490NRP25400 輸入信號(hào)的采樣和對(duì)輸出狀態(tài)的刷新
490NRP25400 輸入信號(hào)的采樣和對(duì)輸出狀態(tài)的刷新 - 圖片 2
490NRP25400 輸入信號(hào)的采樣和對(duì)輸出狀態(tài)的刷新 - 圖片 3
490NRP25400 輸入信號(hào)的采樣和對(duì)輸出狀態(tài)的刷新 - 圖片 4
490NRP25400 輸入信號(hào)的采樣和對(duì)輸出狀態(tài)的刷新 - 圖片 5

490NRP25400 輸入信號(hào)的采樣和對(duì)輸出狀態(tài)的刷新

PLC是采用“順序掃描，不斷循環(huán)”的方式進(jìn)行工作的。即在PLC運(yùn)行時(shí)，CPU根據(jù)用戶(hù)按控制要求編制好并存于用戶(hù)存儲(chǔ)器中的程序，按指令步序號(hào)（或地址號(hào)）作周期性循環(huán)掃描，如無(wú)跳轉(zhuǎn)指令，則從條指令開(kāi)始逐條順序執(zhí)行用戶(hù)程序，直至程序結(jié)束。然后重新返回一條指令，開(kāi)始下一輪新的掃描。在每次掃描過(guò)程中，還要完成對(duì)輸入信號(hào)的采樣和對(duì)輸出狀態(tài)的刷新等工作。
分類(lèi)：

描述

490NRP25400 輸入信號(hào)的采樣和對(duì)輸出狀態(tài)的刷新

PLC是采用“順序掃描，不斷循環(huán)”的方式進(jìn)行工作的。即在PLC運(yùn)行時(shí)，CPU根據(jù)用戶(hù)按控制要求編制好并存于用戶(hù)存儲(chǔ)器中的程序，按指令步序號(hào)（或地址號(hào)）作周期性循環(huán)掃描，如無(wú)跳轉(zhuǎn)指令，則從條指令開(kāi)始逐條順序執(zhí)行用戶(hù)程序，直至程序結(jié)束。然后重新返回一條指令，開(kāi)始下一輪新的掃描。在每次掃描過(guò)程中，還要完成對(duì)輸入信號(hào)的采樣和對(duì)輸出狀態(tài)的刷新等工作。

PLC的一個(gè)掃描周期必經(jīng)輸入采樣、程序執(zhí)行和輸出刷新三個(gè)階段。

PLC在輸入采樣階段：首先以掃描方式按順序?qū)⑺袝捍嬖谳斎腈i存器中的輸入端子的通斷狀態(tài)或輸入數(shù)據(jù)讀入，并將其寫(xiě)入各對(duì)應(yīng)的輸入狀態(tài)寄存器中，即刷新輸入。隨即關(guān)閉輸入端口，進(jìn)入程序執(zhí)行階段。

PLC在程序執(zhí)行階段：按用戶(hù)程序指令存放的先后順序掃描執(zhí)行每條指令，經(jīng)相應(yīng)的運(yùn)算和處理后，其結(jié)果再寫(xiě)入輸出狀態(tài)寄存器中，輸出狀態(tài)寄存器中所有的內(nèi)容隨著程序的執(zhí)行而改變。

輸出刷新階段：當(dāng)所有指令執(zhí)行完畢，輸出狀態(tài)寄存器的通斷狀態(tài)在輸出刷新階段送至輸出鎖存器中，并通過(guò)一定的方式（繼電器、晶體管或晶閘管）輸出，驅(qū)動(dòng)相應(yīng)輸出設(shè)備工作。

490NRP25400 輸入信號(hào)的采樣和對(duì)輸出狀態(tài)的刷新

PLC is the use of “sequential scanning, continuous cycle” way to work. That is, when the PLC is running, the CPU is prepared according to the user’s control requirements and exists in the user’s memory program, according to the instruction step number (or address number) for periodic cycle scanning, if there is no jump instruction, the user program is executed successively from the beginning of the instruction until the end of the program. Then a new command is returned to start the next round of scanning. In the process of each scan, it is necessary to complete the sampling of the input signal and refresh the output state.
A PLC scan cycle must be input sampling, program execution and output refresh three stages.
In the input sampling stage, PLC first reads the on-off status or input data of all the input terminals that temporarily exist in the input latch in order by scanning, and writes it into the corresponding input status register, that is, refresh the input. Then close the input port and enter the program execution phase.
PLC in the program execution stage: scan and execute each instruction according to the sequence of user program instructions stored, after the corresponding operation and processing, the result is written into the output status register, and all the contents of the output status register change with the execution of the program.
Output refresh stage: When all instructions are executed, the on-off state of the output status register is sent to the output latches in the output refresh stage, and output by a certain way (relay, transistor or thyristor) to drive the corresponding output device.
公司介紹：
成都陽(yáng)光不斷創(chuàng)新致力于提升停產(chǎn)的自動(dòng)化零件供應(yīng)水平，無(wú)論客戶(hù)身處何地，無(wú)論所需配件多么稀有，我們總能將客戶(hù)與所需產(chǎn)品緊密連接 ，成都陽(yáng)光零部件覆蓋廣泛。
急切需要自動(dòng)化或控制零件？ 全新、Used和已停產(chǎn)的自動(dòng)化機(jī)械零件的全球供應(yīng)商。
客戶(hù)支持快速響應(yīng)
合作伙伴網(wǎng)絡(luò)橫跨各個(gè)大洲
全球合作伙伴網(wǎng)絡(luò)




Company Introduction:
Chengdu Sunshine Xihe Co., Ltd. specializes in one-stop procurement consulting for imported industrial spare parts, offering original equipment and professional discontinued parts services. We are committed to providing efficient and reliable automation solutions for our customers. Customer support fast responseThe network of partners spans all continentsGlobal partner networkAlways achieve more delivery, be it parts, service or speed



始終實(shí)現(xiàn)更多的交付，無(wú)論是零件、服務(wù)還是速度

相關(guān)產(chǎn)品