Mitsubishi Electric MELSEC iQ-R Series User Manual page 350

When there exists a CPU module for which "Disable" is set to "Fixed Scan Communication Function", if the
send area of the fixed scan communication area is set to a CPU module for which "Disable" is set to "Fixed
Scan Communication Function" (unspecified) in the parameter setting on the host CPU module, no error is
generated because the unspecified CPU module is considered as a reserved one for future configuration.
Example: in four module configuration with the host CPU module is set to CPU No.1 and the fixed scan
communication function of CPU No.4 set to "Disable"
Setting:
Establish fixed scan
communication.
Fixed scan
communication area
CPU No.1
(host CPU module)
(Receive area of
(Receive area of
(Receive area of
(1) Since the setting does not allow fixed scan communication, this CPU module does not send data to the
other CPU modules although send areas have been reserved. This CPU module does not receive data from
the other CPU modules.
23 MULTIPLE CPU SYSTEM FUNCTION
348
23.4 Data Communication Between CPU Modules
Setting:
Establish fixed scan
communication.
Fixed scan
communication area
CPU No.2
(another CPU module)
Send area of
CPU No.1
Send area of
Send area of
CPU No.2
CPU No.1)
Send area of
CPU No.3
Send area of
CPU No.1)
Send area of
CPU No.4
Send area of
CPU No.1)
Setting:
Establish fixed scan
communication.
Fixed scan
communication area
CPU No.3
(another CPU module)
Send area of
Send area of
CPU No.1
Send area of
CPU No.2
Send area of
CPU No.3
Send area of
CPU No.4
Setting:
Do not establish fixed scan
communication.
Fixed scan
communication area
CPU No.4
(another CPU module)
CPU No.1
CPU No.2
CPU No.3
CPU No.4
(1)