Omron CS1W-NC113 - REV 02-2008, Manual

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5-1 Section Transferring and Saving Data
102
Executed
IORD/IOWR
instruction
Data transfer bit CX-Position
Status
IORD IOWR READ
DATA
WRITE
DATA
SAVE
DATA
Upload Download Save
IORD/IOWR
instruction
During
IORD
execution
--- --- --- --- --- --- --- ---
During
IOWR
execution
OK Busy OK OK OK OK Busy Busy
Data
transfer bit
During
read
OK OK Error Error Error OK Busy Busy
a s e b
During
write
OK Busy Error Error Error OK Busy Busy
During
save
Busy Busy Error Error Error OK Busy Busy
CX-Position During
upload
OK OK OK OK OK OK OK OK
During
download
OK Busy Error Error Error OK Busy
(see note)
Busy
(see note)
During
save
Busy Busy Error Error Error OK Busy
(see note)
Busy
(see note)
Note For when more than one CX-Position is used for one PCU.
The above table shows the operation that results when a data transfer function is
executed (the “executed” row in the table) on the data for one axis from the CPU
Unit or CX-Position while a data transfer function is being executed (the “status”
column in the table) on the data for another axis from the CPU Unit or CX-Posi-
tion. (If data transfer functions are executed from the CPU Unit at the same time,
depending on the processing in the PCU, it may be necessary to transpose rows
and columns in the above table to identify the kind of operation that will be per-
formed.)
“---” in the table indicates a combination of functions that does not exist. (The
IORD instruction reads all data in one operation. The status “during IORD
instruction” does not exist.)
“OK” in the above table indicates that the functions will be executed. The second
function will be executed after execution of the first function has been com-
pleted. However, if reading and writing (in whichever order) are performed for
the same data, depending on the timing of the PCU’s internal processing, the
values that are read may either be the values before writing or after writing. (See
the diagram below.)
Explanation