河北联合大学轻工学院
QINGGONG COLLEGE, HEBEI UNITED UNIVERSITY
毕业设计说明书
设计题目：选矿厂磨矿S7-300PLC控制系统梯形图软件设计 学生姓名：*** 学 号：****** 专业班级：*****
学 部：信息科学与技术部 指导教师：*** 教授
2012年05月20日
摘 要 摘 要
选矿厂磨矿自动化主要围绕提高产量与品位，节能降耗，增加效益为目标。磨矿环节主要包括磨矿、分级、磁选、浓缩脱水、过滤、精矿输送等工序，从而筛选出高质量精矿。在工业生产中，常以可编程控制器（PLC）为下位机、以工业计算机为上位机，组成选矿厂磨矿环节集散控制系统。本设计正是完成基于西门子S7-300 PLC为控制器的选矿厂磨矿控制系统梯形图软件设计。
本设计中以S7-300 PLC为核心控制器，着重说明了选矿厂磨矿环节的控制流程、控制系统硬件配置、梯形图程序设计及整体系统的调试等情况。
关键词：磨矿；S7-300；STEP7 ；梯形图
-I-
Abstract Abstract
Ore dressing plant grinding automation focuses on increasing yield and quality, saving energy and reducing consumption, increase benefit to be a target. Grinding process includes grinding, classification, separation, dewatering, filtration,
concentrate transportation process, thereby screening out high quality concentrate. In industrial production, often with programmable controller ( PLC ) for the lower machine, industrial computer as upper machine, comprising part of the ore dressing plant distributed control system. The design is completed based on Siemens S7-300PLC as the controller of the ore dressing plant ladder diagram of control system software design.
This design using S7-300PLC as the core controller, emphasize the ore dressing plant process control process, control system hardware configuration, ladder diagram program design and system debugging etc.
Key words: grinding; S7-300; STEP7; ladder diagram
-II-
目 录 目 录
摘 要 ............................................................................................................................... I Abstract ......................................................................................................................... II 0 引 言 ...................................................................................................................... 1 1 绪 论 ...................................................................................................................... 2
1.1 磁铁矿选矿介绍 .............................................................................................. 2 1.2 选矿工艺及设备介绍 ...................................................................................... 2 2 选矿厂自动化系统总体设计方案 ............................................................................ 4
2.1 系统总体设计思想 .......................................................................................... 4 2.2 系统的基本功能 .............................................................................................. 4 2.3 系统的组成环节 .............................................................................................. 4 2.4 现场控制与远程控制 ...................................................................................... 5 3 可编程控制器和软件系统概述 ................................................................................ 7
3.1 可编程控制器（PLC）概述 .......................................................................... 7 3.2 STEP 7概述 ..................................................................................................... 9 3.3 状态法编程概述 ............................................................................................ 10 4 磨矿环节及其梯形图程序设计 .............................................................................. 12
4.1 磨矿环节控制流程 ........................................................................................ 14
4.1.1 远程控制 .............................................................................................. 15 4.1.2 现场控制 .............................................................................................. 16 4.1.3 系统启停顺序 ...................................................................................... 16 4.2 磨矿环节I/O点数统计及符号表 ................................................................ 17 4.3 磨矿环节PLC硬件系统组态和模块选型 .................................................. 23 4.4 磨矿环节梯形图程序 .................................................................................... 27
4.4.1 主循环程序块 OB1 ............................................................................ 27 4.4.2 模式控制程序块FC1 .......................................................................... 28 4.4.3 给料自动运行程序块 FC13 ............................................................... 30 4.4.4 手动模式程序块 FC114 ..................................................................... 32
-III-