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Using a Memory Unit Section 3-5
• The RUN LED flashes.
If a protect setting error occurs when executing manual transmission, it is pos-
sible to return to the Memory Unit manual transmission screen by pressing
the OK touch switch, but in the case of other errors, the status described
above remains in effect until the NT631/NT631C power is turned OFF or
reset.
Within the PT Model, the
system program inside
memory compatible PT
model
The compatibility relationships are shown below.
When an error occurs, take remedial action by referring to the table below.
NT631
NT631C
System program for NT631/NT631C without the -V suffix, and for
NT631/NT631C with the -V1 and -V2 suffix
NT631C-EV3 System program for NT631C with the -V3 suffix
Error Probable Cause Remedial Action
Mode setting error DIP switches SW1-1 to
SW1-3 are all OFF, or
more than one is ON.
Turn the NT631/NT631C power
OFF, set the Memory Unit DIP
switches correctly, then turn the
NT631/NT631C power back ON.
Protect setting error
(automatic transmis-
sion)
Writing to the data write
destination has been pro-
hibited by the setting of
SW2-1 or SW2-2.
Turn the NT631/NT631C power
OFF, set the Memory Unit DIP
switches correctly, then turn the
NT631/NT631C power back ON.
Protect setting error
(manual transmis-
sion)
Writing to the data write
destination has been pro-
hibited by the setting of
SW2-1 or SW2-2.
Perform either of the following pro-
cedures.
• Press the OK touch switch to
return to the Memory Unit manual
transmission screen, make the
correct settings, then try again.
• Turn the NT631/NT631C power
OFF, correct the DIP switches set-
tings of the Memory Unit, then
turn the power back ON.
Flash memory error An error occurred during
initialization of the
NT631/NT631C or Mem-
ory Unit flash memory, or
during write processing.
Turn the NT631/NT631C power
OFF, then back ON. If the error
recurs, the flash memory at the
write destination may be faulty. In
this case, replace the PT.
Verify error An error occurred during
verification processing at
the flash memory of the
NT631/NT631C or the
Memory Unit.
Turn the NT631/NT631C power
OFF, then back ON. If the error
recurs, the flash memory at the
write destination may be faulty. In
this case, replace the PT.
Transmitting data
error
(The automatic
transmission only)
An attempt is made to
transmit data other than a
system program or the
system program of a dif-
ferent PLC model into the
NT631/NT631C as the
system program.
An attempt is made to
write a system program
into the NT631/NT631C
as screen data.
Perform either of the following pro-
cedures.
• Turn the NT631/NT631C power
OFF, correct the DIP switch set-
tings of the Memory Unit, and
then turn the power back ON.
• Turn the NT631/NT631C power
OFF, set the DIP switch settings
to the manual transmission, and
then check the data inside the
Memory Unit.