SIMATIC Structured Control Language (SCL) for S7-300/S7 ...

1 Preface, ContentsPart 1: Designing ProgramsPart 2: Operating and DebuggingPart 3: Language DescriptionAppendixGlossary, IndexStructured Control Language (SCL) for S7-300/S7 -400 ProgrammingManualThis manual has the order number:6ES7811-1CA02-8BA0 SIMATICiiStructured Control Language (SCL) for S7-300/S7 -400, ProgrammingC79000 G7076 C522 01 This manual contains notices which you should observe to ensure your own personal safety, as well as toprotect the product and connected equipment. These notices are highlighted in the manual by a warningtriangle and are marked as follows according to the level of danger:!Dangerindicates that death, severe personal injury or substantial property damage will result if proper precautions arenot taken.

2 !Warningindicates that death, severe personal injury or substantial property damage can result if proper precautions arenot taken.!Cautionindicates that minor personal injury or property damage can result if proper precautions are not your attention to particularly important information on the product, handling the product, or to a particularpart of the device/system may only be set up and operated in conjunction with this qualified personnel should be allowed to install and work on this equipment. Qualified persons aredefined as persons who are authorized to commission, to ground, and to tag circuits, equipment, andsystems in accordance with established safety practices and the following:!

3 WarningThis device and its components may only be used for the applications described in the catalog or the technicaldescription, and only in connection with devices or components from other manufacturers which have beenapproved or recommended by , SIMATIC NET and SIMATIC HMI are registered trademarks of SIEMENS parties using for their own purposes any other names in this document which refer totrademarks might infringe upon the rights of the trademark have checked the contents of this manual for agreement with thehardware and software described. Since deviations cannot be precludedentirely, we cannot guarantee full agreement. However, the data in thismanual are reviewed regularly and any necessary corrections included insubsequent editions.

4 Suggestions for improvement are welcomed. Siemens AG 1998 Technical data subject to of LiabilityCopyright Siemens AG 1998 All rights reservedThe reproduction, transmission or use of this document or its contents isnot permitted without express written authority. Offenders will be liable fordamages. All rights, including rights created by patent grant or registrationof a utility model or design, are AGBereich Automatisierungs- und AntriebstechnikGeschaeftsgebiet Industrie-AutomatisierungssystemePostfac h 4848, D-90327 NuernbergSiemens Aktiengesellschaft6ES7811-1CA02-8BA0 Safety GuidelinesQualified PersonnelCorrect UsageTrademarksiiiStructured Control Language (SCL) for S7-300/S7 -400, ProgrammingC79000-G7076-C522-01 PrefaceThis manual is your guide to creating user programs in the Structured ControlLanguage (SCL) programming Language .

5 The manual explains the basicprocedures for creating programs using the SCL editor, SCL compiler andSCL manual also includes a reference section that describes the syntax andfunctions of the Language elements of manual is intended for S7 programmers, commissioning engineers, andmaintenance/service personnel. A working knowledge of automationprocedures is manual is valid for release of the STEP 7 standard programmingsoftware corresponds to the Structured Control Language defined in theDIN EN-61131-3 (IEC 1131-3) standard, although there are essentialdifferences with regard to the operations. For further details, refer to the tableof standards in the STEP 7 file of theManualCompliance withStandardsivStructured Control Language (SCL) for S7-300/S7 -400, ProgrammingC79000-G7076-C522-01 There is a wide range of both general and task-oriented user documentationavailable to support you when configuring and programming an S7programmable controller.

6 The following descriptions and the figure belowwill help you to find the user documentation you FBD SCLCFCs forS7 ReferenceManualProgr. ManualUserManualGRAPHfor S7 HiGraph/234//231//233//236//250//254//25 1//252//xxx/: Number in the list of references/235/System Software for S7-300/S7 -400 Program DesignStandard Software for S7 and M7 STEP 7 Primer/30/S7-300 Programmable ControllerQuick StartSystem Software forS7-300/400 System and StandardFunctionsUserManual/230/Standard Software for S7 Converting S5 ProgramsLanguage PackagesOnline HelpThis symbol indicates the order in which you should read themanuals, particularly if you are a first-time user of documentation introduces the is a reference manual on a specific documentation is supported by online on S7-300/S7 -400 HardwareManual STL/232/Overview of theSTEP 7 DocumentationPrefacevStructured Control Language (SCL)

7 For S7-300/S7 -400, ProgrammingC79000-G7076-C522-01 Table 1-1 Summary of the DocumentationTitleSubjectS7-300 ProgrammableLogic ControllerQuick Start, PrimerThe primer provides you with a very simple introduction to the methods ofconfiguring and programming an S7-300/400. It is particularly suitable for first-timeusers of an S7 programmable Program DesignProgramming ManualThe S7-300/400 Program Design programming manual provides you with thebasic information you require about the structure of the operating system and a userprogram for an S7 CPU. First-time users of an S7-300/400 should read this manual toget a basic overview of programming methods on which to base the design of a System andStandard FunctionsReference ManualThe S7 CPUs have system functions and organization blocks integrated in theoperating system that can be used when programming .

8 The manual provides youwith an overview of the system functions, organization blocks and loadable standardfunctions available with an S7 programmable controller and contains detailedinterface descriptions explaining how to use the functions and blocks in your 7 User ManualThe STEP 7 User Manual explains the basic use and functions of the STEP 7automation software. Whether you are a first-time user of STEP 7 or an experiencedSTEP 5 user, the manual will provide you with an overview of the procedures forconfiguring, programming and getting started with an S7-300/400 programmablecontroller. When working with the software, you can call up the online help whichsupports you with information about specific details of the S5 ProgramsUser ManualYou require the Converting S5 Programs User Manual if you want to convertexisting S5 programs and to run them on S7 CPUs.

9 The manual explains how to usethe converter. The online help system provides more detailed information about usingthe specific converter functions. The online help system also includes an interfacedescription of the available converted S7 , LAD, FBD, SCL1 ManualsThe manuals for the Language packages STL, LAD, FBD, and SCL contain bothinstructions for the user and a description of the Language . To program anS7-300/400, you only require one of the languages, but you can, if required, mix thelanguages within a project. When using one of the languages for the first time, it isadvisable to familiarize yourself with the methods of creating a program as explainedin the working with the software, you can use the online help system which providesyou with detailed information about using the editors and , HiGraph1,CFC1 ManualsThe GRAPH, HiGraph, and CFC languages provide you with optional methods forimplementing sequential Control systems, status Control systems, or graphicalinterconnection of blocks.

10 The manuals contain both the user instructions and thedescription of the Language . When using one of these languages for the first time, it isadvisable to familiarize yourself with the methods of creating a program based on the S7-300 and S7-400 Program Design manual. When working with the software,you can also use the online help system (with the exception of HiGraph) whichprovides you with detailed information about using the editors and package for system software for S7-300/S7 -400 PrefaceviStructured Control Language (SCL) for S7-300/S7 -400, ProgrammingC79000-G7076-C522-01To use this SCL manual effectively, you should already be familiar with thetheory behind S7 programs.