User`s manual

App - 2 App - 2
MELSEC
APPENDIX
(2) Retry processing for error that will occur during system switching
processing
Any of the following errors will occur when the MELSEC data link library is used
to access the Redundant CPU during system switching processing.
Examples of errors that will occur in redundant CPU
• A system switching error (Error code 4248
H
)
• CPU starting error (Error code 4004
H
)
• Other system CPU module error (Error code 4245
H
)
• Access destination illegal error (Error code FFDF
H
)
Examples of errors that will occur in CC-Link board or module
• Response timeout (Error code B778h)
• Corresponding station error during sending (Error code B201h)
• Transient target station error (Error code B205h)
When an error has occurred, confirm the error code, and create a user program
for retry processing as necessary.
(a) The following indicates the functions that will result in error if
executed during system switching.
Functions that will result in error by system switching
MELSEC data link library
mdControl,mdDevRst,mdDevSet,mdRandR,mdRandW,
mdReceive,mdSend,mdTypeRead
App