Mitsubishi Electric Q12DCCPU-V - Stop Error Detection; Error Display in System Information

12
CONCEPT OF MULTIPLE CPU SYSTEM
12.7 When a CPU Module Stop Error Occurs
12 - 23
9
DEVICE DESCRIPTION
10
MULTIPLE CPU SYSTEM OVERVIEW
11
MULTIPLE CPU SYSTEM CONFIGURATION
12
CONCEPT OF MULTIPLE CPU SYSTEM
13
COMMUNICATIONS BETWEEN CPU MODULES
14
PARAMETERS ADDED FOR MULTIPLE CPU SYSTEMS
15
STARTING A MULTIPLE CPU SYSTEM
16
TROUBLESHOOTING
POINT
When a stop error is detected in a CPU, a multi CPU error (error code: 7000,
MULTI CPU DOWN) occurs in the CPU.
Depending on the timing of error detection, "MULTI CPU DOWN" may be
detected from a CPU that was placed in the "MULTI CPU DOWN" status due to
the first stop error in another CPU.
For example, if a stop error occurred in CPU No.2 and CPU No.3 is halted due to
the error, CPU No.1 may be halted due to the stop error in CPU No.3 depending
on the timing of error detection.
For this reason, CPU No. different from the one for the CPU where the first stop
error occurred may be stored in the common error information area.
To restore the system, remove the cause of the error from the CPU stopped due
to an error other than "MULTI CPU DOWN".
In Figure 12.19, the cause of the CPU No.2 error must be removed since the error
is not "MULTI CPU DOWN".
Figure 12.18 Stop error detection
Figure 12.19 Error display in System information
1 3
2
1 3
2
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.)
1) Stop with "PARAMETER ERROR".
CPU
012 34
Slot number
Control CPU setting
Error other than
MULTI CPU DOWN