Omron Programmable Terminals NT631, Operation Manuals

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Troubleshooting
Section 11-1
11-1 Troubleshooting
When a fault relating to the operation of the NT631/NT631C occurs, find the symp-
toms in the table below and respond by following the corresponding “Remedy” in-
dicated in the table.
Notice - Confirm system safety before turning the power ON/OFF or resetting.
- Do not disassemble the PT for repair or modification.
NT631/NT631C
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. (3-1-3 “Power Supply Connection”,
page 39)
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. (8-3
“Screen Display and Notification”, page 469)
the screen.
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. (6-6 “Transmitting the Screen Data”, page 169)
the Support Tool
Not connected to the Support Tool. Check the installation of the connector cable. (3-2
“Connecting to the Support Tool”, page 41)
The PT model setting and direct
connection setting at the Support
Tool do not match the
NT631/NT631C. Using the “PT Configuration” settings of the Support
Tool, set the PT model and direct connection settings
that match the 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
NT631/NT631C. (6-7 “Setting the Conditions for
Communications with the Host by Using the Memory
Switches”, page 172)
message is displayed
when communicating to
the host.
NT631/NT631C and host are not
correctly connected. Check that the type, length, and installation of the
connector cable match the specifications. (Section 4
“Connecting to the Host from the RS-232C Port”, and
Section 5 “Connecting to the Host from the
RS-422A/485 Port”)
In an RS-422A/485 connection, the
terminator setting is incorrect. Make the NT631/NT631C and PC termination
resistance settings correctly. (Section 4 “Connecting
to the Host from the RS-232C Port”, and Section 5
“Connecting to the Host from the RS-422A/485 Port”)
In an NT link (1:N) connection, there
is duplication in the unit numbers. Make the settings again so that there is no duplication.
(6-7-4 “Setting the NT Link (1:N) Method”, page 177)
The power to the NT631/NT631C,
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 by referring to 3-1-4 “Grounding”, page 40.
and the RUN LED is OFF.
The NT631/NT631 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 by referring to 3-1-4 “Grounding”, page 40.
respond.
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.