VII
OPERATING SYSTEMS OVERVIEW ...................................................................................................... 96
6.1 Operating System Overview ........................................................................................................... 97
6.2 Mode Selection ................................................................................................................................. 97
PROGRAMMING INFORMATION ............................................................................................................. 98
7.1 Devices Registers ........................................................................................................................... 99
7.2 Memory Allocation of XW, YW and MW ....................................................................................... 106
7.3 Index Modification .......................................................................................................................... 108
7.4 Real-time Clock / Calendar........................................................................................................... 110
7.5 User Program ................................................................................................................................. 111
7.5.1 Main Program ................................................................................................................ 111
7.5.2 Sub-Program # 1 ........................................................................................................... 112
7.5.3 Timer Interrupt Program ........................................................................................... 112
7.5.4 I/O Interrupt Program .................................................................................................... 112
7.5.5 Subroutines ................................................................................................................... 113
7.6 Programming Language ................................................................................................................ 114
7.7 Program Execution Sequence ..................................................................................................... 115
TROUBLESHOOTING .............................................................................................................................. 116
8.1 Troubleshooting Procedure .......................................................................................................... 117
8.1.1 Power Supply Check ..................................................................................................... 118
8.1.2 CPU Check ................................................................................................................... 118
8.1.3 Program Check ............................................................................................................. 118
8.1.4 Input Check ................................................................................................................... 119
8.1.5 Output Check ................................................................................................................ 120
8.1.6 Environmental Problem ................................................................................................ 121
8.2 Self Diagnostics ............................................................................................................................. 122
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