Epson EM07ZS1647F User Manual page 102

4. Troubleshooting (DeviceNet)
♦ Causes of Error
90
Possible Cause
Voltage drop of Measure voltage of
communications communications power supply at
power supply the master unit.
→ Normal: 11V or more between
Disconnected (1) Check that terminating
terminating
resistors
Cable (2) Measure resistance between
disconnection
Disconnected
connector
→ Normal: 50 to 70 Ω
Disconnected
signal wire
Loose connector Check for the connection of
Loose signal wire connectors and signal wires.
→ The connectors and signal
All slaves power Measure the power voltage of the
OFF slaves. (It should be within the
range of sufficient voltage for
slave operation.)
Master unit (1) Start
configuration
(2) Check that the configuration
Examination Method
V+ and V-
If the voltage is 11 to 14 V, the
master unit is a possible cause.
Fix the problem on it.
resistors are connected to
both ends of the network.
signal wires with
communications power
supply OFF.
Measuring point: Connection
of the master
For detail, refer to the section
4.1.3.1 Connection Problem.
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.
applicomIO Console
application and check that the
configuration has
difference with the network
condition.
data were written in flash.
For details, refer to the section
4.1.3.6 EPSON RC+ Master
Configuration.
Countermeasure
Check voltage of the power
supply.
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.
Connect the connectors
and signal wires again.
Supply power to the slaves.
Change the configuration.
no
Fieldbus I/O Rev.6