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Interrupt Response Time for Scheduled Interrupt Tasks
The interrupt response time for scheduled interrupt tasks is the time taken from after the scheduled
time specified by the MSKS instruction has elapsed until the interrupt task has actually been exe-
cuted.
The length of the interrupt response time for scheduled interrupt tasks is 0.1 ms max.
There is also an error of 10 µs in the time to the first scheduled interrupt (1.0 ms min.).
Note Scheduled interrupt tasks can be executed during execution of the ladder program (even while an instruction
is being executed by stopping the execution of an instruction), I/O refresh, peripheral servicing, or overseeing.
The processing operation in which the scheduled interrupt occurs does not affect the interrupt processing
time.
Scheduled interrupts, however, are not executed during execution of other interrupt tasks even if the interrupt
conditions are satisfied. Instead, the interrupts are executed in order of priority after the current interrupt task
has completed execution and the software interrupt response time has elapsed.As a guideline, the wait time
will be 0 to 3ms.
Internal timer:
Scheduled
interrupt task:
Precautions for Correct Use
Precautions for Correct Use
The scheduled task will not be executed while the CPU Unit suspends operation for online editing.
A-3-3
Serial PLC Link Response Performance
The response times for CPU Units connected via a Serial PLC Link (polling unit to polled unit or polled
unit to polling unit) can be calculated as shown below.
Note A PT cannot be used in the Serial PLC Link.
• Maximum I/O response time (not including hardware delay) =
Polling unit cycle time + Communications cycle time + Polled unit cycle time + 4 ms
• Minimum I/O response time (not including hardware delay) =
Polled unit communications time + 0.8 ms
Number of participat-
ing polled unit nodes
Number of non-
participating polled
unit nodes
Communications cycle
time (ms)
Polled unit
communications
time (ms)
CP1E CPU Unit Software User's Manual(W480)
Scheduled interrupt time
Software interrupt response time
The number of polled units to which links have been established within the
maximum unit number set in the polling unit.
The number of polled units not participating in the links within the maximum unit
number set in the polling unit.
Polled unit communications time × Number of participating polled unit nodes +
10 × Number of non-participating polled unit nodes + 20 × Number of polled unit
nodes
• Communications time set to Standard:
0.4 + 0.286 × [(No. of polled units + 1) × No. of link words × 2 + 12]
• Communications time set to Fast:
0.4 + 0.0955 × [(No. of polled units + 1) × No. of link words × 2 + 12]
Appendices
A-83
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