80
8-1
Checking Operation
The hardware status of the NT600M can be checked with the Maintenance
Menu. Symptoms and corrective measures for errors that cannot be checked
are shown in the table below.
Symptom
Probable cause
Corrective measures, processing
POWER indicator does
not light.
Power is not being input.
Provide a power supply with a rated voltage of 100 to
240 VAC.
A fuse is blown.
Contact your OMRON representative.
Screen does not display. It is waiting for a command from the
host, or there is no screen data, or
the contrast is poorly adjusted.
Transfer a command from the host. Screen data
should be registered at the Support Tool in advance.
Adjust the contrast.
The System ROM is not installed
correctly.
Mount the System ROM into the socket in the correct
direction, and make sure that it is secured.
Screen suddenly goes
blank.
Screen no. 0 has been called by
the host.
There is no problem. Correct the application program.
Cannot communicate
i h S
T l
PT is not in Transmit Mode.
Select Transmit Mode from the System Menu.
with Support Tool.
There is a faulty connection with
the Support Tool.
Check connecting cables.
Cannot communicate
using Host Interface Unit
DIP switch settings are not correct.
Check PT settings under the Maintenance Mode and
be sure that settings match the host settings.
s g os
e ace U
(Serial communications
type)
Host Interface Unit connections are
faulty.
Check wiring of connecting cables.
Use shielded wire.
Check whether the cables are within the maximum
lengths.
For the NT600M-LK202, terminator
settings are not correct.
When using RS-422A communications, specify only
the last Terminal from the host as the terminator (turn
on termination resistance on the last terminal only).
Cannot communicate
using Host Interface Unit
(Parallel
communications type))
Communications timing with Host
Interface Unit is incorrect.
Check switch setting and the host’s strobe cycle time.
The Maintenance Mode can be used to check
communications.
Message displayed
indicating Host Interface
Unit is missing.
The Host Interface Unit is not
installed properly.
Install the Host Interface Unit.
Check to be sure that the specifications match for the
System ROM and the Host Interface Unit.
Lamp remains lit when
screens are changed.
Lamp and touch switch are
overlapping.
Touch switches can be used as lamps just as they are.
(They have shared functions.)
Message displayed
indicating screen data is
corrupted.
1) Screen memory is defective.
2) There was a power interruption
or the reset button was pressed
while data was being transferred.
1) Replace the screen memory.
2) Initialize the screen memory, and then re-transmit
the data.
Buzzer sounds and
RUN indicator turns off.
Operation suddenly
stops. Displays go out
and do not return.
1) System ROM is not properly
installed.
2) There was a malfunction due to
external noise
1) Mount the System ROM into the socket in the
correct direction, and make sure that it is secured.
2) Keep the communications cable separate from
sources of noise. Install noise filters in power supply
lines.
System messages
display is wrong.
DIP switch 1-3 is OFF.
Turn off the power, then set DIP switch 1-3 to ON and
turn the power on again.
8-2
Changing the Lithium Backup Battery
In the NT600M, a lithium cell is used for a memory backup. If the BAT LOW
indicator on the front panel lights, replace the battery within five days.
Battery model
3G2A9-BAT08
Battery backup time
5 years at 25
%
C.
Replacement time
Within 5 minutes from the time power is turned off.
Note
1. The battery can also be replaced while the power is on. If you do it that
way, then there is no need to replace the battery within five minutes, but
you must exercise care in handling.
Changing the Lithium Backup Battery
Section 8-2
Summary of Contents for NT600M Series
Page 1: ...NT600M Programmable Terminal Operation Manual Revised October 1997 ...
Page 2: ...iv ...
Page 4: ...vi ...
