GE PACSystems RXi User Manual page 8

5.5.1
5.5.2
5.6
5.7
5.8
5.8.1
5.8.2
5.8.3
5.8.4
5.9
5.9.1
5.9.2
5.9.3
5.9.4
5.10
5.10.1
5.11
5.11.1
5.11.2
5.11.3
Chapter 6
6.1
6.1.1
6.1.2
6.1.3
6.1.4
6.1.5
6.1.6
6.1.7
6.1.8
6.1.9
6.2
6.3
6.3.1
6.3.2
6.3.3
Chapter 7
7.1
7.1.1
7.1.2
GFK-2816F
CPU Stop Modes ........................................................................................... 81
Stop-to-Run Mode Transition ......................................................................... 82
Flash Memory Operation ......................................................................................... 83
Logic/Configuration Source and CPU Operating Mode at Power-up ...................... 84
Clocks and Timers ................................................................................................... 86
Elapsed Time Clock ....................................................................................... 86
Time of Day Clock .......................................................................................... 86
Watchdog Timers ........................................................................................... 87
Timed Contacts .............................................................................................. 88
System Security....................................................................................................... 89
Passwords and Privilege Levels - Legacy Mode .......................................... 89
OEM Protection - Legacy Mode .................................................................... 90
Enhanced Security for Passwords and OEM Protection ............................... 91
Legacy/Enhanced Security Comparison ........................................................ 92
PACSystems I/O System ........................................................................................ 93
I/O System Diagnostic Data Collection .......................................................... 93
Power-Up and Power-Down Sequences ................................................................. 94
Power-Up Sequence ...................................................................................... 94
Power-Down Sequence ................................................................................. 94
Retention of Data Memory across Power Failure .......................................... 95
Program Organization ................................................................... 97
Structure of a PACSystems Application Program ................................................... 98
Blocks ............................................................................................................. 98
Functions and Function Blocks ...................................................................... 98
How Blocks Are Called .................................................................................. 98
Nested Calls ................................................................................................... 99
Types of Blocks .............................................................................................. 99
Local Data .................................................................................................... 110
Parameter Passing Mechanisms ................................................................. 111
Languages ................................................................................................... 112
RXi Controller Instruction Set....................................................................... 112
Controlling Program Execution .............................................................................. 115
Interrupt-Driven Blocks .......................................................................................... 116
Interrupt Handling ........................................................................................ 116
Configuring Timed Interrupts ....................................................................... 117
Interrupt Block Scheduling ........................................................................... 117
CPU Program Data ....................................................................... 119
Variables ................................................................................................................ 120
Mapped Variables ........................................................................................ 120
Symbolic Variables ...................................................................................... 120
August 2015
Contents
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