When Operation Of The Master Station Is Faulty - Mitsubishi Electric L26CPU-BT User Manual

15.2.4

When operation of the master station is faulty

(1) Problems on abnormal operation of the master station
Description
Check item
of problem
G1-1 Data link stop
Unable to
stop/restart the
data link
G1-2 Data link restart
Is the station set
to the error
Faulty stations
invalid station?
cannot be G2-1
detected.
Are not station
numbers
overlapping?
Can faulty
stations be
specified at the
communication
status of other
stations
Faulty station
(SW0080 to
occurs at certain
G3-1 SW0083)?
transmission
Can the
speeds.
communication
be made
normally at slow
transmission
speeds, such as
156 kbps?
When multiple
remote stations
are powered off
Retry count
at 156 kbps, the G4-1
setting
"L RUN" LED
goes off
temporarily.
Check contents
Check the program.
Is the data link stop
Check the automatic refresh
(SB0002) turned on?
parameter.
Check the data link stop result
Does any error occur?
(SW0045).
Check the program.
Is the data link restart
Check the automatic refresh
(SB0000) turned on?
parameter.
Check the data link restart
Does any error occur?
result (SW0041).
Check the cable status visually
or by the loop test of GX
Works2.
Check the parameter. (for local
Is the corresponding
stations)
station disconnected?
Check the operation status of
the programmable controller
CPU at the corresponding
station.
Check the error invalid station
status (SW0078 to SW007B).
Is the station set to the
Check the temporary error
error invalid station?
invalid station status (SW007C
to SW007F).
Are not station numbers Check the station number
overlapping? setting.
Check transmission speed of
the faulty station.
Can faulty stations be
Check if the cables are wired
specified at the
correctly.
communication status of
Check if the cable shield is
other stations (SW0080 to
grounded.
SW0083)?
Check if the terminating
Can the communication be
resistor is connected to both
made normally at slow
ends in the CC-Link system.
transmission speeds, such
Check if a station with built-in
as 156 kbps?
terminating resistor is
connected other than at both
ends in the CC-Link system.
Check the number of the retry
Retry count setting
count setting.
CHAPTER 15 TROUBLESHOOTING
Check procedure Corrective action
Set the SB area properly.
Turn on the data link stop
(SB0002).
Take corrective actions
according to the error code.
Set the SB area properly.
Turn on the data link restart
(SB0000).
Take corrective actions
according to the error code.
Review the cable and
setting of the
corresponding station and,
startup properly.
Release the error invalid
station setting.
Release the temporary
error invalid station setting.
Set the station number
properly.
Configure the transmission
speed setting according to
the master station.
Wire the cable properly.
Ground the shield.
Connect the terminating
resistor to the both ends in
the CC-Link system.
Increase the transmission
speed.
Reduce the retry count.
15
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