GE PACSystems RX7i

GFK-2950C February 2018 i
Table of Contents
RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual GFK-2950C
Table of Contents ............................................................................................................................................... i
Table of Figures ............................................................................................................................................... xii
Chapter 1 Introduction ......................................................................................................................... 1
1.1 Revisions in this Manual ........................................................................................................... 2
1.2 PACSystems Programming and Configuration .................................................................. 3
1.3 Migrating Series 90 Applications to PACSystems ............................................................. 3
1.4 PACSystems Documentation ................................................................................................. 4
Chapter 2 Program Organization ....................................................................................................... 5
2.1 Structure of a PACSystems Application Program ............................................................. 6
2.1.1 Blocks................................................................................................................................................................................ 6
2.1.2 Functions and Function Blocks .............................................................................................................................. 6
2.1.3 How Blocks Are Called ............................................................................................................................................... 7
2.1.4 Nested Calls ................................................................................................................................................................... 7
2.1.5 Types of Blocks ............................................................................................................................................................. 8
2.1.6 Local Data .................................................................................................................................................................... 18
2.1.7 Parameter Passing Mechanisms ........................................................................................................................ 19
2.1.8 Languages .................................................................................................................................................................... 21
2.2 Controlling Program Execution ............................................................................................ 24
2.3 Interrupt-Driven Blocks ......................................................................................................... 25
2.3.1 Interrupt Handling .................................................................................................................................................... 26
2.3.2 Timed Interrupts ....................................................................................................................................................... 27
2.3.3 I/O Interrupts .............................................................................................................................................................. 27
2.3.4 Module Interrupts ..................................................................................................................................................... 27
2.3.5 Interrupt Block Scheduling .................................................................................................................................... 28
Chapter 3 Program Data ..................................................................................................................... 29
3.1 Variables .................................................................................................................................... 30
3.1.1 Mapped Variables ..................................................................................................................................................... 30
3.1.2 Symbolic Variables ................................................................................................................................................... 31
3.1.3 I/O Variables ............................................................................................................................................................... 32
3.1.4 Arrays ............................................................................................................................................................................ 34
3.1.5 Variable Indexes and Arrays ................................................................................................................................. 34