Epson RC700, Руководство пользователя

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4. Troubleshooting (DeviceNet)
270 RC700 / RC90 Option Fieldbus I/O Rev.14
♦
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-

If the voltage is 11 to 14 V, the
master unit is a possible cause.
Fix the problem on it.
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 Ω

Measuring point: Connection
of the master

For details, 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.

Checkpoint: Between the
master and its slaves

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
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.

For details, refer to the section
4.1.3.6 EPSON RC+ Master
Configuration
.
Change the configuration.