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4.6 System Operation When a Stop Error Occurs
The multiple CPU system operation differs depending on the CPU module where a stop error has occurred.
(1) When a stop error has occurred in CPU No.1
"MULTI CPU DOWN" (error code: 7000) occurs in all the other CPU modules and the operation of the multiple
CPU system stops.
(2) When a stop error has occurred in a CPU module other than CPU No.1
The operating status of the system (whether to stop the entire system or not) depends on the "Operation Mode"
setting in PLC parameter ("Multiple CPU Setting").
Parameters are set by default so that the operations of all the CPU modules stop.
To continue operations, uncheck the "All station stop by stop error of PLC 'n'" checkbox of the corresponding
CPU module.
(a) When the "All station stop by stop error of CPU 'n'" checkbox is checked
If a stop error occurs in the CPU module for which "All station stop by stop error of PLC 'n'" has been set,
"MULTI CPU DOWN" (error code: 7000) occurs in all the other CPU modules and the operation of the multiple
CPU system stops.
(b) When the "All station stop by stop error of CPU 'n'" checkbox is not checked
If a stop error occurs in the CPU module for which "All station stop by stop error of PLC 'n'" has not been set,
"MULTI EXE. ERROR" (error code: 7020) occurs in all the other CPU modules, but the operation of the multiple
CPU system continues.
However, if a major error occurs in the CPU module 'n', "MULTI CPU DOWN" (error code: 7000) occurs in all
the other CPU modules and the operation of the multiple CPU system stops regardless of the PLC parameter
setting.
Operation Mode
All Station stop by stop error of PLC 'n':
Operations of all the other CPU modules
stop when an error occurs in CPU No. n.
All Station stop by stop error of PLC 'n':
Operations of all the other CPU modules
continue even if an error occurs in CPU No. n.