12.
12 -
22
OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU
12.1.5 Initial processing
Initial processing is the pre-processing for executing sequence operations.
The QnACPU executes it only once in the case of the CPU module status described in the
following table.
Once the initial processing is completed, the CPU module is placed into the operation
status set by the RUN/STOP switch.
: Executed : Not executed
*1
Indicates the case that the CPU enters RUN status without being reset after changing a
parameter or program in STOP status.
(The RUN/STOP key switch is operated as follows: STOP
RUN
(RUN LED is
flickering.)
STOP
RUN.)
Note that the instructions for conversion into pulse (PLS, P) may not function properly since
the previous information may not be retained depending on the program change (write during
RUN in STOP status, or write to PLC).
12.1.6 Refresh processing of I/O module
Refresh processing of I/O modules is executed.
(Refer to the QnACPU Programming Manual (Fundamentals).)
Item
Status of the CPU module
At Power ON
At RESET
STOP
RUN
Status*1
Initialization of I/O module
Initialization of devices outside latched range
(Bit device: OFF, Word device: 0)
Self-diagnostics
Auto allocation of module I/O No.
Setting MELSECNET/10 network info and MELSECNET(II)/B
data link info
Setting CC-Link info and MELSECNET/MINI-S3 info
Setting initial device values
Booting from memory card
Summary of Contents for Q2ACPU
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Page 221: ...12 12 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU ...
Page 222: ...12 13 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU ...
Page 237: ...12 28 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU MEMO ...
Page 271: ...16 13 16 POWER SUPPLY MODULE 4 Names and description of parts of the A66P ...
Page 343: ...21 21 13 MAINTENANCE AND INSPECTION 21 4 2 Replacement of the fuse for an output module ...
Page 357: ...22 12 22 TROUBLESHOOTING ...
Page 359: ...22 14 22 TROUBLESHOOTING MEMO ...
Page 429: ...App 32 APPENDICES Trigonometric function Classification Symbol Description ...
Page 537: ...App 140 APPENDICES REMARK 1 Message 1 An error code is displayed in 2 Alert 1 3 Alert 2 ...
Page 539: ...App 142 APPENDICES 2 Q2ACPU Q2ACPU S1 modules Unit mm inch ...
Page 541: ...App 144 APPENDICES 2 A66P power supply module Unit mm inch ...
Page 543: ...App 146 APPENDICES 3 A35B base unit 4 A38B A38HB A38HBEU base unit Unit mm inch Unit mm inch ...
Page 567: ...MEMO ...
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