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APPENDICES
A
Appendix 1 Parameters for a Multiple CPU System
(3) Checking the multiple
In a multiple CPU system, whether the same multiple CPU parameters are set to all the CPU modules is checked
at the following timing.
• When a multiple CPU system is powered on
• When CPU No.1 is reset
• When the operating status of the CPU modules are switched from STOP to RUN
• When any parameter is changed
This check is called a consistency check. (For the parameters to be checked, refer to the items marked and
in the Consistency column on Page 172, Appendix 1.1. For check details, refer to Page 171, Appendix 1 (3) (b).)
(a) When same parameters are set to all the CPU modules
The multiple CPU system starts up.
(b) When same parameters are not set to all the CPU modules
The multiple CPU system performs either of the operations described in the following table.
Check the multiple CPU parameters, and set the same parameters to all the CPU modules in the system. To
start the system, reset CPU No.1 or power off and on the system. ( Page 102, Section 4.6)
*1 Universal model QCPUs perform consistency check. "PARAMETER ERROR" (error code: 3015) will occur in the CPU
module if the parameters do not match.
*2 Universal model QCPUs compare its parameters with those of CPU No.1.
In a multiple CPU system containing a Motion CPU, if multiple CPU parameters not available for Motion CPUs are changed
for a QCPU or PC CPU module, reset the QCPU used as CPU No.1 or power off and on the programmable controller
system.
A High Performance model QCPU, Process CPU, or PC CPU module performs consistency check with the multiple CPU
parameters of the Motion CPU, and detects "PARAMETER ERROR" (error code: 3015).
Item CPU No.1 Other than CPU No.1
The multiple CPU system is powered on.
No consistency check of the multiple CPU
parameters is performed.
*1
• The CPU module compares its
parameters with those of CPU No.1.
• "PARAMETER ERROR" (error code:
3012/3015) will occur in the CPU module
if the parameters do not match with those
of CPU No.1.
CPU No.1 is reset.
• The RUN/STOP
switch is switched
from STOP to RUN.
• Parameters are
written from a
programming tool.
The operating status
of any CPU module is
in RUN.
• The CPU module compares its parameters with those of a running CPU module with
the lowest No.
*2
• "PARAMETER ERROR" (error code: 3012/3015) will occur in the CPU module if the
parameters do not match.
There is no CPU
module whose
operating status is in
RUN.
• The CPU module compares its
parameters with those of CPU No.2 (in
the STOP status).
*2
• "PARAMETER ERROR" (error code:
3012/3015) will occur in the CPU module
if the parameters do not match with those
of CPU No.2.
• The CPU module compares its
parameters with those of CPU No.1.
• "PARAMETER ERROR" (error code:
3012/3015) will occur in the CPU module
if the parameters do not match with those
of CPU No.1.
A stop error has
occurred in CPU
No.1.
-
Since "MULTI CPU DOWN" (error code:
7000) error occurs in the CPU module, the
module will not start running. (No
consistency check is performed.)