Siemens SIMATIC S5-115U, User Manual

Page: 171 / 676

7 Introduction to STEP 5
7.1 Writing a Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 1
7.1.1 Methods of Representation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 1
7.1.2 Operand Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 3
7.1.3 Circuit Diagram Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 3
7.2 Program Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 4
7.2.1 Linear Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 4
7.2.2 Structured Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 5
7.3 Block Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 7
7.3.1 Organization Blocks (OBs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 8
7.3.2 Program Blocks (PBs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 11
7.3.3 Sequence Blocks (SBs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 11
7.3.4 Function Blocks (FBs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 11
7.3.5 Data blocks (DBs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 16
7.4 Program Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 18
7.4.1 RESTART Program Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 18
7.4.2 Cyclic Program Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 20
7.4.3 Time-Controlled Program Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 20
7.4.4 Interrupt-Driven Programming Execution . . . . . . . . . . . . . . . . . . . . . . 7 - 22
7.4.5 Handling Programming Errors and PLC Malfunctions . . . . . . . . . . . . 7 - 23
7.5 Processing Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 25
7.5.1 Modifying the Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 25
7.5.2 Modifying Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 25
7.5.3 Compressing the Program Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 25
7.6 Number Representation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 26
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EWA 4NEB 811 6130-02b