Omron CS1W-NC113 - REV 02-2008, Руководство пользователя

Страница: 112 / 350

!
5-1 Section Transferring and Saving Data
100
Example:
DM Area
Position #0
Position #1
Position #2
Position #3
CPU Unit
Receive buffer
(internal memory)
PCU
If each item of data is
within the acceptable
range, it is written to the
position data area.
If there is one or
more item that is
outside the
acceptable range,
all data is
annulled.
Error codes output
Position #0
Position #1
Position #2
Position #3
Position data area
(internal memory)
Position #0
Position #1
Position #2
Position #3
•
If an error is detected by the data check, the correct data should be sent again.
•
If data transfer is completed successfully, the error is cleared.
•
If the data is stored or the instruction to activate is executed without the correct
data being re-sent, the error will be cleared but the data after the error will not
be transmitted. In this situation, an abnormal operation may result.
Caution The Intelligent I/O Write (IOWR) and Intelligent I/O Read (IORD) instructions
transfer all data indiscriminately at execution. For this reason, if the IOWR or
IORD instructions are executed consecutively within the same cycle, an error
occurring at data transfer execution may not be output to the operating memory
area, in the way shown below.