Mitsubishi Electric QJ71LP21 Reference Manual page 223

8 TROUBLESHOOTING
D
Value 3 : Abnormal
common parameters
Review the common
parameters and station
inherent parameters.
Value 2 : No common
Set the common
parameters.
Check SW4A.
Check the data linking stop
request station and the
designation method.
8 - 16
(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
Is only the
transient transmission
used?
No
(Execute the cyclic transmission)
Check the data link status
of the remote master station
with GX Developer's
network diagnostics.
Are all the
stations executing
data linking
normally?
No
Check the stations that are
not executing data linking.
Check the baton pass status
of the applicable station with
GX Developer's network
monitor.
Is the applicable
No station executing the baton
pass normally?
Yes
Is the applicable
station waiting
for parameter
communication?
(SB54: On?)
No
Did a LINK
PARA ERROR occur
in the remote master
station's CPU?
No error
Value of SW49?
Value 1:
Stop designated
parameters
Value 1 :
Data linking Value of SW47?
stopped
Value 2: Data linking stopped
Check SB00 to 03 and SW00
to 04.
SW47: Host baton pass status
SW48: Cause of host baton pass interruption
SW49: Cause of host data linking stop
SW54: Parameter information
A
Yes
SW55: Parameter setting status
Yes
C
Check with SB70 to 72
and SW70 to 73.
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.
Error
Check that the network
setting and the installation
position of the master
module match.
Conduct PC diagnostics.
Value 4: The
remote I/O module
of the host is faulty.
Check the status of the
remote I/O module of the host.
Value 6:
Communication
stopped
Is the value of
the link monitoring time
No problem
parameter sufficient
for the system?
Problem
Try setting the link monitoring
time to the maximum value.
MELSEC-Q
B
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