14 - 16 14 - 16
MELSEC-Q
14 SYSTEM CONFIGURATION OF MULTIPLE PLC SYSTEM
(3) Multiple PLC setting and I/O Assignment checks
Checks, as shown in table 14.4, will be run to ascertain that all CPU modules
have the same settings (sameness check) when the description column in table
14.3 has been set with the "O" symbol and the power to the sequence is
switched on, the High Performance model QCPU is reset, or the status is
changed from STOP to RUN.
(a) The multiple PLC system will be started up if all PLCs have the same
settings.
(b) The operations described in table 14.4 will be performed when all PLCs do
not have the same settings.
In this event, check the multiple PLC settings and I/O Assignment, and set
all PLCs with the same settings.
To start the multiple PLC system, reset the High Performance model QCPU
for PLC No.1 or turn off and on the PLC (power ON
OFF ON).
(For the action after the High Performance model QCPU for PLC No.1 is
reset, see Section 14.2.7.)
Table 14.4. List of sameness check contents
Item
PLC No.1
PLC No.1 to 4
When the power to the PLC is switched on
When PLC No.1 is reset
No sameness check will be run
• A comparison check will be run on the
multiple PLC settings and I/O
Assignments for PLC No.1.
• A "PARAMETER ERROR (error code:
3012)" will occur in the host PLC if they
do not match.
When PLCs in the
RUN mode exist
• A comparison check will be run on the multiple PLC settings and I/O Assignments for
the PLC in the RUN mode with the lowest number.
• A "PARAMETER ERROR (error code: 3012)" will occur in the host PLC if they do not
match.
When PLCs in the
RUN mode do not
exist
• A comparison check will be run on the
multiple PLC settings and I/O
Assignments for PLC No.2.
• A "PARAMETER ERROR (error code:
3012)" will occur in the host PLC if they
do not match.
• A comparison check will be run on the
multiple PLC settings and I/O
Assignments for PLC No.1.
• A "PARAMETER ERROR (error code:
3012)" will occur in the host PLC if they
do not match.
• When the RUN/STOP
switch has been changed
from STOP to RUN.
• When parameters are
written with the GX
Developer
When a stop error
occurs at PLC No.1
—
STOP
RUN is not allowed as a
"MULTIPLE PLC DOWN (error code:
7000)" error will occur in the host PLC.
POINT
After multiple PLC system parameters unavailable with the Motion CPU are
changed for the High Performance model QCPU or PC CPU module in a multiple
PLC system including a Motion CPU, be sure to reset the High Performance model
QCPU for PLC No.1 or turn off and on the PLC. (Otherwise the High Performance
model QCPU or PC CPU module checks consistency with multiple PLC system
parameters of the Motion CPU, causing a "PARAMETER ERROR (error code:
3012)."
Содержание QCPU (Q Mode)
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