When Operation Error Occurs On The Master Station - Mitsubishi Electric MELSEC iQ-R Series User Manual

When operation error occurs on the master station

Problem Check item
Data link cannot G1-1
be stopped/
restarted.
G1-2
A faulty station G2-1
cannot be
detected.
A station G3-1
becomes faulty at
a certain
transmission
speed.
When multiple G4-1
remote stations
are
simultaneously
powered off at a
speed of
156kbps, the L
RUN LED turns
off temporarily.
4 TROUBLESHOOTING
122
4.5 Troubleshooting by Symptom
Description
Data link stop Is 'Data link stop' (SB0002)
turned on?
Does no error occur?
Data link restart Is 'Data link restart' (SB0000)
turned on?
Does no error occur?
Is the corresponding station
disconnected?
Is the station set as Is the station set as an error
an error invalid invalid station?
station?
Are station Are station numbers unique?
numbers unique?
• Can a faulty • Can a faulty station be
station be identified with 'Data link status
identified with of other stations' (SW0080 to
'Data link status SW0083)?
of other stations' • Are communications normal if
(SW0080 to the transmission speed is
SW0083)? slow such as 156kbps?
• Are
communications
normal if the
transmission
speed is slow
such as
156kbps?
Number of retries Number of retries setting
setting
Check method
• Check the program.
• Check the refresh devices set in
the module parameters.
Check 'Data link stop result'
(SW0045).
• Check the program.
• Check the refresh devices set in
the module parameters.
Check 'Data link restart result'
(SW0041).
• Check cable status visually or
by the line test using the
engineering tool.
• Check the parameters. (Local
station)
• Check the operating status of
the CPU module on the
corresponding station.
Check 'Error invalid station
specification status' (SW0078 to
SW007B).
Check 'Temporary error invalid
status' (SW007C to SW007F).
Check the station number setting.
Check transmission speed of the
faulty station.
Check if the cables are properly
wired.
Check if the cables are grounded
by the shielded part.
Check if terminating resistors are
connected to the both ends in the
CC-Link system.
Check if a station with built-in
terminating resistor is connected
other than at both ends in the CC-
Link system.
Check the number of retries.
Action
• Correctly set the SB area.
• Turn on 'Data link stop'
(SB0002).
Take action according to the error
code.
• Correctly set the SB area.
• Turn on 'Data link restart'
(SB0000).
Take action according to the error
code.
Correct the cables and settings of
the corresponding station, and
start the system.
Cancel the error invalid station
setting.
Cancel the temporary error invalid
station setting.
Correct the station number setting.
Set the same transmission speed
as that set for the master station.
Correct the wiring.
Ground the shielded part.
Connect terminating resistors to
both ends in the CC-Link system.
• Increase the transmission
speed.
• Reduce the number of retries.