KEYENCE DL-DN1 User Manual

Page 77

5-2 Troubleshooting

5-5

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- DeviceNet Compatible Network Unit DL-DN1 User’s Manual (GT2) -

Sensor communication indicator

This lamp indicates whether the DL-DN1 is communicating properly with sensor
amplifiers.
The cause of the error can be identified by reading the error code through I/O
communication or explicit messaging.

"Error information list" (page 3-8)

LED status

Condition

Corrective action

Not lit

Power is not supplied to the
DL-DN1.

Check that the DL-DN1 is cor-
rectly connected with the sensor
amplifiers.

Green

Solid

Communicating correctly.

Flashing

In process of power-on
reset.

After the power-on reset time
has elapsed, the DL-DN1 auto-
matically switches to the normal
state.

Red

Flashing at
fixed inter-
vals

Temporarily unable to com-
municate with sensor ampli-
fiers.

Check for any noise source
around the DL-DN1. (The error
is automatically corrected after
the cause is removed.)

Repeating
of 4 con-
secutive
flashes

Model error (0003h)

Connect a sensor amplifier of a
compatible model.

Mixed connection error
(0004h)

Remove the incompatible sen-
sor amplifier.

Number-of-units error
(0006h)

Observe the number of connect-
able sensor amplifiers.

Solid

Initialization error
(0001h/0002h/0005h)

Check the number of connected
sensor amplifiers and the con-
nection to the sensor amplifiers,
and then cycle power. If the
error can not be restored, con-
tact your nearest sales office.

Sensor-to-sensor communi-
cation error
(0007h)

Check the connections of the
sensor amplifiers, and then
cycle power.