H92主機(jī)模塊,FOXBORO中文使用說(shuō)明
控制層網(wǎng)絡(luò)采用實(shí)時(shí)、高效的Controlnet網(wǎng)絡(luò)。Controlnet網(wǎng)絡(luò)是一種高性能的工業(yè)局域網(wǎng)，具有開(kāi)放性、高效率、多功能、確定性、可重復(fù)性和靈活性等特點(diǎn)，擴(kuò)展性極強(qiáng)，可共享I/O，并具有強(qiáng)大、方便的網(wǎng)絡(luò)組態(tài)，診斷功能及可靠性，網(wǎng)絡(luò)通訊不會(huì)隨著將來(lái)系統(tǒng)擴(kuò)容時(shí)節(jié)點(diǎn)增加導(dǎo)致網(wǎng)絡(luò)性能下降，通訊速率始終保持在5Mbps。
H92主機(jī)模塊,FOXBORO中文使用說(shuō)明結(jié)合現(xiàn)場(chǎng)工藝，優(yōu)化了控制程序。在稱量過(guò)程中采用變頻方法調(diào)節(jié)給料速度，剛開(kāi)始快速給料，等稱量值接近設(shè)定值時(shí)變成慢速給料，以防稱重過(guò)量，在更加接近設(shè)定值時(shí)變成點(diǎn)動(dòng)給料，一點(diǎn)一點(diǎn)地微量自動(dòng)給料，直至到設(shè)定值范圍內(nèi)為止?？旆Q值、慢稱值及點(diǎn)動(dòng)值可通過(guò)上位機(jī)修改，客戶可根據(jù)現(xiàn)場(chǎng)實(shí)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(wèn)題。如果一個(gè)單片機(jī)系統(tǒng)符合下面三個(gè)條件，則該系統(tǒng)是電磁兼容的：
① 對(duì)其它系統(tǒng)不產(chǎn)生干擾；
② 對(duì)其它系統(tǒng)的發(fā)射不敏感；
③ 對(duì)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(guò)導(dǎo)體、公共阻抗耦合等)，就是間接的(通過(guò)串?dāng)_或輻射耦合)。電磁干擾的產(chǎn)生是通過(guò)導(dǎo)體和通過(guò)輻射，很多電磁發(fā)射源，如光照、繼電器、DC電機(jī)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(hào)。在高速單片機(jī)系統(tǒng)中，時(shí)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(dá)300 MHz的諧波失真，在系統(tǒng)中應(yīng)該把它們?nèi)サ?。另外，在單片機(jī)系統(tǒng)中，最容易受影響的是復(fù)位線、中斷線和控制線。干擾的耦合方式
1、 傳導(dǎo)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(guò)導(dǎo)體。一條穿過(guò)噪聲環(huán)境的導(dǎo)線可撿拾噪聲并把噪聲送到其它電路引起干擾。設(shè)計(jì)人員必須避免導(dǎo)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(guò)電源線進(jìn)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(jìn)入電路之前必須對(duì)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
