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CHAPTER9 DEVICES
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9.6 Index Register (Z)/Standard Device Resister (Z)
9.6.3 Switching from the scan execution type program to the interrupt/fixed scan execution type
program
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9.6.3 Switching from the scan execution type program to the interrupt/fixed scan
execution type program
The CPU module performs the following when switching from the scan execution type program to the interrupt/
fixed scan execution type program.
• Saving and restoring the index register data
• Saving and restoring block numbers of the file register
(1) Setting for saving and restoration
Saving and restoration setting can be enabled in the PLC system tab of the PLC parameter dialog box.
To disable writing to the index register in the interrupt/fixed scan execution type program, select "High speed
execution" in the Interrupt program/Fixed scan program setting area.
If this setting is enabled, the program will switch faster than before.
Figure 9.62 Interrupt/fixed scan program setting