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MELSEC-Q
14 SYSTEM CONFIGURATION OF MULTIPLE PLC SYSTEM
14.2.8 Processing when High Performance model QCPU stop errors occur
The operations for the entire system will differ when a PLC No.1 stop error occurs and
when any of PLC No.2 to No.4 stop error occurs in the multiple PLC system.
(1) When a stop error occurs at the PLC No.1
(a) A "MULTIPLE PLC DOWN (error code: 7000)" error occurs for the CPU
modules for PLC No.2 to No.4 and motion CPUS and the multiple PLC
system will be halted when a stop error occurs at the PLC No.1
(See point on the next page for details)
(b) Observe the following procedures to restore the system.
1) Confirm the cause of the PLC No.1 error with the PC diagnosis
function.
2) Remove the cause of the error.
3) Either reset the PLC No.1 or restart the power to the PLC.
All PLCs on the entire multiple PLC system will be reset and the
system restored when the PLC No.1 is reset or the power to the PLC is
restarted.
(2) When a stop error occurs at the PLC No. other than No.1
Whether the entire system is halted or not is determined by the multiple PLC
setting's "Operating Mode" setting when a stop error occurs in the CPU modules
for PLC No.2 to No.4.
The default setting is for all PLCs to be stopped with a stop error.
When you do not want to stop all PLCs at occurrence of a stop error in any of the
CPU modules, click the check box that corresponds to the PLC No. whose error
will not stop all PLCs. (Arrow D)
D
(a) A "MULTIPLE PLC DOWN (error code: 7000)" error occurs for the CPU
modules and the multiple PLC system will be halted when a stop error is
occurs in CPU modules for which the "All station stop by stop error of PLC
'n' " has been set. (See POINT on the next page for details.)
(b) A "MULTIPLE PLC ERROR (error code: 7010)" error occurs for all other
PLCs but operations will continue when a stop error occurs in CPU
modules for which the " All station stop by stop error of PLC 'n' " has not
been set.
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