Omron SYSMAC CJ - REFERENCE MANUAL 01-2008 Reference Manual page 967

Basic I/O Unit Instructions
Description
928
Area
Counter Area
DM Area
EM Area without bank
EM Area with bank
Indirect DM/EM addresses
in binary
Indirect DM/EM addresses
in BCD
Constants
Data Registers
Index Registers
Indirect addressing using
Index Registers
IORF(097) refreshes the I/O words between St and E, inclusively. IORF(097)
is used to refresh words allocated to Basic I/O Units or Special I/O Units
mounted on the CPU Rack or Expansion Racks. IORF(097) cannot be used to
refresh words in both areas at the same time (i.e., with the same instruction).
Basic I/O Units are allocated words between CIO 0000 and CIO 0999, and
Special I/O Units are allocated words between CIO 2000 and CIO 2959.
When refreshing is specified for words in the Special I/O Unit bit area, all 10
words allocated to the Unit will be refreshed as long as the first word of the 10
words allocated to the Unit is included in the specified range of words.
I/O bit area or
Special I/O Unit bit area
St
E
If words for which there is no Unit mounted exist between St and E, nothing
will be done for those words and only the words allocated to Units will be
refreshed.
Both C200H Special I/O Units and CS Special I/O Units can be refreshed
using the same instruction. (CS Series only)
All of the words allocated to C200H Group-2 High-density I/O Units must be
refreshed at one time. The Unit's I/O words will be refreshed if the first word
allocated to the Unit is in the specified range of I/O words. (The Unit's words
will not be refreshed if the starting word is after the first word allocated to the
Unit, but they will be refreshed even if the end word is before the last word
allocated to the Unit.) (CS Series only)
IORF(097) can be used in interrupt tasks, allowing high-speed response for
the specific I/O words refreshed in the interrupt task. (See Precautions.)
St
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,IR0 to IR15
–2048 to +2047, IR0 to IR15
DR0 to DR15, IR0 to IR15,
IR0 to IR15+(++)
,–(– –) IR0 to IR15
I/O Unit or
Special I/O Unit
I/O refreshing
Section 3-23
E