Omron SYSMAC CS/CJ Series User Manual

239
Cycle Time/High-speed Processing Section 6-1
3. Execution of IORF(097) and DLNK(226)
■ IORF(097): I/O REFRESH
IORF(097) can be used to refresh a range of I/O words upon execution of the
instruction. IORF(097) can refresh data allocated to Basic I/O Units and Spe-
cial I/O Units.
The following example shows IORF(097) used to refresh 8 words of I/O data.
When a high-speed response is needed for input and output from a calcula-
tion, use IORF(097) just before and just after the calculation instruction.
Note IORF(097) has a relatively long instruction execution time and that execution
time increases proportionally with the number of words being refreshed, so it
can significantly increase the cycle time. Refer to 10-5 Instruction Execution
Times and Number of Steps in the Operation Manual for more details.
■ DLNK(226): CPU Bus Unit I/O Refresh (CS1-H, CJ1-H, or CJ1M CPU Units
Only)
DLNK(226) is used to refresh data for a CPU Bus Unit of a specified unit num-
ber. The following data is refreshed.
• Words allocated to the Unit in the CIO Area
• Words allocated to the Unit in the DM Area
• Data specific to the Unit (See note.)
Note Data specific to a CPU Bus Unit would include data links for Control-
ler Link Unit or SYSMAC LINK Units, as well as remote I/O for De-
viceNet Units.
Application Example: With a long cycle time, the refresh interval for Controller
Link data links can be very long. This interval can be shortened by executing
DLNK(226) for the Controller Link Unit to increase the frequency of data link
refreshing.
6-1-7 Disabling Special I/O Unit Cyclic Refreshing
Ten words in the Special I/O Unit Area (CIO 2000 to CIO 2959) are allocated
to each Special I/O Unit based on the unit number set on the front of the Unit.
Data is refreshed between this area and the CPU Unit each cycle during I/O
St: Start word
E: End word
The data in all words from St through E are
refreshed when IORF(097) is executed.
St
E
The 7 words from CIO 0010 through CIO 0016
are refreshed when IORF(097) is executed.
0016
DLNK
N
DLNK
#1
N: Unit number of CPU Bus Unit
The instruction on the left would refresh the words
allocated to the Unit in the CIO Area and DM Area, and
data specific to the CPU Bus Unit with unit number 1.
Example:

Omron SYSMAC CS/CJ Series Specifications

General

Brand	Omron
Model	SYSMAC CS/CJ Series
Category	Controller
Language	English