12.
12 -
24
OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU
12.2 Operation Processing of RUN, STOP, PAUSE, and STEP-RUN
The QnACPU has four kinds of operation statuses: RUN, STOP, PAUSE, and step
operation (STEP-RUN) statuses.
Operation processing of PLC CPU in each operation status is explained here.
(1) RUN status operation processing
(a) The RUN status represents a status in which sequence program operation is
repeated in the order from step 0
END (FEND) instruction
step 0.
(b) When entering the RUN status, the CPU outputs the output status data saved in
STOP status according to the output mode setting parameter for STOP
RUN.
(c) Processing time from switching STOP
RUN to the start of the sequence
program operation is usually one to three seconds, although it may vary
depending on the system configuration.
Note that it may be longer than this depending on the conditions.
(2) STOP status operation processing
(a) The STOP status is a status in which sequence program operation is stopped by
the RUN/STOP key switch or due to remote STOP (see Section 10.6.1).
(b) When entering the STOP status, the CPU saves the output status data and turns
all output points to OFF. Data memories except for output (Y) are retained.
(3) PAUSE status operation processing
(a) The PAUSE status represents a status in which operation of sequence program
is suspended with the output and data memory statuses retained. (Refer to
Section 10.6.3)
(4) Step operation (STEP-RUN) operation processing
(a) STEP operation is an operation mode in which operation processing of a
sequence program can be paused/continued by each instruction using GPP
function. (Refer to Section 8.7)
(b) Since an operation processing is paused while retaining the output and data
memories, the execution condition can be confirmed.
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 ...
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