)定、性價比高的特點鑄就了在該產(chǎn)品行業(yè)里的楷模，在各大工程項目里有很多優(yōu)先選擇PLC監(jiān)控系統(tǒng)。至于充電模塊，在此類工程項目里用得最多的就是艾默生HD系列的了。
直流屏要用PLC監(jiān)控系統(tǒng)，首先要確定用哪個牌子的PLC。在這里，可以很負(fù)責(zé)的告訴大家，西門子S7-200PLC是各大設(shè)計院和工程項目單位的首選，因為西門子S7-200PLC已經(jīng)成功應(yīng)用于該行業(yè)10年有余，且國內(nèi)有多家直流屏企業(yè)在不斷完善S7-200PLC監(jiān)控系統(tǒng)。至于其他品牌的PLC，比如說三菱FX系列、無錫信捷XC5系列PLC等，也有廠家在制作并完善，但是這幾款PLC在行業(yè)里用的少，維護成本高（當(dāng)監(jiān)控有問題時，只能找原廠家，形成了行業(yè)壟斷）。
直流屏監(jiān)控系統(tǒng)確定選用S7-200系列PLC后，就要確定該監(jiān)控系統(tǒng)所要實現(xiàn)的功能。因為PLC監(jiān)控系統(tǒng)成本要比南方廠家做的單片機系統(tǒng)成本要高，多一個功能可能要多一個PLC模擬量模塊或者是數(shù)字量模塊。所以要精打細(xì)算，用最低的成本實現(xiàn)基本的監(jiān)控需求。
直流屏的幾種選配方案：
1、監(jiān)控系統(tǒng)功能要求：5.7寸觸摸屏顯示，檢測2路交流電源電壓、控母電壓、合母電壓、電池組電壓、正負(fù)對地電壓、負(fù)載電流、電池組充放電電流、18路電池巡檢、支路饋出接地阻值及系統(tǒng)內(nèi)部開關(guān)量、饋出開關(guān)量檢測。
按照上述要求，硬件配置為5.7寸觸摸屏、S7-200-CPU224PLC、PLC擴展模塊EM2311塊、PLC擴展EM221一塊、傳感器N只、PLC及HMI工作電源1塊、電池巡檢模塊1臺、支路絕緣監(jiān)察模塊1臺。
硬件分工解析：PLC224主機可以檢測6路模擬量，分別是電池組電壓、電池組充放電電流、負(fù)載電流和1路交流進線的3相交流電壓。EM231模擬量模塊通過傳感器檢測2路交流進線的3相交流電壓?？啬鸽妷骸⒑夏鸽妷杭澳妇€正負(fù)對地電壓則由支路絕緣監(jiān)察模塊完成檢測。系統(tǒng)內(nèi)部開關(guān)量有PLC224主機剩下的8個輸入點進行檢測，饋出開關(guān)狀態(tài)有PLC擴展模塊EM221完成檢測，電池巡檢和饋出支路接地電阻有相應(yīng)的檢測模塊完成檢測。
2、監(jiān)控系統(tǒng)功能要求：根據(jù)上述功能要求減少第2路進線交流電源的檢測，直接檢測雙電源切換裝置的下口3相交流電壓；
按照上述要求，根據(jù)上述硬件配置減PLC擴展模塊EM231及相應(yīng)的傳感器。
3、監(jiān)控系統(tǒng)功能要求，根據(jù)“1、監(jiān)控系統(tǒng)功能要求”減少了第2路進線交流電源的檢測及電池巡檢功能。
按照上述要求，根據(jù)上述硬件配置減PLC擴展模塊EM231、相應(yīng)的交流電壓傳感器及電池巡檢模塊。
4、監(jiān)控系統(tǒng)功能要求，根據(jù)“1、監(jiān)控系統(tǒng)功能要求”減少了第2路進線交流電源的檢測、電池巡檢功能及支路絕緣監(jiān)察功能。
按照上述要求，因為去掉了絕緣監(jiān)察模塊，所以檢測控母、合母及正負(fù)對地電壓的功能要轉(zhuǎn)移到PLC模塊上。由此，該監(jiān)控系統(tǒng)需要加裝PLC模擬量擴展模塊EM231及相應(yīng)的直流電壓傳感器。由PLC主機檢測電池組電壓、控母正負(fù)對地電壓（由此可計算出控母電壓）、電池組電流、負(fù)載電流，PLC擴展模塊EM231檢測三相交流電壓，電池巡檢功能由電池巡檢模塊完成。
監(jiān)控系統(tǒng)通訊網(wǎng)絡(luò)連接：由5.7寸觸摸屏做主站（PLC做主站的方案成本要高，因為這樣PLC需要占用2個通訊口，需選用224XP或226的PLC，此種方案適用于模塊多的大中型系統(tǒng)），該HMI有兩個通訊接口，COM1做主站接口，COM2做后臺通訊的從站接口。COM1用RS485的方式引出總線，該485總線分別接入PLC主機模塊、電池巡檢模塊、支路絕緣監(jiān)察模塊、數(shù)字式充電模塊。
監(jiān)控系統(tǒng)的通訊協(xié)議：內(nèi)部總線與后臺接口均采用標(biāo)準(zhǔn)MODBUS-RTU協(xié)議，該協(xié)議具有通用性好、協(xié)議功能規(guī)范、傳輸數(shù)據(jù)效率高等特點，受到廣大自動化廠家的青睞。
由此可得出，PLC監(jiān)控系統(tǒng)的配置方案靈活，選型需謹(jǐn)慎。
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