241
Cycle Time/High-speed Processing Section 6-1
Note 1. Longer cycle times (e.g., 100 ms) will increase the interval between when
data links are refreshed. DLNK(226) can be used in this case, as shown in
the following example.
Note If DLNK(226) is executed for a CPU Bus Unit that is busy refreshing
data, data will not be refreshed and the Equals Flag will turn OFF.
Normally, the Equals Flag should be programmed as shown below to
be sure that refreshing has been completed normally.
2. IORF(097) is used to refresh data for Basic I/O Units and Special I/O Units.
DLNK(226) is used to refresh CPU Bus Units (CIO and DM Area words al-
located to the Units and special data for the Units).
END
DLNK
M
DLNK
N
Data links (Controller Link or
SYSMAC Link) are refreshed here for
the CPU Bus Unit with unit number N.
(See note.)
I/O refresh
Peripheral
servicing
Cyclic task n
Data links (Controller Link or
SYSMAC Link) are refreshed here for
the CPU Bus Unit with unit number M.
(See note.)
Data links are all refreshed here for
Controller Link and SYSMAC Link.
DLNK
&0
Execution condition
= Flag
Bit “a”
Refreshes data for the CPU
Bus Unit with unit number 0.
Turns ON bit “a” if data
refreshing fails, enabling the
problem to be detected.
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