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Caution
Section 7-1
8-1 Hardware Faults
When a fault relating to the operation of the NT600S occurs, find the symptoms in
the table belowand respond by following the corresponding “Remedy” indicated in
the table.
Confirm system safety before turning the power ON/OFF or resetting.
Otherwise the system may operate unpredictably.
Do not disassemble for repairs or modification.
Otherwise the product may malfunction.
NT600S 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 “2-2-2 Power Supply Connection”, page 28.)
Power supply fuse has blown Contact your OMRON service center.
Nothing is displayed on
the screen (it is
c
o
m
p
l
e
t
e
l
y
w
h
i
t
e
/
L
C
D
o
r
Screen #0 has been read at the host
side.
This is not an error. Change the screen number.
(Refer to “4-3 Screen Display”, page 124.)
completely white/LCD or
black/EL).
In communication with the Host,
screen data is not transferred to the
NT600S through RS-232C.
Transfer the screen data to the PT using the support
tool.
Meaningless characters
are displayed.
The DIP switches at the rear of the
terminal have been left at their
factory setting (SW2-2 is OFF).
Set DIP switch SW2-2 on the rear of the PT to ON and
switch the power back on.
Communication with the
support tool not possible.
The Transmit Mode has not been
established.
Display the system menu and select the Transmit
Mode.
(Refer to “4-5 Registering the Screen Data”, page 79.)
Not connected to the support tool. Check the installation of the connector cable.
(Refer to “2-3 Connecting to the Support Tool”, page
30.)
PT type setting and direct connection
setting at the support tool do not
match the NT600S.
Using the ”Tool Settings” of the support tool, set the
PT type and direct connection settings that match the
NT600S.
The NT600S Support Tool Mode
setting does not match the support
tool used.
Match the setting for the “Support Tool Mode” option in
the memory switch menu of the Maintenance mode
with the support tool being used.
Cannot communicate with
the PC /Host.
Memory switch settings do not
match.
Check the communication setting in the “Memory
Switch” menu of the Maintenance Mode, and match
the PC and NT600S settings.
(Refer to “4-6 Setting the Conditions of
Communications with the PC/Host by Using the
Memory Switches”, page 83.)
NT600S and PC/HOST are not
correctly connected.
Check that the type, length and installation of the
connector cable match the specifications.
(Refer to “2-4 Connection to a PC by the Host Link”,
page 31, “2-5 Connection to a PC by the NT Link”,
page 43.“3-7 Connection to a PC by C200H Direct”,
page 56, “3-8 Host Connection by RS-232”, page 63.)
When NT link (1:N), there is unit
number duplication.
Set again with no duplication.
In a host link connection, the PC
termination resistance setting is
incorrect.
Set the PC termination resistance correctly.
(Refer to “2-4 Connection to a PC by the Host Link”,
page 31.)
Power not supplied to the NT600S,
PC, or host
Check the power supply.