Mitsubishi Electric MELSEC-A Series Manual page 154

4
REPLACEMENT OF THE MELSECNET/10 (PLC TO PLC NETWORK)
Item
Simple dual-structured
network
Using SB/SW as user flag
Automatic return
function
Loopback function
Prevention of station
failure by using
external power
supply
Station detach
function
Transient
transmission
available even if
programmable
controller CPU is in
error
Checking the
transient
transmission
abnormal detection
time
Diagnostic function
*1 Use GX Developer.
*2 Use GX Works2 or GX Developer.
4
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Description
QnA/QnAS series
*1
MELSECNET/10 module MELSECNET/H module
Switches link data refresh target to the standby network
to continue data link when break causes error in regular
network.
Sends desired control data to all stations using user-flag
status (SW01F0 to SW01F3) without using link device.
Returns the station disconnected from data link to the
system when it goes to normal status and restarts data
link.
Keeps normal operation between operable stations by
disconnecting faulty area at error occurrence such as
cable break.
Prevents loopback due to shutdown of programmable
controller.
Keeps normal operation between operable stations
except faulty stations and stations switched off.
Checks the errors for CPU modules of which a stop error
occurs, via network from GX Works2 or GX Developer.
Checks error completion time, abnormal detection
network number and abnormal detection station number
of transient transmission.
Checks line conditions of the network and setting
conditions of the module.
: Compatible, : Partial change required, ×: Incompatible
Compat-
Q series
Precautions for replacement
ibility
*2
For Universal model QCPU, the
simple dual-structured system
×
cannot be configured. Configure
a single network system.
Change UFSET, UFRST and
UFOUT instructions to a
sequence program that uses
the link relay and link register.
Set diagnostic items for station-
to-station test and forward loop/
reverse loop test in GX Works2
or GX Developer network
parameters.