Mitsubishi QJ71LP21 - Page 227

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MELSEC-Q
8 TROUBLESHOOTING
(2) From monitoring the network status to troubleshooting of a faulty
station
The following flowchart illustrates the procedure for monitoring the status of the
entire network, detecting a faulty station, and then performing troubleshooting for
the applicable station.
The status of the entire network is monitored with GX Developer.
Start troubleshooting
Check the data link status
of the remote master station
with GX Developer's
network diagnostics.
No
(Execute the cyclic transmission)
Yes
No
A
Yes
Check the stations that are
not executing data linking.
Check the baton pass status
of the applicable station with
GX Developer's network
monitor.
Did a LINK
PARA ERROR occur
in the remote master
station's CPU?
No
Is the applicable
station waiting
for parameter
communication?
(SB54: On?)
No error
Value of SW49?
Is the applicable
station executing the baton
pass normally?
Yes
Check that the network
setting and the installation
position of the master
module match.
Conduct PC diagnostics.
Error
Value 4: The
remote I/O module
of the host is faulty.
Check the status of the
remote I/O module of the host.
Is the value of
the link monitoring time
parameter sufficient
for the system?
Value of SW47?
Value 2: Data linking stopped
Problem
Check SB00 to 03 and SW00
to 04.
Try setting the link monitoring
time to the maximum value.
Value 1 :
Data linking
stopped
Check SW4A.
Check the data linking stop
request station and the
designation method.
No
Check with SB70 to 72
and SW70 to 73.
Review the common
parameters and station
inherent parameters.
Value 2 : No common
parameters
Value 3 : Abnormal
common parameters
Set the common
parameters.
Is only the
transient transmission
used?
B
SW47: Host baton pass status
SW48: Cause of host baton pass interruption
SW49: Cause of host data linking stop
SW54: Parameter information
SW55: Parameter setting status
C
D
Yes
Reexamine the remote
master station network type.
Use GX Developer system
monitor to check whether or
not the function version of the
master module is Version B.
Are all the
stations executing
data linking
normally?
Value 1:
Stop designated
Value 6:
Communication
stopped
No problem