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9.6 Index Register (Z)
9.6.2 Switching scan/low speed exec. to Interrupt/fixed scan exec.
9
DEVICE EXPLANATION
(3) Processing of file register block No.
(a) When switching from scan/low speed execution type program to interrupt/
fixed scan execution type program
The CPU module saves the file register block No. of the scan/low speed execution
type program and passes it to the interrupt/fixed scan execution type program.
(b) When switching from interrupt/fixed scan execution type program to scan/
low speed execution type program
The CPU module restores the saved file register block No.
Diagram 9.64 File register block No. saving (protection)/restoration
[RSET K0]
Execution program
Block No. of file
register
Save area
Scan/low-speed
execution type
program
Switching Restored
Interrupt
program/fixed-cycle
execution type
program
Scan/low-speed
execution type
program
Block 1
Restored
Block 1Block 1Block 1 Block 1Block 0
Block 1
Transferred
Save
: Block 1 0
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