Troubleshooting - Omron Programmable Terminals NT31 NT31C Setup Manual

Troubleshooting

7-1

Troubleshooting

NT31/NT31C Symptoms
Power LED fails to come
ON
Nothing is displayed on
the screen.
Cannot communicate with
the Support Tool S pp
Cannot communicate with
the host
Cannot switch from the
system initializing screen.
Communication error
message is displayed message is displayed
when communicating to
the host.
The buzzer has sounded
and the RUN LED is OFF. U O
The touch panel does not
respond. p
The PC mode has
changed to the monitor
mode.
232
When a fault relating to the operation of the NT31/NT31C occurs, find the symp-
toms in the table below and respond by following the corresponding Remedy in-
dicated in the table.
Note 1. Confirm system safety before turning the power ON/OFF or resetting.
2. Do not disassemble the PT for repair or modification.
Cause
Power is not being supplied.
Power supply fuse has blown.
Screen No. 0 has been read at the
host side.
The system startup waiting time has
not elapsed yet.
The Transmit mode has not been
established.
Not connected to the Support Tool.
The PT model setting and direct
connection setting at the Support
Tool do not match the NT31/NT31C.
Memory switch settings do not
match.
NT31/NT31C and host are not
correctly connected.
In an RS-422A/485 connection, the
terminator setting is incorrect.
In an NT Link (1:N) connection, there
is duplication in the unit numbers.
The power to the NT31/NT31C,
NT-AL001 or host is OFF.
Malfunction due to external noise
The NT31/NT31 has developed
trouble.
Malfunction due to external noise
The touch panel is broken.
The NT31/NT31C changes the mode
when host link communication is
used.
Remedy
Check the connections and make sure that power is
supplied correctly. (3-1-3 Power Supply Connection,
page 33)
Contact your OMRON service center.
This is not an error. Change the screen number
from screen number 0. (Setting the screen number
to 0 turns the screen off.)
This is not an error. The display will appear after the
waiting time has elapsed.
Display the System Menu and select the Transmit
mode. (6-6 Transmitting the Screen Data, page 155)
Check the installation of the connector cable. (3-2
Connecting to the Support Tool, page 35)
Using the PT Configuration settings of the Support
Tool, set the PT model and direct connection
settings that match the NT31/NT31C.
Check the communication setting in the Memory
Switch menu of the Maintenance mode, and match
the communication protocol settings for the host and
NT31/NT31C. (6-7 Setting Conditions for
Communications with Host by Using Memory
Switches, page 157)
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)
Make the NT31/NT31C 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)
Make the settings again so that there is no
duplication. (6-7-4 Setting the NT Link (1:N) Method
(Standard/High-speed), page 163)
Check the power supply.
Carry out grounding work in accordance with the
conditions by referring to 3-1-4 Grounding, page 34.
Contact your OMRON service center.
Carry out grounding work in accordance with the
conditions by referring to 3-1-4 Grounding, page 34.
Test the touch panel with I/O Check in the
MAINTENANCE MODE menu. If there is an error,
contact your OMRON service center.
This is an NT31/NT31C 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).
Section 7-1