High-Speed Interrupt Function - Omron CJ2 CPU - REV 10-2010 User Manual

10-2-6 High-speed Interrupt Function

High-speed interrupt function improves execution of interrupt tasks under certain restrictions (unit ver-
sion 1.1 or later).
Shortening the Interrupt Overhead Time
Use the following procedures to shorten the overhead time (i.e., interrupt task startup time + Cyclic
task return time) when executing I/O interrupt tasks, external interrupt tasks, or scheduled interrupt
tasks.
Interrupt task type
I/O interrupt tasks and exter-
nal interrupt tasks
Scheduled interrupt task
PLC Setup
When using the CX-Programmer, select the Enable high-speed interrupt function Check Box on the
Timings/Synchronous Tab Page.
CJ2 CPU Unit Software User's Manual
Interrupt overhead time

High-speed interrupt function

enabled
25 µs
(Interrupt task startup time 17 µs
+ Cyclic task return time 8 µs)
21 µs
(Interrupt task startup time 13 µs
+ Cyclic task return time 8 µs)
10 CPU Unit Functions
High-speed interrupt function disabled
(default)
37 µs
(Interrupt task startup time 26 µs + Cyclic
task return time 11 µs)
33 µs
(Interrupt task startup time 22 µs + Cyclic
task return time 11 µs)
10
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