Resetting The Multiple Cpu System - Mitsubishi Electric MELSEC Q Series User Manual

3.9 Resetting the multiple CPU system

The entire multiple CPU system can be reset by resetting CPU No.1.
The CPU modules of No.2 to No.4, I/O modules and intelligent function modules will be reset when CPU No.1 is reset.
If a stop error occurs in any of the CPUs on the multiple CPU system, either reset CPU No.1 or restart the multiple
CPU system (power supply ON
Recovery is not allowed by resetting the error-stopped CPU modules other than CPU No.1.
(Example) For High Performance model QCPU or Process CPU
●
It is not possible to reset the CPU modules of No.2 to No.4 individually in the multiple CPU system.
If an attempt to reset any of those CPU modules during operation of the multiple CPU system, a "MULTI CPU DOWN
(error code: 7000)" error will occur for the other CPUs, and the entire multiple CPU system will be halted.
However, depending on the timing in which any of CPU modules other than No.1 has been reset, an error other than
the "MULTI CPU DOWN" may halt the other CPUs.
●
A "MULTI CPU DOWN (error code: 7000)" error will occur regardless of the operation mode(All stop by stop error of
CPU "n"/continue)station set at the "Multiple CPU settings" screen within the "PLC parameter" dialog box when any of
CPU modules of No.2 to No.4 is reset (
3 - 36
OFF ON) for recovery.
CPU 0 1 2 3 4 5
1 2 3 4 1 1 1 2 3
Resetting is not allowed in the multiple CPU system,
Doing so will result in "MULTI CPU DOWN" in all CPUs
in the multiple CPU system.
The overall multiple CPU system can be reset.
Figure 3.34 Resetting of multiple CPU system
Slot number
6 7
Control CPU setting
3 3 4 4
Section 3.10)