Instruction Execution Times And Number Of Steps - Omron SYSMAC CS Series Operation Manual

Instruction Execution Times and Number of Steps

Scheduled Interrupt Tasks
External Interrupt Tasks
Power OFF Interrupt Tasks

10-5 Instruction Execution Times and Number of Steps

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Some I/O interrupts, however, are not executed during interrupt tasks even
if the I/O interrupt conditions are satisfied. Instead, the I/O interrupts are
executed in order of priority after the other interrupt task has completed ex-
ecution and the software interrupt response time (1 ms max.) has elapsed.
The interrupt response time of I/O interrupt tasks is the sum of the Input ON
delay (0.2 ms max.) and the software interrupt response time (1 ms max.).
(Interrupt Input Unit retrieval)
Interrupt task execution
The interrupt response time of scheduled interrupt tasks is the time taken
from after the scheduled time specified by the MSKS(690) instruction has
elapsed until the interrupt task has actually been executed.
The length of the interrupt response time for scheduled interrupt tasks is 1 ms
max.
Note Scheduled interrupt tasks can be executed (while an instruction is being exe-
cuted, or by stopping the execution of an instruction) during execution of the
user program, I/O refresh, peripheral servicing, or overseeing. The interrupt
response time is not affected by the scheduled time elapsing during any of the
above processing operations.
Some scheduled interrupts, however, are not executed during other interrupt
tasks even if the scheduled interrupt conditions are satisfied. Instead, the
scheduled interrupts are executed in order of priority after the other interrupt
task has completed execution and the software interrupt response time (1 ms
max.) has elapsed.
Scheduled interrupt task
The interrupt response time for external interrupt tasks differs depending on
the Unit or Board (Special I/O Unit, CS-series CPU Bus Unit, or Inner Board)
that is requesting the external interrupt task of the CPU Unit and the type of
service requested by the interrupt. For details, refer to the appropriate opera-
tion manual for the Unit or Board being used.
Power OFF interrupt tasks are executed within 0.1 ms of the power being con-
firmed as OFF.
The following table lists the execution times for all instructions that are avail-
able for CS-series PLCs.
Input
Input ON delay
I/O interrupt task inter-
rupt response time
Scheduled interrupt time
Internal timer
Software interrupt response time
Section 10-5
Software interrupt response time