plc siemens s7-300 cpu 312c manual

Download PLC Siemens S7-300 Cpu 312C Manual

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  • Contents

    Purpose of this Manual 1Guide to the S7-300Documentation 2Structure and CommunicationFunctions 3

    Memory Concept 4

    Cycle and Response Times 5

    Technical Data 6Technical Data for IntegratedI/Os (CPU 31xC only) 7Information about Upgrading to aCPU 31xC, 312, 314, 315-2 DP 8

    Glossary 9Index

    SIMATIC

    S7-300 Programmable ControllerCPU Specifications,CPUs 31xC and CPU 31x

    Reference Manual

    This manual is part of the documentationpackage with the order number:6ES7398-8FA10-8BA0

    Edition 09/2002A5E00105475-02

  • Copyright Siemens AG 2002 All rights reservedThe reproduction, transmission or use of this document or itscontents is not permitted without express written authority.Offenders will be liable for damages. All rights, including rightscreated by patent grant or registration of a utility model or design,are reserved.

    Siemens AGBereich Automation and DrivesGeschaeftsgebiet Industrial Automation SystemsPostfach 4848, D- 90327 Nuernberg

    Disclaimer of LiabilityWe have checked the contents of this manual for agreement withthe hardware and software described. Since deviations cannot beprecluded entirely, we cannot guarantee full agreement. However,the data in this manual are reviewed regularly and any necessarycorrections included in subsequent editions. Suggestions forimprovement are welcomed.

    Siemens AG 2002Technical data subject to change.

    Siemens Aktiengesellschaft A5E00105475-02

    Safety Guidelines

    This manual contains notices intended to ensure personal safety, as well as to protect the products andconnected equipment against damage. These notices are highlighted by the symbols shown below andgraded according to severity by the following texts:

    ! Dangerindicates that death, severe personal injury or substantial property damage will result if properprecautions are not taken.

    ! Warningindicates that death, severe personal injury or substantial property damage can result if properprecautions are not taken.

    ! Cautionindicates that minor personal injury can result if proper precautions are not taken.Cautionindicates that property damage can result if proper precautions are not taken.

    Notedraws your attention to particularly important information on the product, handling the product, or to aparticular part of the documentation.

    Qualified Personnel

    Only 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 standards.

    Correct Usage

    Note the following:

    ! WarningThis device and its components may only be used for the applications described in the catalog or thetechnical description, and only in connection with devices or components from other manufacturerswhich have been approved or recommended by Siemens.

    This product can only function correctly and safely if it is transported, stored, set up, and installedcorrectly, and operated and maintained as recommended.

    TrademarksSIMATIC, 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 mightinfringe upon the rights of the trademark owners.

  • S7-300: CPU Data: CPU 312, 312C, 313C, 313C-2 PtP, 313C-2 DP, 314, 314C-2 PtP, 314C-2 DP, 315-2 DPA5E00105475-02 iii

    Contents1 Purpose of this manual..................................................................................................1-1

    2 Guide to the S7-300 documentation .............................................................................2-1

    3 Structure and communication functions .....................................................................3-13.1 Operator control and display elements .............................................................3-13.2 SIMATIC Micro Memory Card (MMC)...............................................................3-53.3 Interfaces...........................................................................................................3-83.4 What do we mean by DPV1?..........................................................................3-103.5 Realtime clock.................................................................................................3-123.6 S7 Connections...............................................................................................3-133.7 Communications .............................................................................................3-173.8 Routing ............................................................................................................3-213.9 Data consistency.............................................................................................3-24

    4 Memory concept .............................................................................................................4-14.1 Memory areas ...................................................................................................4-14.1.1 Distribution of the memory ................................................................................4-14.1.2 Retentive memory .............................................................................................4-34.2 Memory functions..............................................................................................4-54.3 Address areas ...................................................................................................4-94.4 Handling of DB data ........................................................................................4-114.4.1 Recipes ...........................................................................................................4-114.4.2 Measurement value archives ..........................................................................4-134.5 Saving/fetching complete projects to/from Micro Memory Card .....................4-15

    5 Cycle and response times .............................................................................................5-15.1 Introduction........................................................................................................5-15.2 Cycle time..........................................................................................................5-25.2.1 Overview ...........................................................................................................5-25.2.2 Calculating the cycle time .................................................................................5-45.2.3 Different cycle times..........................................................................................5-75.2.4 Communication load .........................................................................................5-85.2.5 Cycle time extension as a result of testing and commissioning

    functions ..........................................................................................................5-105.3 Response time ................................................................................................5-115.3.1 Overview .........................................................................................................5-115.3.2 Shortest response time ...................................................................................5-135.3.3 Longest response time....................................................................................5-145.3.4 Reducing the response time with direct I/O access........................................5-155.4 Calculating method for calculating the cycle/response time...........................5-165.5 Interrupt response time ...................................................................................5-175.5.1 Overview .........................................................................................................5-175.5.2 Reproducibility of delay interrupts and watchdog interrupts ...........................5-195.6 Sample calculations ........................................................................................5-20

  • Contents

    S7-300: CPU Data: CPU 312, 312C, 313C, 313C-2 PtP, 313C-2 DP, 314, 314C-2 PtP, 314C-2 DP, 315-2 DPiv A5E00105475-02

    5.6.1 Example of cycle time calculation ...................................................................5-205.6.2 Sample of response time calculation ..............................................................5-215.6.3 Example of interrupt response time calculation ..............................................5-23

    6 Technical Data ................................................................................................................6-16.1 CPU 312............................................................................................................6-16.2 CPU 312C .........................................................................................................6-66.3 CPU 313C .......................................................................................................6-116.4 CPU 313C-2 PtP and CPU 313C-2 DP ..........................................................6-176.5 CPU 314..........................................................................................................6-246.6 CPU 314C-2 PtP and CPU 314C-2 DP ..........................................................6-296.7 CPU 315-2 DP.................................................................................................6-36

    7 Technical data for integrated I/Os (CPU 31xC only) ...................................................7-17.1 Arrangement and usage of integrated I/Os.......................................................7-17.2 Analog I/O ........................................

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