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2 MULTIPLE CPU SYSTEM
2.1.6 Operation for CPU module stop error
The entire system will behaves differently depending whether a stop error occurs in
CPU No.1 or any of CPU No.2 to No.4 in the Multiple CPU system.
(1) When a stop error occurs at CPU No.1
(a) A "MULTI CPU DOWN (error code: 7000)" error occurs at the other CPUs
and the Multiple CPU system will be halted when a stop error occurs at the
PLC CPU No.1.
(Note-1)
(b) The following procedure to restore the system is shown below.
1) Confirm the error cause with the PLC diagnostics on GX Developer.
2) Remove the error cause.
3) Either reset the PLC CPU No.1 or restart the power to the Multiple CPU
system (power ON
OFF ON).
All CPUs on the entire Multiple CPU system will be reset and the system will
be restored when PLC CPU No. 1 is reset or the Multiple CPU system is
reapplied.
(2) When a stop error occurs at CPU other than No.1
Whether the entire system is halted or not is determined by the Multiple CPU
setting's "Operating Mode" setting when a stop error occurs in a PLC CPU
module/Motion CPU module other than CPU No.1.
The default is set for all CPUs to be stopped with a stop error.
When you do not want to stop all CPUs at occurrence of a stop error in a PLC
CPU module/Motion CPU module, remove the check mark that corresponds to
the CPU No. so that its error will not stop all CPUs. (See arrow A.)
A
(a) When a stop error occurs in the CPU module for which "All station stop by
stop error of CPU 'n' " has been set, a "MULTI CPU DOWN (error code:
7000)" error occurs for the other PLC CPU module/Motion CPU modules
and the Multiple CPU system will be halted.
(Note-1)