Troubleshooting Procedures When The "Err." Led Of The Master Station Is Flashing Or When Normal Data Cannot Be Sent/Received During Data Link - Mitsubishi MELSEC Q Series User Manual

13 TROUBLESHOOTING
13.2 Troubleshooting Procedures When the "ERR." LED of the Master Station is Flashing or
When Normal Data cannot be Sent/Received During Data Link
Do the parameter
settings and the installed system
configuration match
properly?
Y
Are the master
station link special registers
SW0080 to SW0083 (other station
data link status)
turned on?
Y
Are the master
station link special registers
SW0098 to SW009B (station
number overlap status)
turned on?
Y
Check the module for which
SW0098 to SW009B are on
Are the
station number
switches set properly?
(Are there any station numbers
that are incompletely
matched? 2)
Y
Corresponding module
malfunction
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N
Revise the parameter settings
or installed system configuration
N
Master station malfunction
N
Check the module for which
SW0080 to SW0083 are on
Is the power on?
N
Set the station number
switches properly
Turn on the power again/
turn on the reset switch
N
Is there a "POWER" LED
on the module?
Is the "POWER" LED lit?
Is the "RD" LED lit?
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1: Check for short-circuits, reversed connection, disconnection, terminal resistors, FG connection, overall distance,
and distance between stations.
N
Turn on the power
Y
Y
N
Y
N
Y
Is the communication
cable wired properly?
1
Y
Corresponding module
malfunction
MELSEC-Q
Check on master station side
Check on slave station side
Is the supplied
N
power within the specified
range?
Y
Set the supplied voltage to
within the specified range
Corresponding module
malfunction
N
Correct the communication
cable wiring
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