Initial Processing (When Powered On Or Switched To Run); I/O Refresh; Program Operation - Mitsubishi Electric MELSEC iQ-R Series User Manual

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, refer to the following.
Page 522 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.

I/O refresh

The module performs the following before starting program operation.
• ON/OFF data input from the input module/intelligent function module to the CPU module.
• ON/OFF data output from the CPU module to the output module/intelligent function module.
While constant scan is in progress, I/O refresh is performed after the waiting time for constant scan expires.

Program operation

According to the program settings, the module executes from step 0 through the END/FEND instruction for each program.
This program is referred to as a main routine program. A main routine program can be divided into subroutine programs. (
Page 114 Subroutine Program)
8 RUNNING A PROGRAM
82
8.1 Scan Configuration
*1
*2
Initial processing
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Initial processing (when
switched to RUN)
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