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Siemens CPU 948 - Program Execution

Siemens CPU 948
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Contents of Chapter 3
3.1 Principle of Program Execution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 4
3.2 Program Organization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 5
3.3 Storing Program and Data Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 10
3.4 Processing the User Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 11
3.4.1 Definition of Terms used in Program Execution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 12
3.5 STEP 5 Operations with Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 15
3.5.1 Basic Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 19
3.5.2 Programming Examples in the STL, LAD and CSF Methods of Representation . . . . . 3 - 34
3.5.3 Supplementary Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 49
3.5.4 Executive Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 59
3.5.5 Semaphore Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 75
3
Program Execution
CPU 948 Programming Guide
C79000-G8576-C848-04
3 - 1

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