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CPU Unit Operation
Section 2-4
2-4
CPU Unit Operation
2-4-1
General Flow
The following flowchart shows the overall operation of the CPU Unit. First the
user program is executed and then I/O is refreshed and peripheral servicing is
performed. These processes are then repeated in cyclic fashion.
Startup
initialization
I/O refreshing
(even in
PROGRAM
mode)
Peripheral
servicing
Cycle time
Initialize hardware
memory and system work
area.
Detect I/O.
Automatically transfer data
from Memory Cassette.
Clear I/O memory.
Check user memory.
Clear forced status, etc.
Check the Battery.
Read DIP switch settings.
Check I/O bus.
Check user program
memory.
Overseeing
processing
Program
execution
Operation processing: Execute the user program.
Error processing: Turn OFF outputs. (Reset Units
for bus errors.)
After error: Clear I/O memory if an error occurs
(unless a FALS(007) instruction created the error).
Refresh data for the following Units.
CP-series Expansion Units and Expansion I/O Units
Perform the following servicing if any events have occurred.
Peripheral USB port servicing
Serial port servicing
Communications port servicing
Built-in flash memory access servicing
Memory Cassette access servicing
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Содержание CP1L CPU UNIT - 03-2009
Страница 1: ...Cat No W462 E1 06 CP1L CPU Unit SYSMAC CP Series CP1L L_0D_ CP1L M_0D_ OPERATION MANUAL...
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Страница 4: ...iv...
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Страница 22: ...xxii...
Страница 34: ...xxxiv Conformance to EC Directives 6...
Страница 70: ...36 Function Blocks Section 1 5...
Страница 584: ...550 Trouble Shooting Section 8 7...
Страница 627: ...593 Sample Application Section 9 12 Network Settings Network Tab Network Settings Driver Tab...
Страница 630: ...596 Sample Application Section 9 12...
Страница 654: ...620 Troubleshooting Unit Errors Section 11 4...
Страница 662: ...628 Replacing User serviceable Parts Section 12 2...
Страница 668: ...634 Standard Models Appendix A...
Страница 698: ...664 Auxiliary Area Allocations by Function Appendix C...
Страница 746: ...712 Auxiliary Area Allocations by Address Appendix D...
Страница 773: ...739 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 774: ...740 Connections to Serial Communications Option Boards Appendix F...
Страница 806: ...772 Index...
Страница 808: ...774 Revision History...