Mitsubishi Electric MELSEC-Q Series User Manual page 101

(4) When the ALM LED on the master module is flashing at one second intervals
Check item
Check that the transmission cables (DP, DN) are not short-
circuited.
Check the wiring of the terminal blocks.
Check that the current consumption of the AnyWireASLINK
system is within the specified range.
(5) When the ALM LED on the master module is on
Check item
Check that the transmission cables (DP, DN) are not
disconnected.
Check the wiring of the terminal blocks.
Perform the automatic address detection.
Check the existence of the slave module.
(6) When the SET LED on the master module is flashing and does not turn off
Check item
Check that Parameter access completion flag (X(n+1)1) is
not off or Automatic address detection flag (X(n+1)4) is not
on.
CHAPTER 10 TROUBLESHOOTING
Action
• Check that the transmission cables (DP, DN) are not short-
circuited.
• When crimping the link connector, check that the pin layout
is correct.
Check that the transmission cables (DP, DN) are not in
contact with each other and that there is no incorrect wiring
in the terminal block wiring of the master module or the slave
module.
Correct the cables (wire diameter, total length) and modules
(type, the number of connected modules) so that the current
consumption of all the slave modules does not exceed the
transmission cable supply current of the master module.
( Page 26, Section 3.2.1, Page 47, Section 6.2.3)
Action
• Check that the transmission cables (DP, DN) are free from
disconnection.
• Check that the cables have been crimped with proper pin
layout using link connectors appropriate to the wire
diameter.
• Check that the transmission cables (DP, DN) and power
cables (24V, 0V) are properly connected to the terminal
block of the master module.
• Check that there is no incorrect wiring and screws are
tightened sufficiently.
When creating a new system, adding or removing a slave
module, or changing the address of the slave module,
perform the automatic address detection.
After performing the automatic address detection, check that
the number of slave modules and the address are consistent
with those of the actual system.
If the LINK LED of the slave module does not flash, check
that there is no disconnection, short circuit, incorrect wiring,
or poor contact in the transmission cables (DP, DN) around
the module.
Action
• Reset the CPU module, or power off and on the system.
• Check that automatic address detection is not performed
while parameter access is in progress.
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