Omron CJ - PROGRAMMING MANUAL 12-2009 Programming Manual page 234

Interrupt Tasks
Special I/O Unit
Read memory area
Special I/O Unit
Write memory area.
PLC Setup
194
Note The leftmost bits of A426 (Interrupt Task Error, Task Number) can be used to
determine which of the above interrupt task errors occurred. (Bit 15: 10 ms or
higher execution error if 0, multiple refresh error if 1)
IORD(222)
Interrupt task
IORD
C
W
D
END
IOWR(223)
Interrupt task
IOWR
C
S
W
END
When using the CX-Programmer, make the settings on the CPU Settings Tab
Page.
Incorrect Use
Cyclic refreshing is enabled
for a Special I/O Unit in the
PLC Setup (the default
setting), and IORD(222) is
executed in an interrupt
task to read that Special I/O
Unit's allocated words.
Incorrect Use
Cyclic refreshing is enabled
for a Special I/O Unit in the
PLC Setup (the default
setting), and IOWR(223) is
executed in an interrupt
task to write that Special I/O
Unit's allocated words.
Section 4-3
Correct Use
Cyclic refreshing is disabled
for a Special I/O Unit in the
PLC Setup, and IORD(222)
is executed in an interrupt
task to read that Special I/O
Unit's allocated words.
Correct Use
Cyclic refreshing is disabled
for a Special I/O Unit in the
PLC Setup, and IOWR(223)
is executed in an interrupt
task to write that Special I/O
Unit's allocated words.