Function Block Diagram (FBD) for S7-300 and S7-400 …

1 SIMATIC Function Block Diagram (FBD) for S7-300 and S7-400 Programming Reference Manual 05/2010 A5E02790131-01 This manual is part of the documentation package with the order number: 6ES7810-4CA10-8BW1 Bit Logic Instructions 1 Comparison Instructions 2 Conversion Instructions 3 Counter Instructions 4 Data Block Instructions 5 Jump Instructions 6 Integer Math Instructions 7 Floating-Point Math Instructions 8 Move Instructions 9 Program Control Instructions 10 Shift and Rotate Instructions 11 Status Bit Instructions 12 Timer Instructions 13 Word Logic Instructions 14 Overview of All FBD Instructions A Programming Examples B Working with Function Block Diagram

2 C Legal information Warning notice system This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are graded according to the degree of danger. DANGER indicates that death or severe personal injury will result if proper precautions are not taken.

3 WARNING indicates that death or severe personal injury may result if proper precautions are not taken. CAUTION with a safety alert symbol, indicates that minor personal injury can result if proper precautions are not taken. CAUTION without a safety alert symbol, indicates that property damage can result if proper precautions are not taken. NOTICE indicates that an unintended result or situation can occur if the corresponding information is not taken into account. If more than one degree of danger is present, the warning notice representing the highest degree of danger will be used.

4 A notice warning of injury to persons with a safety alert symbol may also include a warning relating to property damage. Qualified Personnel The product/system described in this documentation may be operated only by personnel qualified for the specific task in accordance with the relevant documentation for the specific task, in particular its warning notices and safety instructions. Qualified personnel are those who, based on their training and experience, are capable of identifying risks and avoiding potential hazards when working with these products/systems.

5 Proper use of Siemens products Note the following: WARNING Siemens products may only be used for the applications described in the catalog and in the relevant technical documentation. If products and components from other manufacturers are used, these must be recommended or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and maintenance are required to ensure that the products operate safely and without any problems. The permissible ambient conditions must be adhered to.

6 The information in the relevant documentation must be observed. Trademarks All names identified by are registered trademarks of the Siemens AG. The remaining trademarks in this publication may be trademarks whose use by third parties for their own purposes could violate the rights of the owner. Disclaimer of Liability We have reviewed the contents of this publication to ensure consistency with the hardware and software described. Since variance cannot be precluded entirely, we cannot guarantee full consistency.

7 However, the information in this publication is reviewed regularly and any necessary corrections are included in subsequent editions. Siemens AG Industry Sector Postfach 48 48 90026 N RNBERG GERMANY A5E02790131-01 02/2010 Copyright Siemens AG 2010. Technical data subject to change Function Block Diagram (FBD) for S7-300 and S7-400 Programming Reference Manual, 05/2010, A5E02790131-01 3 Preface Purpose This manual is your guide to creating user programs in the Function Block Diagram (FBD) programming language.

8 The manual also includes a reference section that describes the syntax and functions of the language elements of Function Block Diagram . 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 ( programming devices) under the operating systems MS Windows XP, MS Windows Server 2003 or MS Windows 7 are required.

9 Scope of the Manual This manual is valid for release of the STEP 7 programming software package. Compliance with Standards FBD corresponds to the " Function Block Diagram " 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 Preface Function Block Diagram (FBD) for S7-300 and S7-400 Programming 4 Reference Manual, 05/2010, A5E02790131-01 Requirements To use the Function Block Diagram manual effectively, you should already be familiar with the theory behind S7 programs which is documented in the online help for STEP 7.

10 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 Working with STEP 7, Getting Started Manual Programming with STEP 7 Configuring Hardware and Communication Connections, STEP 7 From S5 to S7.