Mitsubishi Electric MELSEC iQ-R-R04CPU - Page 303

16 MULTIPLE CPU SYSTEM FUNCTION
16.4 Data Communication Between CPU Modules
301
16
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"
(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.
(1)
Send area of
CPU No.1
Send area of
CPU No.2
(Receive area of
CPU No.1)
Send area of
CPU No.3
(Receive area of
CPU No.1)
Send area of
CPU No.4
(Receive area of
CPU No.1)
Send area of
CPU No.2
Send area of
CPU No.3
Send area of
CPU No.4
Fixed scan
communication area
Fixed scan
communication area
CPU No.1
(host CPU module)
CPU No.2
(another CPU module)
Setting:
Establish fixed scan
communication.
Setting:
Establish fixed scan
communication.
Setting:
Establish fixed scan
communication.
Setting:
Do not establish fixed scan
communication.
Send area of
CPU No.1
Send area of
CPU No.2
Send area of
CPU No.3
Send area of
CPU No.4
Fixed scan
communication area
CPU No.3
(another CPU module)
Send area of
CPU No.1
Fixed scan
communication area
CPU No.4
(another CPU module)