Retry Processing For The Error That Occurs During System Switching Processing - Mitsubishi Electric MELSEC SW1DNC-CCIEF-B User Manual

<After system switching>
CC-Link IE Field Network
(Network No.2)
Control system
Station No.3
Standby system
Checking the system to access target
To check which system in the Redundant CPU system is being accessed by the CC-Link IE Field Network board, create a
program to monitor the following special relays.
The flag status does not change even if the tracking cable is disconnected.
• When checking which system is being accessed, System A or System B
Special relay
SM1511 (System A identification flag)
SM1512 (System B identification flag)
• When checking the operation system status
Special relay
SM1515 (Control system judgment
flag)
SM1516 (Standby system judgment
flag)
Retry processing for the error that occurs during system
switching 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: 4248H), CPU starting error (error code: 4004H), other system CPU
module error (error code: 4245H), access destination illegal error (error code: FFDFH) or similar error occurs.
In this case, create a user program that checks the error code and performs retry processing as necessary.
Functions that result in error if executed during system switching
Functions that result in error by system switching
MELSEC data link library
Station No.4
CC-Link IE Field Network module
MELSECNET/H module
Station No.5
MELSECNET/H
(Network No.1)
Tracking cable
Station No.1 Station No.2
System A
ON
OFF
Control system
ON
OFF
mdDevSetEx, mdDevRstEx, mdRandREx, mdRandWEx, mdReceiveEx, mdSendEx, mdControl, mdDevRst,
mdDevSet, mdRandR, mdRandW, mdReceive, mdSend, mdTypeRead
Standby system
Control system
System B
OFF
ON
Standby system
OFF
ON
Appendix 1 Precautions for Accessing Redundant CPU System
At the time of TRK.CABLE
ERR. (Error code: 6120)
occurrence (System not
determined.)
OFF
OFF
At the time of TRK.CABLE
ERR. (Error code: 6120)
occurrence (System not
determined.)
OFF
OFF
APPX
177
A