Mitsubishi Electric MELSEC iQ-R Series - Multiple CPU Parameter Checking

23 MULTIPLE CPU SYSTEM FUNCTION
23.3 Multiple CPU Parameter Checking
343
23
23.3 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
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)
: there is setting (if the number immediately next is the same number, it refers to the same parameter) , : there is no
setting
Timing Parameters to check Checking conditions for
CPU No.1
Checking conditions for CPU No.2
and over
At power-on or reset of the
CPU No.1
System parameters (other than fixed scan
communication setting and inter-module
synchronous setting)
Checking is not conducted. Compares with the parameters of the CPU of
the lowest number.
Settings of fixed scan communication 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.
Inter-module synchronization setting 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.
CPU parameters (number of points of
refresh settings)
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.
At operating status change
(STOP to RUN) after
parameter change
 Compares with the parameters of the host CPU module before parameters are
changed.
Item Setting conditions for the CPUs of each number
PLC No.1 PLC No.2 PLC No.3 PLC No.4
With or without the setting for
each parameter
System parameters (other than fixed scan communication
setting and inter-module synchronous setting)
*1
1 5 1 1
Settings of fixed scan communication
*2
2 2 6 
Inter-module synchronization setting
*3
3 3 
CPU parameters (number of points of refresh settings)
*4
4 4 
*1
*3
*2
*4
*3
*4
*1
*2
*1
*2
*1
CPU No.1
System parameter
CPU parameter
CPU No.2
System parameter
CPU parameter
CPU No.3
System parameter
CPU parameter
CPU No.4
System parameter
CPU parameter
Check
Check
Check
Check
A verification
mismatch occurs.
A verification
mismatch occurs.