s7-300400 系统、维护与编程综合课程a7111serv2_01c_dbs

1、SIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.1数据块中的数据存储SIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.2目标学习了本章之后，你将 .懂得全局数据块的用途.熟悉基本和复杂数据类型.能够对带有单元变量的数据块.熟悉并能够应用编址数据块

2、变编辑、存储和下装到CPU 量SIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.3数据存储区位存储器PIQ. .PII.I/O 区L 堆栈数据块DBzDByDBxSIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.4数据块 (DB)所有块可以访问FB

3、1的背景DB背景数据DB5功能块FB1功能FC20全局数据DB20功能FC10OB1SIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.5STEP 7数据类型概述基本数据 位数据类型 (BOOL, BYTE, WORD, DWORD, CHAR)类型 数学数据类型 (INT, DINT, REAL)(到32 位) 定时器类型 (S5TIME, TIME, DATE, TIME_OF_DAY)复杂数据 时间 (DATE_AN

4、D_TIME)类型 矩阵 (ARRAY)(长于32位) 结构 (STRUCT) 字符串 (STRING)用户定义数据类型(长于 32 位)数据类型 UDT (用户定义数据类型)STEP 7基本数据类型SIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.6关键字长度 (位)该类型的常数举例BOOL BYTE WORD DWORD CHAR1816328True 或 False （1 或0）B#16#A9 W#16#12AF

5、DW#16#ADAC1EF5 w S5TIME16S5T#5s_200msINT DINT REAL163232123L#655391.2 或 34.5E-12TIME DATETIME_OF_DAY321632T#2D_1H_3M_45S_12MS D#1993-01-20 TOD#12:23:45.12SIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.7建立新数据块SIMATIC S7Siemens AG 2003.

6、 All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.8输入、保存、下载和监视数据块Data ViewDeclaration View寻址数据单元8 位70数据字节 0数据字节 1数据字节 2数据字节 3DBB 0DBW 0DBD 0DBX 4.1DBD 8188DBW 8190DBB 8191数据字节 8191SIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and

7、DrivesDate: File:2018/10/1DBs.9SIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.10访问数据单元完全表示访问传统访问方法绝对寻址符号寻址OPNValuesADBX 0.0或ADB99.DBX0.0或AValues.StatusOPNDB 99LDBB 1或LDB99.DBB1或LValues.StatesOPNValues或TDB99.DBW2或T Values.Number TDBW 2

8、OPNDB 99LDBD 8或LDB99.DBD8或L Values.Weight2DB 99ValuesAdd.NameType0.0StatusBOOL1.0StatesBYTE2.0NumberINT4.0Weight1REAL8.0Weight2REALSIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.11练习: 计数传送的零件 (FC 18, DB 18):ACTUAL-number of parts QW 6

9、SETPOINT-number of partsIW 2ACTUAL=SETPOINT Q 8.4传送带模型 - LED0815CPU 程序: DB 18, FC 18模拟器练习: 计数传送的零件(FC 18), 答案提示NW 1:Set counter to 0复位的条件DB_Parts.ACT_Number_of_parts0NW 2:Counting using memory word, ACTUAL number of parts计数的上升沿DB_Parts.ACT_Number_of_partsDB_Parts.ACT_Number_of_parts1NW 3:Display ACT

10、UAL number of parts on BCD digital display零件的实际值(DB_Parts.ACT_Number_of_parts)从整数到BCD转换-结果在 BCD 数字显示 ( QW 6)NW 4:Readin SETPOINT number of parts and convert from BCD to Integer来自数码拨轮 ( IW 2)的值从 BCD 转换到整数- 把零件的给定值 (Integer)存储在 MW 200NW 5:ACTUAL-SETPOINT comparison, LED (red LED Q8.4)比较实际值 (“DB_Parts”

11、.ACT_Number_of_parts)和给定值(MW 200),比较的结果送到红色的LEDSIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.12ADD_IENENOIN1OUTIN2MOVEENOUTINENOSIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/

12、10/1DBs.13初始值、实际值、初始化、记忆Upload in PGInitialize data block带初始值的DB带实际值的DB带初始值（实际值） 的DBSTEP 7programWork memory带实际值的DBLoad memory带初始值（实际值） 的DBSIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.14如果你想知道更多复杂数据类型SIMATIC S7Siemens AG 2003. All r

13、ights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.15关键字长度 (位)举例DATE_AND_TIME64DT#97-09-24-12:14:55.0STRING(最多254个字符的字符串)8 * (字符个数+2 )This is a stringSIEMENSARRAY(相同数据类型的元素组)用户定义Measured values ： ARRAY1.20INTSTRUCT(不同数据类型的元素组)用户定义Motor: STRUCT Speed : INT Current: REALE

14、ND_STRUCTUDT(用户定义数据类型 = 基本或复杂数据类型组成的模板）用户定义UDT 作为块UDT作为array 元素STRUCTSpeed : INT Current: REALEND_STRUCTDrive: ARRAY1.4UDT1SIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.16矩阵举例Measuring_point带有名字“Measuring_point” 的矩阵 (相同数据类型的几个元素)程序编辑

15、器中的显示 (数据块 DB 2):10. Measuring_point, data type Real1. Measuring_point, data type Real2. Measuring_point, data type Real3. Measuring_point, data type RealSIMATIC S7Siemens AG 2003. All rights reserved.SITRAIN Training for Automation and DrivesDate: File:2018/10/1DBs.17结构举例Motor_data带有名字“Motor_data” 的结构(不同数据类型的几个元素)程序编辑器中的显示 (数据块 DB 1):Speed, data type IntegerRated_current, data type RealStarting_current, data type RealDirection,