Scan Time Structure; Initial Processing - Mitsubishi Electric Q01UCPU User Manual

2.4

Scan Time Structure

A CPU module sequentially performs the following processing in the RUN status. Scan time is the time required for all
processing and executions to be performed.
2.4.1

Initial Processing

The CPU module performs pre-processing required for program operations. The processing is performed only once
when any of the operations described in the following table is performed. When initial processing is completed, the
CPU module will enter the status set using the RUN/STOP/RESET switch. (
Initial processing item
The I/O module initialization
Boot from a memory card or SD memory card
PLC parameter check
Multiple CPU system parameter consistency check
Initialization of devices outside the latch range
(bit device: off, word device: 0)
Automatic I/O number assignment of mounted modules
CC-Link IE and MELSECNET/H information setting
Intelligent function module switch setting
CC-Link information setting
Ethernet information setting
Initial device value setting
Serial communication function setting
*1 The operation indicates that the status is changed back to RUN without resetting the module after any parameter or
program was changed in the STOP status. (The RUN/STOP/RESET switch is set from STOP to RUN (the RUN LED will
flash), then back to STOP and to RUN again.) Note that the PLS, P instruction (instruction for pulse conversion) may
not be executed properly with the above operation. This is because the previous information may not be inherited
depending on the program changes.
Power-on or reset
(
Initial processing
Refresh processing (
Program operation (
END processing
(
CPU module status
Powered-on Reset
CHAPTER 2 APPLICATION OF PROGRAMMING
Page 65, Section 2.4.1
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Page 66, Section 2.4.2
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Page 67, Section 2.4.3
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Page 68, Section 2.4.4
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Page 69, Section 2.5)
: Performed, × : Not performed
Changed from STOP to RUN
×
×
×
×
×
×
×
×
2
*1
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