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Basic Concepts Section 2-1
Immediate Refreshing by
IORF(097), FIORF(225), or
DLNK(226)
There are three instructions available to immediately refresh the words allo-
cated to different kinds of Units: I/O REFRESH (IORF(097)), SPECIAL I/O
UNIT I/O REFRESH (FIORF(225)), and CPU BUS UNIT I/O REFRESH
(DLNK(226)).
• IORF(097): I/O REFRESH
IORF(097) can immediately refresh a specified range of I/O words in the
CIO Area, or a range of CIO words allocated to Special I/O Units.
• FIORF(225): SPECIAL I/O UNIT I/O REFRESH (See note 2.)
FIORF(225) can immediately refresh the words allocated to a specified
Special I/O Unit. This instruction refreshes the words allocated to the Spe-
cial I/O Unit in both the CIO Area and DM Area.
• DLNK(226): CPU BUS UNIT REFRESH (See note 3.)
DLNK(226) can immediately refresh the words allocated to a specified
CPU Bus Unit. This instruction refreshes the words allocated to the CPU
Bus Unit in both the CIO Area and DM Area.
Note 1. Both IORF(097) and FIORF(225) can immediately refresh the CIO Area
words allocated to a Special I/O Unit, but FIORF(225) has a much faster
instruction execution time. FIORF(225) is also easier to use because the
Unit’s words are specified by its unit number, rather than directly specified
as a range of words.
2. FIORF(225) is supported by CJ1-H-R CPU Units only.
3. DLNK(226) is not supported by the CS1G/H-CPU@@(-V1) and CJ1@-
CPU@@ CPU Units.
Units Refreshed by IORF(097)
Location CPU or Expansion I/O Rack (but not SYSMAC BUS Slave Racks)
Units Basic I/O Units CS/CJ-series Basic I/O Units Refreshed
C200H Basic I/O Units Refreshed
C200H Group-2 High-den-
sity I/O Units
Refreshed
Special I/O Units (allocated CIO words only) Refreshed
CPU Bus Units Not refreshed
IORF
0002
0009
Refresh some or all of
the CIO Area words.
I/O data in
specified range
of words
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