Chapter 1 Running A Program; Scan Configuration; Initial Processing (When Powered On Or Switched To Run) - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

1
RUNNING A PROGRAM
1.1

Scan Configuration

The following shows the scan configuration of the CPU module.

Initial processing (when powered on or switched to RUN)

For the initial processing (when powered on or switched to RUN), the following processes are performed:
: Performed, : Not performed
Item
Booting from an SD memory card
Checking each parameter and program
Checking the consistency of parameters for the multiple CPU system configuration
Assigning the I/O number to the mounted module
Initializing and setting the information of each module
Initializing a device/label outside the latch range (Bit device: Off, Others: 0)
Setting the device/initial label value
*1 Checking each parameter and program takes time depending on the parameter setting and the number of programs, and thus the CPU
module may take time to respond to the peripheral.
*2 For details on the initial label value setting for the Process CPU and SIL2 Process CPU, refer to the following.
Page 322 LABEL INITIALIZATION FUNCTION
When functions that require an SD memory card are enabled and the status of the SD memory card is as follows, the initial
processing (when powered on or switched to RUN) takes time, and thus the CPU module may take time to respond to the
peripheral.
• A large number of files is stored in the SD memory card.
• The SD memory card is close to the end of life or it has reached the end of life.
1 RUNNING A PROGRAM
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1.1 Scan Configuration
*1
*2
CPU module internal operation
Structure of a scan
Initial processing (when powered on or switched to RUN)
I/O refresh
Program execution
END processing
Initial processing
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Initial processing (when
switched to RUN)
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