Omron CS1W-213 - REV 02-2008, Operation Manual

Page: 142 / 401

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Transferring and Saving Data Section 5-1
Example:
5-1-6 Data Transfer Priority
As mentioned in 5-1-1 Transferring Data , parameters and data can be trans-
ferred to the PCU using the 3 methods shown below. If these 3 methods are
used in combination, a situation where data transfer is impossible may occur.
The following table indicates the operation of the PCU when data is trans-
ferred using different combinations of the 3 methods.
CPU Unit
Transfer data
Error flag
Error code
Operating
memory area
Transferred using data
transfer bit or IOWR
instruction
I/O refresh
PCU
Data check
Error
Transfer Error Output to CPU Unit
(containing illegal data)
CPU Unit
Error not output
to CPU Unit
Operating
memory area
IOWR instruction
(completed successfully)
I/O refresh
PCU
Data check
Error
Error cleared
Transfer Error Not Output to CPU Unit
Transfer data
(containing illegal data)
Error flag
Error code
Transferred using data
transfer bit or IOWR
instruction