Mitsubishi Electric Q80BD-J71GP21-SX User Manual page 220

APPENDICES
(3) Retry processing for error that occurs during system switching
App
- 3 Appendix 1 Precautions for Accessing Redundant CPU System
POINT
To check which system in the Redundant CPU system is being accessed by the
CC-Link IE Controller Network board, create a program to monitor the following
special relays.
(1) When checking which system is being accessed, System A or System B
System A
SM1511 identification
flag
System B
SM1512 identification
flag
(2) When checking the operation system status
SM1515
Control/
Standby
system
status
SM1516
processing
When the MELSEC data link library is used to access the Redundant CPU during
system switching being processed by the Redundant CPU, a system switching error
(error code: 4248 ), CPU starting error (error code: 4004
H
error (error code: 4245
similar error occurs.
In this case, create a user program that checks the error code and performs retry
processing as necessary.
(a) The following indicates the functions that result in error if executed during system
switching.
MELSEC data link library
• Identifies System A/System B of a redundant system.
• Remains ON/OFF even if the tracking cable is disconnected while the
redundant system is running.
System A System B
SM1511 ON
SM1512 OFF
• Indicates the CPU module operation status
• Remains ON/OFF even if the tracking cable is disconnected while the
redundant system is running.
Control Standby
system system
SM1515 ON
SM1516 OFF
), access destination illegal error (error code: FFDF
H
Functions that result in error by system switching
mdDevSetEx, mdDevRstEx, mdRandREx, mdRandWEx,
mdReceiveEx, mdSendEx,mdControl, mdDevRst, mdDevSet,
mdRandR, mdRandW, mdReceive, mdSend, mdTypeRead
At the time of TRK.CABLE
ERR.(Error code: 6120) occurrence
(System not determined.)
OFF OFF
ON OFF
At the time of TRK.CABLE
ERR.(Error code: 6120) occurrence
(System not determined.)
OFF OFF
ON OFF
), other system CPU module
H
) or
H