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13.
Troubleshooting
How to handle UR-DS4AD/UR-DS4DA when it does not work properly or when problems occur.
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Common for UR-DS4AD/UR-DS4DA
Symptom
Checkpoints and countermeasures
POWER LED does not light up
Check that voltage is applied to the Unit power’s 24 V and 0 V and the
I/O power’s L+ and M.
Check that the power terminal block is fully inserted, and the wiring is
correct.
IO-Link communication is not working
COM LED remains lit
Check that voltage is applied to the Unit power’s 24 V and 0 V and the
I/O power’s L+ and M.
Check that the IO-Link Master communication signal (C/Q) and UR-
DS4AD/UR-DS4DA’s C/Q terminal are connected and that the power
terminal block is fully inserted.
Check that the IO-Link Master setting is in IO-Link communication mode.
(For IO-Link Master UR series, check the master parameter "M10. I/O
function setting")
COM LED is flashing at 0.1-second
intervals
IO-Link communication has broken off.
Check the wiring between the IO-Link Master and C/Q.
Check that the other IO-Link communication line (C/Q) and UR-
DS4AD/UR-DS4DA’s C/Q line are not wired closely for several
meters or more.
Check that the power line (inverter or servo motor drive output line) is
not wired closely for several meters or more.
Check that the IO-Link master’s power (24 V, 0 V) wiring is not
separate from UR-DS4AD/UR-DS4DA’s 24 V and 0 V. Be sure to
connect at least the 0 V for both securely.
Check that the IO-Link communication line (C/Q) length has not
exceeded 20 m.
Range switching is not possible with
process output data
Is the setting value (input range) set to specify the range by setting
value? Check that you have not specified anything other than "0" in
the index number 74 of the service data.
ERROR LED is lit
Is the IO-Link communication once established blocked?
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