Mitsubishi MELSEC-Q Series User Manual page 635

13
MULTIPLE CPU SYSTEM CONCEPT
Error other than
MULTI CPU DOWN
POINT
When a stop error occurs, a multi CPU error (error code: 7000, MULTI CPU
DOWN), occurs in the CPU on which the error was detected.
Depending on the timing of error detection, a "MULTI CPU DOWN" error may be
detected in a CPU of "MULTI CPU DOWN" status, not the first CPU on which a
stop error occurs.
For example, if a stop error occurs in CPU No.2 and CPU No.3 is halted due to
the error, CPU No.1 may be halted because of the stop error in CPU No.3
depending on the timing of error detection
CPU
1
Because of this, CPU No. different from the one of initial error CPU may be stored
in the error data's common information area.
To restore the system, remove the error cause in the CPU that is stopped by an
error other than "MULTI CPU DOWN".
In Figure 13.29, the cause of the CPU No.2 error that is not "MULTI CPU DOWN"
is to be removed.
Figure 13.29 Error display by System information
1) Stop with "PARAMETER ERROR".
0 1 2 3 4
2 3 1 2 3
2) Stop due to stop error detection of CPU No. 2.
("MULTI CPU DOWN" occurs.)
3) May stop with stop error detection of CPU No. 3
depending on the error detection timing.
("MULTI CPU DOWN" occurs.)
Figure 13.28 Detection of stop error
13.7 Operation at CPU Module Stop Error
Slot number
Control CPU setting
13
9
10
11
12
13
14
15
16
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