Epson EM07ZS1647F User Manual page 107

♦ Causes of Error
Possible Cause
Voltage drop of
communications
power supply
Disconnected
terminating
resistors
Cable
disconnection
Disconnected
connector
Disconnected
signal wire
Loose connector
Loose signal wire
All slaves power
OFF
Master unit
configuration
Fieldbus I/O Rev.6
Examination Method
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
unit is a possible cause. Fix the
problem on the unit.
(1) Check that
resistors are connected to both
ends of the network.
(2) Measure resistance between
signal wires
communications power supply
OFF.
→ Normal: 50 to 70 Ω
Measuring point: Connection of
the master
For detail, refer to the section
4.1.3.1 Connection Problem.
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.
Measure the power voltage of the
slaves.
(It should be within the range of
sufficient voltage for the slave
operation.)
(1) Start applicomIO
application and check that the
configuration
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.
4. Troubleshooting (DeviceNet)
Countermeasure
Check voltage of the power
supply.
terminating Fix the problem.
How to find the trouble
point:
with 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.
Console Change the configuration.
has no
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