6-1SectionTroubleshooting
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6-1 Troubleshooting
When a fault relating to the operation of the PT occurs, find the symptoms in the
table below and respond by following the corresponding Remedy indicated in
the table.
PT Symptoms Cause Remedy
NT31/NT31C or
NT631/NT631C:
Power indicator fails to
come ON
Power is not being supplied. Check the connections and make sure that power is
supplied correctly. (Refer to Power Supply
Connection in section 3 in the Setup Manual.)
NT21:
Nothing is displayed on
the screen.
Power supply fuse has blown. Contact your nearest OMRON representative.
Nothing is displayed on
the screen.
Screen No. 0 has been read at the
host side.
This is not an error. Change the screen number.
(3-3 Screen Display and Notification, page 299)
The system startup waiting time has
not elapsed yet.
This is not an error. The display will appear after the
waiting time has elapsed.
Cannot communicate with
the Support Tool
The Transmit mode has not been
established.
Display the System Menu and select the Transmit
mode. (Refer to Transmitting the Screen Data in
section 6 in the Setup Manual.)
Not connected to the Support Tool. Check the installation of the connector cable. (Refer
to Connecting to the Support Tool in section 3 in the
Setup Manual.)
The PT model setting and direct
connection setting at the Support
Tool do not match the NT21,
NT31/NT31C, or NT631/NT631C.
Using the PT Configuration settings of the Support
Tool, set the PT model and direct connection
settings that match the NT21, NT31/NT31C, or
NT631/NT631C.
Cannot communicate with
the host
Cannot switch from the
system initializing screen.
Communication error
Memory switch settings do not
match.
Check the communication setting in the Memory
Switch menu of the Maintenance mode, and match
the communication protocol settings for the host and
PT. (Refer to Setting the Conditions for
Communications with the Host by Using the
Memory Switches in section 6 in the Setup Manual.)
message
when communicating to
the host.
PT and host are not correctly
connected.
Check that the type, length, and installation of the
connector cable match the specifications. (Refer to
section 4 and section 5 in the Setup Manual.)
In an RS-422A/485 connection, the
terminator setting is incorrect.
Set the terminating resistance correctly for the PTs,
PCs, and RS-232C/RS-422A Adapters. Section 5 in
the Setup Manual.)
In an NT link (1:N) connection, there
is duplication in the unit numbers.
Make the settings again so that there is no
duplication. (Refer to Setting the NT Link (1:N)
Method in section 6 in the Setup Manual.)
The power to the PT, NT-AL001 or
host is OFF.
Check the power supply.
The buzzer has sounded
and the RUN indicator is
OFF.
Malfunction due to external noise Carry out grounding work in accordance with the
conditions. (Refer to Grounding in section 3 in the
Setup Manual.)
The PT has developed trouble. Contact your nearest OMRON representative.
The touch panel does not
respond.
Malfunction due to external noise Carry out grounding work in accordance with the
conditions. (Refer to Grounding in section 3 in the
Setup Manual.)
The touch panel is broken. Test the touch panel with I/O Check in the
MAINTENANCE MODE menu. If there is an error,
contact your nearest OMRON representative.
The PC mode has
changed to MONITOR
mode.
The PT changes the mode when
host link communication is used.
This is an PT specification. When using a PC that
can also be connected using the NT link method,
use an NT link connection (there is no mode change
with the NT link method).
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