Omron CS1W-213 - REV 02-2008, Руководство по эксплуатации

Страница: 141 / 401

116
Transferring and Saving Data Section 5-1
Example:
• 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 mem-
ory area, in the way shown below.
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