Troubleshooting
12-3
12.3 LED state of this machine
(1) When the
“ALM” LED is lit or is flashing
[1]
“ALM” flashes slowly (one second cycle): DP-DN short-circuit error
Check items
Description of measures
Check that transmission line (DP, DN) is
not short-circuited.
Check that the transmission line (DP, DN) is
not short-circuited.
Check that the pin assignment was correct
when the link connector was crimped.
Check the wiring of the terminal block.
Check that there is no contact of the
transmission line (DP, DN) and no incorrect
wiring of the terminal block in the machine or
the slave unit.
Check that the consumption current of
the AnyWireASLINK system meets the
specification.
Modify cables (wire diameter, total extension)
and slave units (type, number of connections)
so that the consumption current of all slave
units is less than the transmission line supply
current value of the machine.
[2]
“ALM” flashes quickly (0.2 second cycle): Transmission circuit drive voltage drop error
Check items
Description of measures
Check the voltage of the 24 V DC
external supply power.
Make adjustments so that the power voltage of
the 24 V DC external supply power does not
exceed the rating (21.6 to 27.6 V DC).
(Recommended voltage is 26.4 V DC.)
Check that the power line (24 V, 0 V) is
not short-circuited.
Check that the power line (24 V, 0 V) is not
disconnected or short-circuited. Check that the
pin assignment was correct when the link
connector was crimped.
Check the wiring of the terminal block. Check that the 24 V DC external supply power
is properly wired to the machine and the slave
unit terminal block. Also pay attention to short-
circuit, incorrect wiring and insufficient
tightening of the screws.
[3]
“ALM” is lit
:
DP-DN (transmission line) disconnection error
Check items
Description of measures
Check that the transmission line (DP,
DN) is not disconnected.
Check connection parts and continuity between
lines.
Check the wiring of the terminal block. Check that there is no incorrect wiring.
Carry out automatic address
recognition.
ALM lights up at initial continuity.
Carry out automatic address recognition.
