Mitsubishi Electric MELSEC Q Series User Manual page 217

(3) Multiple CPU parameters check
At the time of the multiple CPU system power-on, reset or mode change from STOP to RUN of CPU No.1, or
parameter change, whether the multiple CPU parameters are the same settings for all CPUs or not is checked as
shown in Table6.3 with items marked
(Consistency check between CPU modules).
(a) When all CPUs are the same
The multiple CPU system will be started up.
(b) When all CPUs are not the same
The operations described in Table6.3 will be performed.
In this event, check the multiple CPU parameters, and set all CPUs with the same settings.
To start the multiple CPU system, reset CPU No.1 or turn off and on the multiple CPU system (power
ON OFF ON).
(For the action after CPU No.1 reset, refer to Section 3.9.)
Item
When the multiple CPU system is powered on
When CPU No.1 is reset
When CPU in the
RUN mode exist
• When the RUN/
STOP switch has
When CPUs in the
been changed from
RUN mode do not
STOP to RUN.
exist
• When parameters
are written with the
GX Developer
When a stop error
occurs at CPU No.1
*1: The Universal model QCOU checks consistency of multiple CPU parameters among the CPU modules
A "PARAMETER ERROR (error code: 3015)" will occur in the host CPU if they do not match.
After multiple CPU system parameters unavailable with the Motion CPU are changed for the QCPU or PC CPU module in a
multiple CPU system including a Motion CPU, be sure to reset the QCPU for CPU No.1 or turn off and on the programmable
controller system.
Otherwise the QCPU or PC CPU module checks consistency between CPU modules with multiple CPU system parameters
of the Motion CPU, causing a "PARAMETER ERROR (error code: 3012)."
6 - 5
and in the Necessity of same setting column in Table6.1 and 6.2
Table6.3 List of consistency check between CPUs
CPU No.1
No consistency check between CPU
modules for the multiple CPU parameters
*1
will be run.
• A comparison check will be run on the multiple CPU parameters of RUN-state CPU of
the lowest No.
• A "PARAMETER ERROR (error code: 3012/3015)" will occur in the host CPU if they
do not match.
• A comparison check will be run on the
multiple CPU parameters of stopped
CPU No.2.
• A "PARAMETER ERROR (error code:
3012/3015)" will occur in the host CPU if
they do not match.
----
CPU No.1 to 4
• A comparison check will be run on the
multiple CPU parameters of CPU No.1.
• A "PARAMETER ERROR (error code:
3012/3015)" will occur in the host CPU if
they do not match.
• A comparison check will be run on the
multiple CPU parameters of CPU No.1.
• A "PARAMETER ERROR (error code:
3012/3015)" will occur in the host CPU if
they do not match.
STOP to RUN is not allowed as a "MULTI
CPU DOWN (error code: 7000)" error will
occur in the host CPU.
No consistency check between CPU
modules.