| 以文本方式查看主題 - 曙海教育集團論壇 (http://www.scb-ycwb.com/bbs/index.asp) -- PLC編程系列 (http://www.scb-ycwb.com/bbs/list.asp?boardid=59) ---- 一個間接尋址的例子程序源代碼。討論下編程思想。完善代碼注釋 (http://www.scb-ycwb.com/bbs/dispbbs.asp?boardid=59&id=2328) |
| -- 作者：wangxinxin -- 發布時間：2010-12-9 10:19:41 -- 一個間接尋址的例子程序源代碼。討論下編程思想。完善代碼注釋 FUNCTION "DBtoDB" : VOID TITLE = AUTHOR : BaiZH FAMILY : IR NAME : DBtoDB VERSION : 0.1 VAR_INPUT SRC_DB : INT ; //Source DB Block Number SRC_SttAddr : INT ; //Start Address of the Sending Data in SRC_DB SendNum : INT ; //Words Number Need Sending DST_DB : INT ; //Destination DB Block Number DST_SttAddr : INT ; //Start Address of the Receiving Data in DST_DB END_VAR VAR_IN_OUT Enable : BOOL ; //Enable Bit END_VAR VAR_TEMP DB_LOAD_TEMP : INT ; Loop_Val : INT ; //Send Data Loop Value DB_SAVE : INT ; DI_SAVE : INT ; AR1_SAVE : DWORD ; AR2_SAVE : DWORD ; END_VAR BEGIN NETWORK TITLE =Send Data //Move data from DB to DB A #Enable; JCN END; TAR1 #AR1_SAVE; // Save AR and Opened DB TAR2 #AR2_SAVE; L DBNO; T #DB_SAVE; L DINO; T #DI_SAVE; L #SRC_DB; //Open DB T #DB_LOAD_TEMP; //這里為什么要多用個“#DB_LOAD_TEMP”臨時變量啊？ OPN DB [#DB_LOAD_TEMP]; L #DST_DB; //Open DB T #DB_LOAD_TEMP; OPN DI [#DB_LOAD_TEMP]; L #SRC_SttAddr; //Load Start Address SLD 3; //這里為什么用這個指令？有什么用？ LAR1 ; L #DST_SttAddr; SLD 3; LAR2 ; L #SendNum; LP1: T #Loop_Val; //Move Data L DBW [AR1,P#0.0]; T DIW [AR2,P#0.0]; +AR1 P#2.0; +AR2 P#2.0; L #Loop_Val; LOOP LP1; LAR1 #AR1_SAVE; //Recover Original AR and DB LAR2 #AR2_SAVE; OPN DB [#DB_SAVE]; OPN DI [#DI_SAVE]; SET ; R #Enable; END: NOP 0; END_FUNCTION <link href="/templates/xhtml2/skins/xhtml/digg/style3/style.css" type="text/css" rel="stylesheet"/> |