If two or more converters are connected ················ For the allowable number of connected stations, refer to
the hardware specifications.
DA
DB
DG
SLD
FG
DA
DB
DG
SLD
FG
DA
DB
DG
SLD
FG
Master
Converter
OPC-VG7-CCL
Twisted pair
cables with
shielded
Termination
resistor
Converter
OPC-VG7-CCL
Twisted pair
cables with
shielded
Termination
resistor
9.4.6 Protective operation
Minor failure and serious failure
The CC-Link option has two levels in the failure of the CC-Link option: minor and serious. Upon occurrence of a
failure, the converter issues Er4 "Network Error."
Minor failure and serious failure
Item
Minor failure
(Action upon faulty communication line)
Serious failure
(Action upon faulty option)
Cause of occurrence
• Master shutdown
• Detection of broken wire
• Error in communication data (Noise
intruding to communication cable, etc.)
• Option hardware error
• Option installation fault
Resetting method
After removing the cause of the alarm
(automatically removed upon restoration of
communication), give a reset command (Note
1).
Turn the converter off and remove the
cause of the alarm, then turn the converter
on.
Control of alarm output
• The error is detected only in the CC-Link
operation mode.
• The alarm output method upon detection of
an error can be controlled with function
codes H02 and H03.
Momentary Er4 alarm
Communication error
code
01
02
Action upon minor failure (communication line error)
H02
setting
Upon communication line error
Communication error after H03 time Upon removal of communication error
Operation
state
Indication
Batch failure
output
Operation
state
Indication
Batch failure
output
Operation
state
Indication
Batch failure
output
0
RUN to OFF
Immediate
Er4 ON
Output
←
←
←
Continuation
of stoppage
Continuation
of Er4
Continuation
of output
1
RUN to OFF
Regular
display
No output
OFF
Er4 ON
Output
Continuation
of stoppage
Continuation
of Er4
Continuation
of output
2
RUN to OFF
Regular
display
No output
OFF
Er4 ON
No output
Restart
Regular
display
No output
3
RUN to OFF
Regular
display
No output
←
←
←
Restart
Regular
display
No output
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