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S7 S7-1200 Programmable controller ________________________________________________________________________________________________________________________________________________________________________Preface Product overview 1Installation 2PLC concepts 3Device configuration 4Programming concepts 5Programming instructions 6PROFINET 7Point-to-Point (PtP) communications 8Online and diagnostic tools 9Technical specifications ACalculating a power budget BOrder numbers C SIMATIC S7 S7-1200 Programmable controller System Manual 11/2009 A5E02486680-02 Legal information 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. 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. 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. 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. 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. 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 NRNBERG GERMANY Ordernumber: 6ES7298-8FA30-8BH0 10/2009 Copyright Siemens AG 2009. Technical data subject to change S7-1200 Programmable controller System Manual, 11/2009, A5E02486680-023 Preface Purpose of the manual The S7-1200 series is a line of programmable logic controllers (PLCs) that can control a variety of automation applications. Compact design, low cost, and a powerful instruction set make the S7-1200 a perfect solution for controlling a wide variety of applications. The S7-1200 models and the Windows-based programming tool give you the flexibility you need to solve your automation problems. This manual provides information about installing and programming the S7-1200 PLCs and is designed for engineers, programmers, installers, and electricians who have a general knowledge of programmable logic controllers. Required basic knowledge To understand this manual, it is necessary to have a general knowledge of automation and programmable logic controllers. Scope of the manual This manual is valid for STEP 7 Basic V10.5 and the S7-1200 product family. For a complete list of the S7-1200 products described in this manual, refer to the technical specifications (Page 279). Certification, CE label, C-Tick, and other standards Refer to the technical specifications(Page 279) for more information.Service and support In addition to our documentation, we offer our technical expertise on the Internet at:http://www.siemens.com/automation/support-request Contact your Siemens distributor or sales office for assistance in answering any technical questions, for training, or for ordering S7 products. Because your sales representatives are technically trained and have the most specific knowledge about your operations, process and industry, as well as about the individual Siemens products that you are using, they can provide the fastest and most efficient answers to any problems you might encounter.Preface

S7 S7-1200 Programmable controller 4System Manual, 11/2009, A5E02486680-02 S7-1200 Programmable controller System Manual, 11/2009, A5E02486680-025 Table of contents Preface...................................................................................................................................................... 3 1Product overview..................................................................................................................................... 11 1.1Introducing the S7-1200 PLC.......................................................................................................11 1.2Signal boards ...............................................................................................................................13 1.3Signal modules ............................................................................................................................13 1.4Communication modules .............................................................................................................14 1.5STEP 7 Basic...............................................................................................................................14 1.5.1Different views to make the work easier ......................................................................................15 1.5.2Help when you need it .................................................................................................................16 1.6Display panels..............................................................................................................................19 2Installation ............................................................................................................................................... 21 2.1Installation and removal procedures............................................................................................24 2.1.1Installing and removing the CPU .................................................................................................26 2.1.2Installing and removing a signal module......................................................................................27 2.1.3Installing and removing a communication module.......................................................................29 2.1.4Installing and removing a signal board ........................................................................................30 2.1.5Removing and reinstalling the S7-1200 terminal block connector...............................................31 2.2Wiring guidelines..........................................................................................................................32 3PLC concepts .......................................................................................................................................... 37 3.1Execution of the user program.....................................................................................................37 3.1.1Operating modes of the CPU.......................................................................................................39 3.1.2Event execution priorities and queuing........................................................................................43 3.1.3CPU memory................................................................................................................................48 3.1.4Password protection for the S7-1200 CPU..................................................................................52 3.1.5Recovery from a lost password....................................................................................................53 3.2Data storage, memory areas and addressing..............................................................................53 3.3Data types....................................................................................................................................57 3.4Using a memory card...................................................................................................................61 3.4.1Inserting a memory card in the CPU............................................................................................62 3.4.2Configuring the startup parameter of the CPU before copying the project to the memory card ..............................................................................................................................................63 3.4.3Transfer card.......................................................................................