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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-L14D Series
Страница 2: ...CP1L L14D CP1L L20D CP1L M30D CP1L M40D CP1L CPU Unit Operation Manual Revised June 2007...
Страница 3: ...iv...
Страница 9: ...x...
Страница 13: ...xiv TABLE OF CONTENTS...
Страница 21: ...xxii...
Страница 33: ...xxxiv Conformance to EC Directives 6...
Страница 65: ...32 Function Blocks Section 1 5...
Страница 153: ...120 CP CPM1A series Expansion I O Unit Wiring Section 3 6...
Страница 523: ...490 Troubleshooting Unit Errors Section 9 4...
Страница 531: ...498 Replacing User serviceable Parts Section 10 2...
Страница 563: ...530 Auxiliary Area Allocations by Function Appendix C...
Страница 611: ...578 Auxiliary Area Allocations by Address Appendix D...
Страница 638: ...605 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 639: ...606 Connections to Serial Communications Option Boards Appendix F...
Страница 669: ...636 Index...
Страница 671: ...638 Revision History...