Omron CJ1W-C113 - REV 02-2008, Operation Manual

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120
Transferring and Saving Data Section 5-1
Note For when more than one CX-Position is used for one PCU.
Explanation The above table shows the operation that results when a data transfer func-
tion 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-Position. (If data transfer functions are executed from the CPU Unit
at the same time, depending on the processing in the PCU, it may be neces-
sary to transpose rows and columns in the above table to identify the kind of
operation that will be performed.)
“---” 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 sec-
ond function will be executed after execution of the first function has been
completed. 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 writ-
ing. (See the diagram below.)
IORD/IOWR
instruction
Data transfer bit CX-Position
IORD IOWR READ
DATA
WRITE
DATA
SAVE
DATA
Upload Download Save
IORD/IOWR
instruction During
IORD exe-
cution --- --- --- --- --- --- --- ---
During
IOWR exe-
cution OK Busy OK OK OK OK Busy Busy
Data transfer
bit During
read OK OK Error Error Error OK Busy Busy
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)
Executed
Status