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Responding to Displayed Error Messages Section 7-2
7-2 Responding to Displayed Error Messages
When the NT631/NT631C displays an error message, find the corresponding
symptoms in the appropriate table below and respond by following the Rem-
edy indicated in the table.
For details of the error messages displayed when using Memory Unit and cor-
rective action to take for them, refer to 3-5 Using a Memory Unit.
7-2-1 Errors Occurring at Start of Operation and Their Remedies
The table below shows the errors that can occur when the power to the
NT631/NT631C is turned ON and when operation starts, and their remedies.
The display is dim. Insufficient contrast or brightness Increase the contrast/brightness (pages 187 and
189).
Backlight defective, or its life has
expired
Replace the backlight (page 235).
The display is too faint. The contrast is too high. Reduce the contrast (page 187).
The digits in numeral dis-
play come out as *.
The number of digits of a numeric
value in a numeral memory table
exceeds the set number.
• Confirm the values of the PLC words allocated to
the numeral memory table.
• Allocate one PLC word to each numeral memory
table.
NT631/NT631C
Symptoms
Cause Remedy
Message Cause Remedy
[No Comm. Protocol]
Set the comm. Protocol by MAINTE-
NANCE MODE.
No communications protocol has
been set.
Communications protocol and
screen data type are mismatched
Using the memory switches, set the com-
munications method to be used for com-
munications with the host. (6-7 Setting
Conditions for Communications with Host
by Using Memory Switches)
[Screen Data Error]
Screen Data corrupted.
Initialize Screen Memory, and download
Screen Data again.
- The power was switched OFF
during screen data initialization,
checking, or transmission.
- Transmission of screen data
was interrupted.
- Illegal data has been written to
the screen data memory.
Initialize the screen data memory by oper-
ation at the System Menu, then re-transmit
the screen data. (6-4-1 Clearing Screen
Data, page 135)
If the problem persists, contact your
OMRON service center.
[No Screen Data]
No Screen Data is saved in Screen Mem-
ory.
Download Screen Data using by the Sup-
port Tool.
Then set the PT to the TRANSMIT
MODE, and download Screen Data
again.
No screen data is registered. Transmit screen data from the Support
Tool.
[No Direct Connection Info.]
No Direct Connection Information is set
in Screen Data.
Set Direct Connecting Information in
Screen Data using by the Support Tool.
Then set the PT to the TRANSMIT
MODE and download Screen Data again.
Allocated words have not been set
for the PT status control area and
PT status notify area.
Allocate words for the PT status control
area and PT status notify area with the
Support Tool and then transmit the direct
connection information to the NT631/
NT631C.
[Incorrect Screen Data]
Screen Data in Screen Memory do not
match with the System Program.
Initialize Screen Memory, and download
Screen Data again.
The type of registered screen data
does not match that at the NT631/
NT631C.
Initialize the screen data memory, then
transmit the correct screen data. (6-4-1
Clearing Screen Data, page 135)