Omron NT631C manual Responding to Displayed Error Messages, Message Cause Remedy, Nance Mode

Responding to Displayed Error Messages		Section 7-2
NT631/NT631C	Cause	Remedy
Symptoms
The display is dim.	Insufficient contrast or brightness	Increase the contrast/brightness (pages 187 and
		189).
	Backlight defective, or its life has	Replace the backlight (page 235).
	expired
The display is too faint.	The contrast is too high.	Reduce the contrast (page 187).
The digits in numeral dis-	The number of digits of a numeric	• Confirm the values of the PLC words allocated to
play come out as *.	value in a numeral memory table	the numeral memory table.
	exceeds the set number.	• Allocate one PLC word to each numeral memory
		table.

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.

Message	Cause	Remedy
[No Comm. Protocol]	No communications protocol has	Using the memory switches, set the com-
Set the comm. Protocol by MAINTE-	been set.	munications method to be used for com-
		munications with the host. (6-7 Setting
NANCE MODE.	Communications protocol and
		Conditions for Communications with Host
	screen data type are mismatched
		by Using Memory Switches)
[Screen Data Error]	- The power was switched OFF	Initialize the screen data memory by oper-
Screen Data corrupted.	during screen data initialization,	ation at the System Menu, then re-transmit
	checking, or transmission.	the screen data. (6-4-1 Clearing Screen
Initialize Screen Memory, and download
	- Transmission of screen data	Data, page 135)
Screen Data again.
	was interrupted.	If the problem persists, contact your
	- Illegal data has been written to	OMRON service center.
	the screen data memory.
[No Screen Data]	No screen data is registered.	Transmit screen data from the Support
No Screen Data is saved in Screen Mem-		Tool.
ory.
Download Screen Data using by the Sup-
port Tool.
Then set the PT to the TRANSMIT
MODE, and download Screen Data
again.
[No Direct Connection Info.]	Allocated words have not been set	Allocate words for the PT status control
No Direct Connection Information is set	for the PT status control area and	area and PT status notify area with the
	PT status notify area.	Support Tool and then transmit the direct
in Screen Data.
		connection information to the NT631/
Set Direct Connecting Information in
		NT631C.
Screen Data using by the Support Tool.
Then set the PT to the TRANSMIT
MODE and download Screen Data again.
[Incorrect Screen Data]	The type of registered screen data	Initialize the screen data memory, then
Screen Data in Screen Memory do not	does not match that at the NT631/	transmit the correct screen data. (6-4-1
	NT631C.	Clearing Screen Data, page 135)
match with the System Program.
Initialize Screen Memory, and download
Screen Data again.

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