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6-1
Section
Troubleshooting
410
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.
Caution
Confirm system safety before turning the power ON/OFF or resetting.
Caution
Do not disassemble the PT for repair or modification.
PT Symptoms
Cause
Remedy
Power LED 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.)
Power supply fuse has blown.
Contact your OMRON service center.
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 289)
t e sc ee
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 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 NT31/NT31C or
NT631/NT631C.
Cannot communicate with
the host
Cannot switch from the
system initializing screen.
Communication error
message is displayed
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 is displayed
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
Connecting to the Host from the RS-232C Port in
section 4 or
Connecting to the Host from the
RS-422A/485 Port in section 5 in the Setup
Manual.)
In an RS-422A/485 connection, the
terminator setting is incorrect.
Make the PT and PC termination resistance settings
correctly. (Refer to
Connecting to the Host from the
RS-422A/485 Port in 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 LED 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 OMRON service center.
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 OMRON service center.
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Summary of Contents for NT21 Series
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