Data Transfer Priority - Omron CS1W-NC113 Manual

Transferring and Saving Data

5-1-6 Data Transfer Priority

Example:
Transfer Error Output to CPU Unit
CPU Unit
Transfer data
(containing illegal data)
Error flag
Operating
memory area
Error code
Transfer Error Not Output to CPU Unit
CPU Unit
Transfer data
(containing illegal data)
Error not output
to CPU Unit
Error flag
Operating
memory area
Error code
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 fol-
lowing table indicates the operation of the PCU when data is transferred using
different combinations of the 3 methods.
Transferred using data
transfer bit or IOWR
instruction
I/O refresh
Transferred using data
transfer bit or IOWR
instruction
IOWR instruction
(completed successfully)
I/O refresh
Section 5-1
PCU
Data check
Error
PCU
Data check
Error
Error cleared
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