Interrupt Control Instructions - Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual

Interrupt Control Instructions

3-20 Interrupt Control Instructions
Outline of Interrupt Control Instructions
SET INTERRUPT MASK:
MSKS(690)
CLEAR INTERRUPT:
CLI(691)
READ INTERRUPT MASK:
MSKR(692)
DISABLE INTERRUPTS:
DI(693)
ENABLE INTERRUPTS:
EI(694)
Precautions in Using Interrupt Tasks
836
The CS/CJ-series CPU Units support the following interrupts. For details,
refer to the SYSMAC CS/CJ/NSJ Series Programmable Controllers Program-
ming Manual (W394).
Type
I/O Interrupts Interrupt input from the Interrupt
Input Unit on the CPU Rack
turns ON/OFF.
Scheduled Scheduled (fixed intervals)
Interrupts
Power OFF When power turns OFF (After
Interrupt the default power OFF detec-
tion time + power OFF detec-
tion delay time)
External When requested by an Special
Interrupts I/O Unit or CPU Bus Unit on the
CPU Rack or by an Inner Board
(CS Series only)
Both I/O interrupt tasks and scheduled interrupt tasks are masked (disabled)
when the PLC enters RUN mode. MSKS(690) can be used to unmask or
mask I/O interrupts and set the time intervals for scheduled interrupts.
Note The power OFF interrupt is set in the PLC Setup.
CLI(691) clears or retains recorded interrupt inputs for I/O interrupts or sets
the time to the first scheduled interrupt for scheduled interrupts. It also clears
or retains recorded high-speed counter interrupts for CJ1M CPU Units.
MSKR(692) reads the current interrupt processing settings that were set with
MSKS(690).
DI(693) disables execution of all interrupt tasks except the power OFF inter-
rupt.
EI(694) enables execution of all interrupt tasks except the power OFF inter-
rupt.
Precautions for All Interrupts
When IORF(097), FIORF(225) (CJ1-H-R only), IORD(222), or IOWR(223) is
being executed within an interrupt task to refresh I/O in a Special I/O Unit,
cyclic refreshing with that Special I/O Unit must be disabled in the PLC Setup.
If cyclic refreshing with the Special I/O Unit is enabled in the PLC Setup and
one of the following operations occurs during an interrupt task, a non-fatal
Duplicate Refresh Error will occur and the Interrupt Task Error Flag (A40213)
will be turned ON.
• I/O refreshing is performed for the same Special I/O Unit by IORF(097) or
FIORF(225) (CJ1-H-R only).
• The same Special I/O Unit's data area is read by IORD(222) or written by
IOWR(223).
Be sure that the interrupt task does not require more than 10 ms if a C200H
Special I/O Unit or SYSMAC BUS Remote I/O Slave Rack is connected. If an
Execution condition
Section 3-20
Setting procedure
Use the MSKS instruction to assign
inputs from Interrupt Input Units on
the CPU Rack.
Use the MSKS instruction to set the
interrupt interval. See Scheduled
Interrupt Time Units in PLC Setup.
See Power OFF Interrupt Task and
Power OFF Detection Delay Time in
PLC Setup.
None (always valid)