【正文】 W161 OW JU ove1END2: L 8 L W161001 OW JU ove1END5: L 8 JU ove1END3: R R L W160 T 36 L 8ove1: T 0ove2: NOP 0 L 36 T 0Network2從 DP 上寫數(shù)據(jù) OPN DB 6 CALL DPWR_DAT LADDR :=W16108 RECORD :=P BYTE 8 RET_VAL:=MW30Network3從 DP 上讀數(shù)據(jù) OPN DB 5 CALL DPRD_DAT LADDR :=W16108 RET_VAL:=MW32 RECORD :=P BYTE 8 Network4 OPN DB 4 OPN DB 6 L 0 ITD T MW 20 L MW 20 DTR T MD 80 OPN mun L MD 80 L mun.mun *R T mun.result L mun.result RND T MD 84 L MW 86 T MW 160 CLR A JC neg3 L MW 160 INVD T MW 160neg3: L MW 160 T 2Network5反轉(zhuǎn)取反碼判斷轉(zhuǎn)的方向 OPN DB 2 OPN mun L 2 //反饋值 T MW 15 ITD T MD 62 L MD 62 DTR //轉(zhuǎn)實數(shù) T MD 180 L MD 180 L mun.div //除除數(shù) /R T MD 184 L MD 184 RND //轉(zhuǎn)整數(shù) T MD 200 A JC end4 //正 L W16FFFF L MW 202 I L W161 +I T 6 L W160 T 4 JU ove4end4: L MW 202 //正 T 4 L W160 T 6ove4: NOP 0Network6 A( O O ) A DI_1 = DO_1Network7 OPN DB 5 L 4 ITD DTR L 8 /R RND T MD 280 NOP 0參考文獻[1] PLC 編程及應用[M].北京：[2] 控制系統(tǒng)設計與應用[M].北京：[3][M].北京：[4][D].重慶大學工程碩士學位論文.2022:3～6[5][M].西安：[6]馬寧 PLC 和 MM440 變頻器的原理與應用[M].[7][M].重慶：[8]西門子（中國） [9][M].北京：[10]肖峰 編程 100 例[M].[11][J].北京：[12]張運剛 宋小春 S7300/400 PLC 技術與應用[M].北京：[13]鄒家祥 [J].[14][J].[15][J]. [16][M].北京：[17][D].[18]—交變頻同步機系統(tǒng)的諧波分析及治理方案研究[D].[19]—交變頻同步電動機磁場定向矢量控制系統(tǒng)的設計與應用[D].山東大[20]盧艷軍 PLC 的 I/O 控制研究[J].～11[21]SIEMENS AG.. SIMATIC S7200 Programmable Controller System Manual. 2022外文資料Motivation Programmable Logic Controllers (PLC), a puting device invented by Richard E. Morley in 1968, have been widely used in industry including manufacturing systems, transportation systems, chemical process facilities, and many others. At that time, the PLC replaced the hardwired logic with softwired logic or socalled relay ladder logic (RLL), a programming language visually resembling the hardwired logic, and reduced thereby the configuration time from 6 months down to 6 days [Moody and Morley, 1999]. Although PC based control has started to e into place, PLC based control will remain the technique to which the majority of industrial applications will adhere due to its higher performance, lower price, and superior reliability in harsh environments. Moreover, according to a study on the PLC market of Frost and Sullivan [1995], an increase of the annual sales volume to 15 million PLCs per year with the hardware value of more than 8 billion US dollars has been predicted, though the prices of puting hardware is steadily dropping. The inventor of the PLC, Richard E Morley, fairly considers the PLC market as a 5billion industry at the present time. Though PLCs are widely used in industrial practice, the programming of PLC based control systems is still very much relying on trialanderror. Alike software engineering, PLC software design is facing the software dilemma or crisis in a similar way. Morley himself emphasized this aspect most forcefully by indicating [Moody and Morley, 1999, p. 110]:`If houses were built like software projects, a single woodpecker could destroy civilization.” Particularly, practical problems in PLC programming are to eliminate software bugs and to reduce the maintenance costs of old ladder logic programs. Though the hardware costs of PLCs are dropping continuously, reducing the scan time of the ladder logic is still an issue in industry so that lowcost PLCs can be used. In general, the productivity in generating PLC is far behind pared to other domains, for instance, VLSI design, where efficient puter aided design tools are in practice. Existent software engineering methodologies are not necessarily applicable to the PLC based software design because PLCprogramming requires a simultaneous consideration of hardware and software. The software design bees, thereby, more and more the major cost driver. In many industrial design projects, more than SO0/a of the manpower allocated for the control system design and installation is scheduled for testing and debugging PLC programs [Rockwell, 1999]. In addition, current PLC based control systems are not properly designed to support the growing demand for flexibility and reconfigurability of manufacturing systems. A further problem, impelling the need for a systematic design methodology, is the increasing software plexity in largescale projects. Objective and Significance of the Thesis The objective of this thesis is to develop a systematic software design methodology for PLC operated automation systems. The design methodology involves highlevel description based on state transition models that treat automation control systems as discrete event systems, a stepwise design pro