Siemens S7-1500 - Table of Contents

Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC
7
Table of contents
Preface ................................................................................................................................................... 3
1 Documentation guide .............................................................................................................................. 8
2 Memory areas and retentive memory .................................................................................................... 13
2.1 Memory areas ......................................................................................................................... 13
2.1.1 Specifics of the CPUs of the redundant system S7-1500R/H ................................................ 16
2.2 Memory requirements and memory usage ............................................................................. 18
2.3 Retentive memory areas ......................................................................................................... 26
2.4 Summary of retentive behavior ............................................................................................... 30
2.4.1 Retentive behavior of the memory objects ............................................................................. 30
2.5 Memory behavior when loading software changes ................................................................ 32
2.6 Memory requirements for downloading software changes ..................................................... 34
3 Memory usage and application examples .............................................................................................. 38
3.1 Memory usage for recipes ...................................................................................................... 38
3.2 Memory usage for data logging .............................................................................................. 43
3.2.1 Overview of data logging ........................................................................................................ 43
3.2.2 Data structure of the data logs ................................................................................................ 45
3.2.3 Instructions for data logging .................................................................................................... 46
3.2.4 Example program for data logging .......................................................................................... 47
3.2.5 Calculation of the data log size ............................................................................................... 53
4 SIMATIC memory card .......................................................................................................................... 57
4.1 SIMATIC memory card - Overview ......................................................................................... 57
4.2 Setting the card type ............................................................................................................... 64
4.3 Data transfer with SIMATIC memory cards ............................................................................ 65
4.4 Service life of the SIMATIC memory card ............................................................................... 68
4.5 Expanding the load memory of the CPUs of the redundant system S7-1500R/H .................. 73
Glossary ............................................................................................................................................... 74
Index..................................................................................................................................................... 80