s 
                                                                Preface, Contents 
                                                                                                      1 
                                                                Bit Logic Instructions 
            SIMATIC                                                                                   2 
                                                                Comparison Instructions 
                                                                                                      3 
            Ladder Logic (LAD) for S7-300  Conversion Instructions 
                                                                                                      4 
            and S7-400 Programming                              Counter Instructions 
                                                                                                      5 
                                                                Data Block Instructions 
            Reference Manual                                     
                                                                Logic Control Instructions            6 
             
                                                                                                      7 
                                                                Integer Math Instructions 
                                                                                                      8 
                                                                Floating Point Math Instructions 
                                                                                                      9 
                                                                Move Instructions 
                                                                                                     10 
                                                                Program Control Instructions 
                                                                                                     11 
                                                                Shift and Rotate Instructions 
                                                                                                     12 
                                                                Status Bit Instructions 
                                                                                                     13 
                                                                Timer Instructions 
                                                                                                     14 
            This manual is part of the documentation            Word Logic Instructions 
            package with the order number:                                                              
            6ES7810-4CA07-8BW1                                  Appendix 
                                                                                                     A 
                                                                Overview of All LAD Instructions 
                                                                                                     B 
                                                                Programming Examples 
                                                                                                     C 
                                                                Working with Ladder Logic 
            Edition 01/2004                                     Index                                   
            A5E00261407-01 
             
                             
                            Safety Guidelines 
                                               This manual contains notices intended to ensure personal safety, as well as to protect the products and 
                                               connected equipment against damage. These notices are highlighted by the symbols shown below and 
                                               graded according to severity by the following texts: 
                             
                               !               Danger 
                                              indicates that death, severe personal injury or substantial property damage will result if proper 
                                               precautions are not taken. 
                             
                               !               Warning 
                                              indicates that death, severe personal injury or substantial property damage can result if proper 
                                               precautions are not taken. 
                             
                               !               Caution 
                                              indicates that minor personal injury can result if proper precautions are not taken. 
                             
                                               Caution 
                                               indicates that property damage can result if proper precautions are not taken. 
                                                
                                               Notice 
                                               draws your attention to particularly important information on the product, handling the product, or to a 
                                               particular part of the documentation. 
                             
                            Qualified Personnel 
                                               Only qualified personnel should be allowed to install and work on this equipment. Qualified persons are 
                                               defined as persons who are authorized to commission, to ground and to tag circuits, equipment, and 
                                               systems in accordance with established safety practices and standards. 
                            Correct Usage 
                                               Note the following: 
                             
                               !               Warning 
                                              This device and its components may only be used for the applications described in the catalog or the 
                                               technical description, and only in connection with devices or components from other manufacturers 
                                               which have been approved or recommended by Siemens. 
                                                
                                               This product can only function correctly and safely if it is transported, stored, set up, and installed 
                                               correctly, and operated and maintained as recommended. 
                            Trademarks 
                                               SIMATIC®, SIMATIC HMI® and SIMATIC NET® are registered trademarks of SIEMENS AG.  
                                               Third parties using for their own purposes any other names in this document which refer to trademarks might 
                                               infringe upon the rights of the trademark owners. 
                            Copyright © Siemens AG 2004 All rights reserved                           Disclaimer of Liability 
                            The reproduction, transmission or use of this document or its             We have checked the contents of this manual for agreement with 
                            contents is not permitted without express written authority.              the hardware and software described. Since deviations cannot be 
                            Offenders will be liable for damages. All rights, including rights        precluded entirely, we cannot guarantee full agreement. However, 
                            created by patent grant or registration of a utility model or design,     the data in this manual are reviewed regularly and any necessary 
                            are reserved.                                                             corrections included in subsequent editions. Suggestions for 
                                                                                                      improvement are welcomed. 
                                                                                                       
                                                                                                       
                            Siemens AG                                                                 
                            Bereich Automation and Drives                                              
                            Geschaeftsgebiet Industrial Automation Systems                            ©Siemens AG 2004 
                            Postfach 4848, D- 90327 Nuernberg                                         Technical data subject to change. 
                            Siemens Aktiengesellschaft                                                A5E00261407-01 
                             
                             
                             
             Preface 
             Purpose 
                    This manual is your guide to creating user programs in the Ladder Logic (LAD) 
                    programming language. 
                    This manual also includes a reference section that describes the syntax and 
                    functions of the language elements of Ladder Logic. 
             Basic Knowledge Required 
                    The manual is intended for S7 programmers, operators, and maintenance/service 
                    personnel.  
                    In order to understand this manual, general knowledge of automation technology is 
                    required. 
                    In addition to, computer literacy and the knowledge of other working equipment 
                    similar to the PC (e.g. programming devices) under the operating systems 
                    MS Windows 2000 Professional or MS Windows XP Professional are required. 
             Scope of the Manual 
                    This manual is valid for release 5.3 of the STEP 7 programming software package. 
             Compliance with IEC 1131-3 
                    LAD corresponds to the “Ladder Logic” language defined in the International 
                    Electrotechnical Commission's standard IEC 1131-3. For further details, refer to the 
                    table of standards in the STEP 7 file NORM_TBL.WRI. 
             Ladder Logic (LAD) for S7-300 and S7-400 Programming 
             A5E00261407-01                                       iii 
                     Preface 
                     Requirements 
                                   To use this Ladder Logic manual effectively, you should already be familiar with the 
                                   theory behind S7 programs which is documented in the online help for STEP 7. 
                                   The language packages also use the STEP 7 standard software, so you should be 
                                   familiar with handling this software and have read the accompanying 
                                   documentation. 
                                   This manual is part of the documentation package "STEP 7 Reference". 
                                   The following table displays an overview of the STEP 7 documentation: 
                                    
                      Documentation Purpose Order Number 
                      STEP 7 Basic Information with               Basic information for technical    6ES7810-4CA07-8BW0 
                      •   Working with STEP 7 V5.3,               personnel describing the methods 
                          Getting Started Manual                  of implementing control tasks with 
                      •   Programming with STEP 7 V5.3            STEP 7 and the S7-300/400 
                      •   Configuring Hardware and                programmable controllers. 
                          Communication Connections,  
                          STEP 7 V5.3 
                      •   From S5 to S7, Converter Manual  
                      STEP 7 Reference with                       Provides reference information     6ES7810-4CA07-8BW1 
                      •   Ladder Logic (LAD) / Function Block     and describes the programming 
                          Diagram (FDB) / Statement List (STL)    languages LAD, FBD and STL, 
                          for S7-300/400 manuals                  and standard and system function 
                      •   Standard and System Function            extending the scope of the  
                          for S7-300/400                          STEP 7 basic information.  
                                    
                                    
                      Online Helps                                Purpose                           Order Number 
                      Help on STEP 7                              Basic information on              Part of the STEP 7 
                                                                  programming and configuring       Standard software. 
                                                                  hardware with STEP 7 in the form 
                                                                  of an online help. 
                      Reference helps on AWL/KOP/FUP              Context-sensitive reference       Part of the STEP 7 
                      Reference help on SFBs/SFCs                 information.                      Standard software. 
                      Reference help on Organization Blocks 
                                                                           Ladder Logic (LAD) for S7-300 and S7-400 Programming 
                     iv                                                                                      A5E00261407-01