Mitsubishi MELSEC Q Series User Manual page 24

1 OVERVIEW
Master
station
Station number 1
(occupies 2 stations)
Master
station
Station number 1
Remote station
(occupies 2 stations)
1 - 6
(5) Parameter setting by GX Developer or the dedicated instruction
There are two parameter setting methods; the parameters can either be set by
GX Developer or by using a dedicated instruction (see Sections 2.2.1, 4.2.5 and
4.2.6).
The following table lists the differences between the two setting methods.
Parameter setting with
GX Developer
Parameter setting with
dedicated instruction
(6) System down prevention (Slave station cut-off function)
Because the system employs the bus connection method, even if a module
system fails due to power off, it will not affect the communication with other
normal modules.
Also, for a module using a 2-piece terminal block, the module can be replaced
during data link. (Replace the module after turning off the module power).
However, if the cable is disconnected, data link to all stations are disabled (see
Section 4.3.1).
Station number 3
Remote station
(occupies 1 station)
Faulty
station
Station number 3
(occupies 1 station)
(7) Automatic return function
When a station that has been disconnected from the link due to power off
recovers the normal status, it will join the data link automatically (see Section
4.3.2).
Program
requirement for Automatic
setting
parameters
Not required
Required
Station number 4
Local
station
(occupies
1 station)
Remote station
Data link continues
Station number 4
Local
station
(occupies
1 station)
Remote station
Number of
CPUs that can
refresh
be mounted
4 modules
64 modules
Station number 5
Remote station
(occupies 2 stations)
Station number 5
Remote station
(occupies 2 stations)
MELSEC-Q
Changing the
parameter
settings while
the PLC CPU is
running
Station number 7
Local
station
(occupies
4 stations)
Station number 7
Local
station
occupies
4 stations)
1 - 6