描述

TC-FPCXX2

宏在軟件編程中非常重要。宏是由一段程序組成的命令，向子程序一樣，在一些場合它用來代替在編程過程中經(jīng)常出現(xiàn)的重復程序段?？删幊绦蚩刂破鳎≒LC）的工作方式一般為周期性循環(huán)掃描梯形圖，集中采樣輸入，集中驅(qū)動輸出。它的應用領(lǐng)域一般為以開關(guān)量為主的順控系統(tǒng)，但隨著PLC的不斷發(fā)展，其功能越來越強大，使用場合也越來越多，PLC廠商提供的軟件功能也越來越強，這使得在PLC編程過程中使用宏或子程序成為可能。使用宏或子程序可以完成某些應用指令中部存在的復雜處理，也可以是重復形式或同意處理的程序標準化，既減少了程序的長度，也使編程變的容易，提高了編程效率。目前在小型PLC中筆者還未見到可以使用子程序的產(chǎn)品，但富士電機的N系列PLC可以使用宏命令編程，下面就其使用情況和在使用中出現(xiàn)的問題作一些討論。

富士電機提供的宏命令分兩類,一類是它為用戶制作好的標準宏命令集,使用該宏命令及可以完成應用指令中沒有的某些復雜功能的處理任務；另一類就是用戶自己制作宏命令，用戶宏命令有調(diào)用部和執(zhí)行部組成，如圖1、圖2所示。用戶宏命令和主程序的關(guān)系如圖3所示。

由此可見在PLC中使用宏命令時，參數(shù)交換非常重要，也必不可少。富士電機為用戶提供了幾組字信息和位信息交換所使用的數(shù)據(jù)寄存器和輔助繼電器，其中每組字信息和位信息的入口參數(shù)和出口參數(shù)各有16個，富士電機還就參數(shù)交換順序、個數(shù)、使用指令以及在宏命令中使用定時器、微分指令等作了規(guī)定，編程順序必須符合圖1要求。

產(chǎn)品承諾：
保?證?全新原裝進口,
保?證?安全準時發(fā)貨，
保?證售后服務質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
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