H92主機模塊,FOXBORO中文使用說明
控制層網(wǎng)絡采用實時、高效的Controlnet網(wǎng)絡。Controlnet網(wǎng)絡是一種高性能的工業(yè)局域網(wǎng)，具有開放性、高效率、多功能、確定性、可重復性和靈活性等特點，擴展性極強，可共享I/O，并具有強大、方便的網(wǎng)絡組態(tài)，診斷功能及可靠性，網(wǎng)絡通訊不會隨著將來系統(tǒng)擴容時節(jié)點增加導致網(wǎng)絡性能下降，通訊速率始終保持在5Mbps。
H92主機模塊,FOXBORO中文使用說明結(jié)合現(xiàn)場工藝，優(yōu)化了控制程序。在稱量過程中采用變頻方法調(diào)節(jié)給料速度，剛開始快速給料，等稱量值接近設定值時變成慢速給料，以防稱重過量，在更加接近設定值時變成點動給料，一點一點地微量自動給料，直至到設定值范圍內(nèi)為止。快稱值、慢稱值及點動值可通過上位機修改，客戶可根據(jù)現(xiàn)場實際情況修改參數(shù)，即保證了稱量速度，又能保證稱量精度。磁兼容性(EMC)包含系統(tǒng)的發(fā)射和敏感度兩方面的問題。如果一個單片機系統(tǒng)符合下面三個條件，則該系統(tǒng)是電磁兼容的：
① 對其它系統(tǒng)不產(chǎn)生干擾；
② 對其它系統(tǒng)的發(fā)射不敏感；
③ 對系統(tǒng)本身不產(chǎn)生干擾。
假若干擾不能完全消除，但也要使干擾減少到最小。干擾的產(chǎn)生不是直接的(通過導體、公共阻抗耦合等)，就是間接的(通過串擾或輻射耦合)。電磁干擾的產(chǎn)生是通過導體和通過輻射，很多電磁發(fā)射源，如光照、繼電器、DC電機和日光燈都可引起干擾;AC電源線、互連電纜、金屬電纜和子系統(tǒng)的內(nèi)部電路也都可能產(chǎn)生輻射或接收到不希望的信號。在高速單片機系統(tǒng)中，時鐘電路通常是寬帶噪聲的最大產(chǎn)生源，這些電路可產(chǎn)生高達300 MHz的諧波失真，在系統(tǒng)中應該把它們?nèi)サ簟Ａ硗猓趩纹瑱C系統(tǒng)中，最容易受影響的是復位線、中斷線和控制線。干擾的耦合方式
1、 傳導性EMI
一種最明顯而往往被忽略的能引起電路中噪聲的路徑是經(jīng)過導體。一條穿過噪聲環(huán)境的導線可撿拾噪聲并把噪聲送到其它電路引起干擾。設計人員必須避免導線撿拾噪聲和在噪聲引起干擾前，用去耦辦法除去噪聲。最普通的例子是噪聲通過電源線進入電路。若電源本身或連接到電源的其它電路是干擾源，則在電源線進入電路之前必須對其去耦。
The picture is not clear enough
The maximum definition of pictures taken by standard definition camera is 704 & times; 576. There is little video information that can be accommodated. Due to the lack of picture definition, the recognition effect is affected, which has an impact on the analysis and evidence collection of electronic police.
2) The stability of the equipment is not high
Most of the on-site processing equipment in the standard definition bayonet system are industrial control computers, while most of the transmission equipment are ordinary switches and optical fiber transceivers. The operation is not stable in the external harsh environment. The faults caused by dust accumulation, humidity, temperature, lightning and other factors may occur at any time. Therefore, a lot of maintenance work is brought and the later cost is high. Even so, it is difficult to ensure that the system can work continuously.
3) Weak EMC performance of the system
Electromagnetic compatibility EMC refers to the ability of equipment or system to meet the requirements in its electromagnetic environment and not produce intolerable
