Multiple Cpu Parameter Checking - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

16.3

Multiple CPU Parameter Checking

Whether the same setting is configured for between the system parameter of each CPU module and multiple CPU refresh
number of points of CPU parameter is checked by the multiple CPU system at the timing shown below. However, as for the
fixed scan communication setting and inter-module synchronization setting, checking is done only for the module using the
functions.
• At power-on
• At reset of the CPU No.1
• At operating status change (STOP to RUN) after parameter change
Timing
At power-on or reset of the CPU No.1
At operating status change (STOP to
RUN) after parameter change
Ex.
An error occurs in the module of each CPU No 2 and 3, and the module of each CPU No 1 and 4 starts up normally when
parameter checking. (Operation in error)
CPU No.1
System parameter
*1
*2
*3
CPU parameter
*4
: there is setting (if the number immediately next is the same number, it refers to the same parameter) , : there is no
setting
Item
With or without the setting for
each parameter
16 MULTIPLE CPU SYSTEM FUNCTION
296
16.3 Multiple CPU Parameter Checking
Parameters to check
System parameters (other than fixed
scan communication setting and
inter-module synchronous setting)
Settings of fixed scan communication
Inter-module synchronization setting
CPU parameters (number of points of
refresh settings)

A verification
CPU No.2
mismatch occurs.
System parameter
Check
*1
Check *2
Check *3
CPU parameter
Check *4
System parameters (other than fixed scan communication
setting and inter-module synchronous setting)
Settings of fixed scan communication
Inter-module synchronization setting
CPU parameters (number of points of refresh settings)
Checking conditions for CPU
No.1
Checking is not conducted.
Checking is not conducted by the CPU module of the number for which the
fixed scan communication setting is not configured. The CPU module of the
number for which the fixed scan communication setting is configured will
compare the parameters with those of the CPU of the lowest number.
Checking is not conducted by the CPU module of the number for which the
Inter-module synchronization setting is not configured. The CPU module of
the number for which the Inter-module synchronization setting is configured
will compare the parameters with those of the CPU of the lowest number.
Checking is not conducted by the CPU module of the number for which the
fixed scan communication setting is not configured. The CPU module of the
number for which the fixed scan communication setting is configured will
compare the parameters with those of the CPU of the lowest number.
Compares with the parameters of the host CPU module before parameters
are changed.
CPU No.3
System parameter
*1
*2
A verification
mismatch occurs.
CPU parameter
Setting conditions for the CPUs of each number
PLC No. 1
1
*1
*2
2
*3
3
*4
4
Checking conditions for CPU
No.2 and over
Compares with the parameters of the
CPU of the lowest number.
CPU No.4
System parameter
*1
CPU parameter
PLC No. 2 PLC No. 3 PLC No. 4
5 1 1
2 6 
3  
4  