Omron CRT1 - 10-2009, Operation Manual

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582
Troubleshooting
Section 12-2
Cannot Participate in Network
12-2-2 Troubleshooting by Slave Unit Type
Problem Cause and possible corrections
NS indicator remains
not lit and status does
not change. • Check that all Slave Unit connectors are connected correctly.
• Check that the Master Unit is operating correctly. If using an OMRON Master Unit, check the
Master Unit mode and the Slave Unit node addresses.
• If using a Master from another manufacturer, refer to the user's manual for that Master.
• Check that the communications cable is wired correctly.
• Check that the power supply cable and power supply are wired correctly and that the set-
tings are correct.
• Check connector wiring to make sure that the communications cable and power supply
cables are not disconnected.
NS indicator remains lit
green and status does
not change. Check the following items and take corrective measures based on the Master Unit indicator
display.
• Check that the Master Unit is operating correctly. Refer to the manual for the Master Unit.
• Check that the Slave Unit is registered in the Master Unit registration table.
• Re-register the registration table.
• Check that the Slave Unit I/O area is not outside the area permitted by the Master Unit.
Change the node address if the I/O area is outside the permitted area.
Model Problem Cause Possible correction
All Slave Units The MS and NS indicators do
not light green. Refer to 4-1-3 Communica-
tions Indicators.
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The Network Power Voltage
Drop Flag does not turn ON
even if the network power sup-
ply voltage drops. The monitor value for the net-
work power supply voltage is
set too low.
Note The default setting is
14 V or less.
Increase the network power
voltage monitor value.
The Network Power Voltage
Drop Status is ON even though
the network power supply volt-
age is appropriate. The monitor value for the net-
work power supply voltage is
set too high. Decrease the network power
voltage monitor value.
Cannot set the network power
voltage monitor value. The attempted setting is out-
side the setting range (14 to
26.4 V). Set the voltage within the 14 to
26.4-V range.
Cannot set the name of a con-
nected device or Unit. The name (comment) exceeds
32 characters. Set a name within 32 charac-
ters.
The status for Unit Mainte-
nance Date and Connected
Device Maintenance Date do
not turn ON. The status flag will be OFF
regardless if the monitor value
is set to 0 (function not exe-
cuted). Set the monitor value to a
value other than 0.
When the Unit power was
turned ON again, the following
values did not change to the
ones immediately after the
power was turned OFF. Word
Slave Units: Unit Conduction
Time and Maintenance
Counter The Maintenance Counter
value is stored in internal
EEPROM memory every 12
minutes while the power is ON.
Execute
Save Maintenance
Counter to save the value. If
the power is turned OFF with-
out executing saving the main-
tenance counter, the value
saved previously (from up to
12 minutes earlier) will be
read.
Execute Save Maintenance
Counter in the Maintenance
Information Window of the CX-
Integrator before turning OFF
the power.