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CHAPTER6 FUNCTIONS
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6.22 H
igh Spe
ed Interr
upt F
unction
6.22.4
Restrictions
6.22.4Restrictions
This section describes restrictions on execution of the high speed interrupt function.
If the function is executed incorrectly, "WDT ERROR" may occur or the high speed interrupt may not be executed at
the specified intervals.
There are the following four kinds of restriction items
(1) Restrictions that apply to all the high speed interrupt setting
(2) Restrictions that apply to the high speed interrupt only
(3) Items that delay the high speed interrupt start due to disabled interrupt
(4) Items other than the above ((1) to (3))
The time required for running interrupt program once must not exceed the specified interrupt interval.
(If exceeded, the operation of the high speed interrupt cannot be guaranteed.)
(1) Restrictions that apply to all the high speed interrupt setting
(To the next page)
Table6.37 Restrictions that apply to all the high speed interrupt setting
Item
Restriction
When used
Base unit
QA1S5 B, QA1S6 B,
QA1S5 B/A1S6 B, QA6 B and
A5 B/A6 B cannot be used.
"PARAMETER ERROR" is detected.
Multiple CPU system
Not available for multiple CPU systems.
Availability is checked when parameters are set in GX
Developer.
Instruction
The PR/PRC, UDCNT1/2, PLSY, PWM, SPD,
and PLOADP/PUNLOADP/PSWAPP
instructions are not executable.
An error is detected without executing the instruction.
Instruction
Any instruction of which processing time is
longer than the high speed interrupt interval
cannot be used.
Since interrupt is disabled during instruction execution, high
speed interrupt is not executed at the specified intervals.
Programming unit
No programming unit can be connected.
Response to instruction search slows down.
Or, a communication error may be detected on the
programming unit.
SFC
The following two SFC functions are not
executable.
• SFC transition monitoring check using
SM90 to SM99 and SD90 to SD99
• Periodic execution block function
These functions are ignored without being executed.
Sampling trace
Periodic sampling trace cannot be used.
(Available when each scan or detailed
conditions are set.)
Sampling trace is ignored without being executed.
(Trace results may not be read out when reading trace data.)
Interrupt program
(I0 to I48, I50 to I255),
fixed scan execution
type program
Interrupt programs (I0 to I48 and I50 to I255)
and the fixed scan execution type program
are not executable.
The high speed interrupt cannot be executed at the specified
intervals during execution of an interrupt program or the fixed
scan execution type program because multiple interrupts are
disabled.
Online change
(ladder mode and files)
Online change is not executable.
Since interrupts are disabled while writing a file in the RUN
status, the high speed interrupt cannot be executed at the
specified intervals due to delay of the start, and requires the
following time.
• Up to 102 s for online change (ladder mode)
• Up to 300ms for online change (files)
