Mitsubishi Electric MELSEC-Q Series User Manual page 37

(3) RAS function
Function
Slave station cutoff function
Automatic return function
Setting of the data link status upon an error
in the programmable controller CPU of the
master station
Setting of the status of the input data from a
data link faulty station
Slave station refresh/compulsory clear
setting in case of programmable controller
CPU STOP
Standby master function
Master station duplication error canceling
function
(4) Diagnostics function
Function
Line test
Transmission speed test
CC-Link diagnostics
Hardware test
Description
Data link can be continued in a normal station by disconnecting
a slave station that cannot perform data link due to reasons
such as power-off. (No parameter setting is required.)
Using this function prevents the entire system from going down
when one station goes down.
When a slave station that has been disconnected from data link
due to reasons such as power-off returns to the normal status,
data link is automatically restarted. The time between an error
and a return can be shortened.
Whether to stop or continue data link when a stop error occurs
in the CPU module of a master station can be selected.
Whether to clear or hold data input from a data link faulty station
can be selected. How data should be handled can be selected
according to the system used.
Whether to refresh or compulsorily clear remote output (RY)
when the switch on a CPU module is set to STOP can be
selected. How data should be handled can be selected
according to the system used.
If the master station goes down due to an error in a CPU
module, power supply, or others, switching the control to the
standby master station (a backup station for the master station)
continues data link. This function is used not to stop the entire
system even if the master station goes down.
Even if a master station duplication error has been detected, the
error can be cleared without resetting the CPU module or
powering off and on the system.
Description
Whether a CC-Link dedicated cable is properly connected and
data link can be performed with slave stations can be checked.
Whether the transmission speed setting of a slave station is the
same as that of the master station can be checked. The station
number of the slave station having a different transmission
speed setting can be also checked; therefore, corrective actions
upon a transmission error can be easily taken.
The status of a CC-Link system can be checked using a
programming tool. Unlike link special relays (SBs) and link
special registers (SWs), the system status can be checked on a
graphical window; therefore, corrective actions can be easily
taken.
The hardware in the master/local module can be checked.
CHAPTER 3 SPECIFICATIONS
Reference
Page 128, Section 8.2.1
Page 128, Section 8.2.1
Page 130, Section 8.2.2
Page 131, Section 8.2.3
Page 133, Section 8.2.4
Page 135, Section 8.2.5
Page 172, Section 8.3.10
Reference
Page 86, Section 6.5.1
Page 90, Section 6.5.2
Page 311, Section 11.4
Page 324, Section 11.5
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