Siemens SIMATIC S7-1200 Manual page 8

Table of contents
3.10 Create an HMI screen ............................................................................................................ 50
3.11 Select a PLC tag for the HMI element ................................................................................... 51
4 PLC concepts made easy ..................................................................................................................... 53
4.1 Tasks performed every scan cycle ........................................................................................ 53
4.2 Operating modes of the CPU ................................................................................................. 55
4.3 Execution of the user program ............................................................................................... 56
4.3.1 Processing the scan cycle in RUN mode ............................................................................... 56
4.3.2 OBs help you structure your user program ............................................................................ 57
4.3.3 Event execution priorities and queuing .................................................................................. 58
4.4 Memory areas, addressing and data types ............................................................................ 61
4.4.1 Data types supported by the S7-1200 ................................................................................... 62
4.4.2 Addressing memory areas ..................................................................................................... 64
4.4.3 Accessing a "slice" of a tagged data type .............................................................................. 67
4.4.4 Accessing a tag with an AT overlay ....................................................................................... 68
4.5 Pulse outputs ......................................................................................................................... 70
5 Easy to create the device configuration ................................................................................................. 73
5.1 Uploading the configuration of a connected CPU .................................................................. 74
5.2 Adding a CPU to the configuration......................................................................................... 76
5.3 Changing a device ................................................................................................................. 77
5.4 Adding modules to the configuration ..................................................................................... 78
5.5 Configuration control .............................................................................................................. 79
5.6 Configuring the operation of the CPU and modules .............................................................. 80
5.6.1 System memory and clock memory provide standard functionality ....................................... 82
5.7 Configuring the IP address of the CPU .................................................................................. 85
5.8 Protecting access to the CPU or code block is easy ............................................................. 87
5.8.1 Know-how protection ............................................................................................................. 89
5.8.2 Copy protection ...................................................................................................................... 90
6 Programming made easy ...................................................................................................................... 93
6.1 Easy to design your user program ......................................................................................... 93
6.1.1 Use OBs for organizing your user program ........................................................................... 95
6.1.2 FBs and FCs make programming the modular tasks easy .................................................... 97
6.1.3 Data blocks provide easy storage for program data .............................................................. 98
6.1.4 Creating a new code block ..................................................................................................... 99
6.1.5 Creating reusable code blocks ............................................................................................. 100
6.1.6 Calling a code block from another code block ..................................................................... 101
6.2 Easy-to-use programming languages .................................................................................. 101
6.2.1 Ladder logic (LAD) ............................................................................................................... 102
6.2.2 Function Block Diagram (FBD) ............................................................................................ 103
6.2.3 SCL overview ....................................................................................................................... 103
6.2.4 SCL program editor .............................................................................................................. 104
6.3 Powerful instructions make programming easy ................................................................... 105
6.3.1 Providing the basic instructions you expect ......................................................................... 105
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Manual, 01/2015, A5E02486774-AG