859
Interrupt Control Instructions
Section 3-20
3-20-5 ENABLE INTERRUPTS: EI(694)
Purpose
Enables execution of all interrupt tasks that were disabled with DI(693).
When a CS1D CPU Unit for Single-CPU System or a CS1-H, CJ1-H, or CJ1M
CPU Unit is being used and the power OFF interrupt task is disabled, EI(694)
simultaneously releases the disabled power OFF interrupt processing.
Ladder Symbol
Variations
Applicable Program Areas
Description
EI(694) is executed from the main program to temporarily enable all interrupt
tasks that were disabled by DI(693). DI(693) disables all interrupts except the
power OFF interrupt (I/O interrupts, scheduled interrupts, and external inter-
rupts).
CS1-H, CJ1-H, and CJ1M CPU Units and Power OFF Interrupts
When a CS1-H, CJ1-H, and CJ1M CPU Unit is being used and power OFF
interrupt processing has been disabled with DI(693), EI(694) will also release
the hold on power OFF interrupt processing. After DI(593) has been executed,
the CPU Unit will not be reset even if a power interruption is detected. The
CPU Unit will be reset after all of the instruction s between DI(693) and
EI(694) have been executed. Refer to
3-20-4 DISABLE INTERRUPTS:
DI(693)
for details on using DI(693) to disable power OFF interrupt process-
ing.
Flags
Related Flags and Words
The following word is in the Auxiliary Area.
EI(694)
Variations
Executed Each Cycle for Normally ON
Condition
EI(694)
Executed Once for Upward Differentiation
Not supported
Executed Once for Downward Differentiation
Not supported
Immediate Refreshing Specification
Not supported
Block program areas
Step program areas
Subroutines
Interrupt tasks
OK
OK
OK
Not allowed
Name
Label
Operation
Error Flag
ER
ON if EI(694) is executed from an interrupt task.
OFF in all other cases.
Name
Address
Contents
Disable Setting for Power
OFF Interrupts
A530
A5A5 hex:
Enables the Disable Setting for Power
OFF Interrupts. Power OFF processing
(excluding execution of the Power OFF
interrupt task) is masked between the
DI(694) and EI(694) instructions, so
instructions up to EI(694) are exe-
cuted.
Any other value:
Disables the Power OFF Processing
mask.
Summary of Contents for SYSMAC CS1D-CPU**
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Page 185: ...146 List of Instructions by Function Code Section 2 4...
Page 1389: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2...
Page 1390: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits...
Page 1391: ...1352 ASCII Code Table Appendix A...