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)

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