Mitsubishi Electric Q12DCCPU-V - When a CPU Module Stop Error Occurs; When a Stop Error Occurs in CPU No.1; When a Stop Error Occurs in Other than CPU No.1; Operation Setting for Stop Error

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12.7 When a CPU Module Stop Error Occurs
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CONCEPT OF MULTIPLE CPU SYSTEM
12.7 When a CPU Module Stop Error Occurs
The behavior of a multiple CPU system depends on whether a stop error occurs in CPU
No.1 or in any of CPU No.2 to No.4.
(1) When a stop error occurs in CPU No.1
If a stop error occurs in CPU No.1, the multi CPU error (error code: 7000, MULTI CPU
DOWN) occurs in all of the other CPU modules, and the multiple CPU system stops.
(2) When a stop error occurs in other than CPU No.1
If a stop error occurs in other than CPU No.1, whether to stop the entire system or not
depends on the "Operation mode" setting in the <<Multiple CPU settings>> tab of C
Controller setting utility.
By default, all CPUs are set to be stopped in the event of a stop error.
In order not to stop all CPUs upon a stop error in a specific CPU module, remove the
check mark of the relevant "All CPUs stopped due to an error in CPU n" box.
(a) When "All CPUs stopped due to an error in CPU n" is selected
If a stop error occurs in the CPU module corresponding to "All CPUs stopped due
to an error in CPU n", a stop error or multi CPU error (error code: 7000, MULTI
CPU DOWN) is detected in all of the other CPU modules, and the multiple CPU
system stops.
(b) When "All CPUs stopped due to an error in CPU n" is deselected
If a stop error occurs in the CPU module corresponding to "All CPUs stopped due
to an error in CPU n", a continue error or multi CPU error (error code: 7020,
MULTI CPU ERROR) occurs in all of the other CPU modules, and the operation of
the system continues.
In addition, if CPU No.n stops due to moderate error or lower, the other CPU
modules continue the operation. However, if any critical error occurs in CPU No.n,
the parameters are not valid, and all CPUs stop.
Figure 12.17 Operation setting for stop error
Operation mode
All CPUs stopped due to an error in CPU n:
"All CPUs stopped due to an error in CPU n" has been set
All CPUs stopped due to an error in CPU n:
"No CPUs stopped due to an error in CPU n" has been set