【正文】 same time not need to prepare the specialized clock signal, its characteristics to lie in, its data is partition, the longlost send out and accept, be the CPU is too busy of time can grind to a stop sex to work, also reduced the difficulty on the hardware, the data throw to lose at the same time opposite want to be little, we can pass the examination of the data to observe whether the data that we send out has the mistake or not, be like strange accidentally the method, tired addition and eight efficacies method etc., can use to helps whether the data that we examine to send out have or not the mistake occurrence, pass the feedback to carry on the discriminator. A line of transmission of the information contains a string of and bine the cent of: The usual PLC is 8 machines, certainly also having 16 machines. We can be at the time of sending out the data a send out to the other party, also can be 88 send out the data to the other party, an and 8 differentiations are also that we say to send out the data and bine sends out the data. A speed is more and slowly, but as long as 2 or three lines can solve problem, and can use 洛陽(yáng)理工學(xué)院畢業(yè)設(shè)計(jì)（論文） 24 the telephone line to carry on the long range control. But bine the oscular transmission speed is very quick of, it is a string of oscular of 25600%, occupy the advantage in the short distance, the in view of the fact TTL electricity is even, being limited by the scope of one meter generally, it bine unwell used for the data transmission of the long pull, thus the cost is too expensive. Under a lot of circumstances we are total to like to adopt the string to bine the conversion chip to carry on deliver, under this kind of circumstance not need us to carry on depositing the machine to establish too and plicatedly, but carry on the d。t guarantee the equipments by the control of the single machine, but pass the information exchanges of the equipments and equipments to attain the result that we want. For example fore pack and the examination of the empress work preface, we will arrive wrapping information feedback to examine the place, and examine the information of the place to also want the feedback to packing. Pass the information share thus to make both the chain connect, being a total body, the match of your that thus make is more close, at each other attain to reflect the result that mutually flick. 洛陽(yáng)理工學(xué)院畢業(yè)設(shè)計(jì)（論文） 22 The PLC correspondence has already e more body now its value, at the PLC and correspondence between PLCs, can pass the munication of the information and the share of the data to guarantee that of the equipments moderates mutually, the result that arrive already to repair with each other. Data conversion the adoption RS232 between PLC connect to e to the transmission data, but the RS232 pick up a people and can guarantee 10 meters only of deliver the distance, if in the distance of 1000 meters we can pass the RS485 to carry on the correspondence, the longer distance can pass the MODEL only to carry on deliver. The PLC data transmission is just to be called a form to it in a piece of and continuous address that the data of the inner part delivers the other party, we, the PLC of the other party passes to read data in the watch to carry on the operation. If the data that data in the watch is a to establish generally, that is just the general data transmission, for example today of oil price rise, I want to deliver the price of the oil price to lose the oil ally on board, that is the share of the data。s machine bine, for resolve the very plicated problem to look for the best path We e in sight of the control that links after the electric appliances in various situation, that is already the that time generation past, now of after use in the mold a perhaps simple equipments of grassroots control that the electric appliances can do for the low level, And the PLC emergence also became the epochmaking topic, adding the vivid software control through a very and stable hardware, making the automation head for the new high tide. The PLC biggest characteristics lie in: The electrical engineering teacher already no longer electric hardware up too many calculations of cost, as long 洛陽(yáng)理工學(xué)院畢業(yè)設(shè)計(jì)（論文） 20 as order the importation that the button switch or the importation of the sensors order to link the PLC up can solve problem, pass to output to order the conjunction contact machine or control the start equipments of the big power after the electric appliances, but the exportation equipments direct conjunction of the small power can. PLC internal containment have the CPU of the CPU, and take to have an I/ O for expand of exterior to connect a people39。 5． 變頻器如果要長(zhǎng)電纜運(yùn)行 時(shí)，此時(shí)要采取措施抑制長(zhǎng)電纜對(duì)地耦合電容的影響，避免變頻器出力不足，所以在這樣情況下，變頻器容量要放大一檔或者在變頻器的輸出端安裝輸出電抗器。 HMI 的選型 1． 基本功能： 設(shè)備工作狀態(tài)顯示，指示燈，按鈕，文字、圖形、曲線及工作模擬圖，數(shù)據(jù) 和 文字輸入操作生產(chǎn)配方存儲(chǔ)，設(shè)備生產(chǎn)數(shù)據(jù)記錄，簡(jiǎn)單的邏輯和數(shù)洛陽(yáng)理工學(xué)院畢業(yè)設(shè)計(jì)（論文） 17 值運(yùn)算，可連接多種工業(yè)控制設(shè)備 組網(wǎng) [12]，通信宏指令的調(diào)用，可以與多種機(jī)型的 PLC 相連接，不需要實(shí)物便可以進(jìn)行離線模擬。 表 31 M 點(diǎn)定義 對(duì)應(yīng) M 點(diǎn) 定義 備注 M0 啟動(dòng) M1 機(jī)械臂第一次上升 M2 滑行臺(tái) 前進(jìn) M3 機(jī)械臂下降 M4 加熱淬火并旋轉(zhuǎn) M5 機(jī)械臂第二次上升 M6 噴液并旋轉(zhuǎn) M7 行車倒退 2． I/O 分配表 ： 輸入信號(hào)為各控制按鈕和行程開(kāi)關(guān)，輸出信號(hào)為驅(qū)動(dòng)電機(jī)轉(zhuǎn)動(dòng)的線圈和相應(yīng)的指示燈。通過(guò) DVPEH2系列主機(jī)程式以指令 FROM/TO 來(lái)讀寫(xiě)模塊內(nèi)的數(shù)據(jù)。一般來(lái)說(shuō)，我們可以根據(jù)生產(chǎn)工藝要求，確定 I/O 點(diǎn)數(shù)和 I/O 點(diǎn)的類型（數(shù)字量、模擬量等），并列出 I/O 點(diǎn)清單。 感 應(yīng) 加 熱 電 源現(xiàn) 場(chǎng) 傳 感 信號(hào) ， 控 制 開(kāi) 關(guān)旋 轉(zhuǎn) 電 動(dòng) 機(jī)伺 服 電 動(dòng) 機(jī) 移 動(dòng) 電 動(dòng) 機(jī)現(xiàn) 場(chǎng) 繼 電 器電 磁 閥可 編 程 控 制 器 （ P L C ） D V P 3 2 E H 0 0 M 2觸 摸 屏 （ H M I ） D O P A 1 0 T H T D 1電 源 參 數(shù)設(shè) 定溫 度 參數(shù) 設(shè) 定操 作 界面系 統(tǒng) 模 擬報(bào) 警 顯示系 統(tǒng) 目 錄H M I 界 面變 頻 器 圖 31 系統(tǒng)總體框圖 洛陽(yáng)理工學(xué)院畢業(yè)設(shè)計(jì)（論文） 10 其中 PLC 和 HMI 通過(guò) RS232 通信線進(jìn)行數(shù)據(jù)傳輸 [15]。 本設(shè)計(jì)采用 HMI 和 PLC 實(shí)現(xiàn)對(duì)曲軸感應(yīng)加熱裝置的控制 ，圖 22 所示為數(shù)控系統(tǒng)控制框圖， GP477R 為帶觸摸屏的顯示操作終端，用于系統(tǒng)參數(shù)、淬火過(guò)程工藝參數(shù)顯示和輸入； FX2N128MR 為三菱 PLC，用于機(jī)床開(kāi)關(guān)量輸入輸出控制、加熱噴液定時(shí)控制等； FX2N2AD 用于加熱電源實(shí)際輸出電壓和電流檢測(cè)輸入； FX2N2DA 用于工件轉(zhuǎn)速和加熱電源輸出電壓控制 輸出； FX2N20GM 用于工件或變壓器等升降定位控制。