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Epson EM07ZS1647F User Manual

Page 107

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4. Troubleshooting (DeviceNet)

♦ Causes of Error

Possible Cause

Examination Method

Countermeasure

{ Voltage drop of

communications
power supply

Measure voltage of
communications power supply at
the master unit.

→ Normal: 11V or more between

V+ and V-

z If the voltage is 11 to 14 V, the

unit is a possible cause. Fix the
problem on the unit.

Check voltage of the power
supply.

{ Disconnected

terminating
resistors

{ Cable

disconnection

{ Disconnected

connector

{ Disconnected

signal wire

(1)

Check that terminating
resistors are connected to both
ends of the network.

(2) Measure resistance between

signal wires with
communications power supply
OFF.

→ Normal: 50 to 70

z Measuring point: Connection of

the master

z For detail, refer to the section

4.1.3.1 Connection Problem.

Fix the problem.

How to find the trouble
point:

Remove the terminating
resistor on one end of the
network. The trouble point
is where resistance changes
from 120

Ω.

{ Loose connector
{ Loose signal wire

Check for the connection of
connectors and signal wires.
→ The connectors and signal

wires should be firmly
connected.

z Checkpoint: Between the master

and its slaves

z For details, refer to the section

4.1.3.2 Loose Connector and
Signal Wire
.

Connect the connectors and
signal wires again.

{ All slaves power

OFF

Measure the power voltage of the
slaves.
(It should be within the range of
sufficient voltage for the slave
operation.)

Supply power to the slaves.

{ Master unit

configuration

(1)

Start applicomIO Console
application and check that the
configuration has no
difference with the network
condition.

(2) Check that the configuration

data were written in flash.

z For details, refer to the section

4.1.3.6 EPSON RC+ Master
Configuration
.

Change the configuration.

Fieldbus I/O Rev.6

95