Omron NT31 NT31C manual Troubleshooting, NT31/NT31C Symptoms Cause Remedy, Message is displayed

TroubleshootingSection 7-1

7-1 Troubleshooting

When a fault relating to the operation of the NT31/NT31C occurs, find the symp- toms in the table below and respond by following the corresponding Remedy in- dicated in the table.

Note 1. Confirm system safety before turning the power ON/OFF or resetting.

2. Do not disassemble the PT for repair or modification.

NT31/NT31C Symptoms	Cause	Remedy
Power LED fails to come	Power is not being supplied.	Check the connections and make sure that power is
ON		supplied correctly. (3-1-3 Power Supply Connection,
		page 33)
	Power supply fuse has blown.	Contact your OMRON service center.
Nothing is displayed on	Screen No. 0 has been read at the	This is not an error. Change the screen number
the screen.	host side.	from screen number 0. (Setting the screen number
		to 0 turns the screen off.)
	The system startup waiting time has	This is not an error. The display will appear after the
	not elapsed yet.	waiting time has elapsed.
Cannot communicate with	The Transmit mode has not been	Display the System Menu and select the Transmit
the Support Tool	established.	mode. (6-6 Transmitting the Screen Data, page 155)
	Not connected to the Support Tool.	Check the installation of the connector cable. (3-2
		Connecting to the Support Tool, page 35)
	The PT model setting and direct	Using the PT Configuration settings of the Support
	connection setting at the Support	Tool, set the PT model and direct connection
	Tool do not match the NT31/NT31C.	settings that match the NT31/NT31C.
Cannot communicate with	Memory switch settings do not	Check the communication setting in the Memory
the host	match.	Switch menu of the Maintenance mode, and match
Cannot switch from the		the communication protocol settings for the host and
		NT31/NT31C. (6-7 Setting Conditions for
system initializing screen.
		Communications with Host by Using Memory
Communication error
		Switches, page 157)
message is displayed
	NT31/NT31C and host are not	Check that the type, length, and installation of the
when communicating to
the host.	correctly connected.	connector cable match the specifications. (Section 4
		Connecting to the Host from the RS-232C Port, and
		Section 5 Connecting to the Host from the
		RS-422A/485 Port)
	In an RS-422A/485 connection, the	Make the NT31/NT31C and PC termination
	terminator setting is incorrect.	resistance settings correctly. (Section 4 Connecting
		to the Host from the RS-232C Port, and Section 5
		Connecting to the Host from the RS-422A/485 Port)
	In an NT Link (1:N) connection, there	Make the settings again so that there is no
	is duplication in the unit numbers.	duplication. (6-7-4 Setting the NT Link (1:N) Method
		(Standard/High-speed), page 163)
	The power to the NT31/NT31C,	Check the power supply.
	NT-AL001 or host is OFF.
The buzzer has sounded	Malfunction due to external noise	Carry out grounding work in accordance with the
and the RUN LED is OFF.		conditions by referring to 3-1-4 Grounding, page 34.
	The NT31/NT31 has developed	Contact your OMRON service center.
	trouble.
The touch panel does not	Malfunction due to external noise	Carry out grounding work in accordance with the
respond.		conditions by referring to 3-1-4 Grounding, page 34.
	The touch panel is broken.	Test the touch panel with I/O Check in the
		MAINTENANCE MODE menu. If there is an error,
		contact your OMRON service center.
The PC mode has	The NT31/NT31C changes the mode	This is an NT31/NT31C specification. When using a
changed to the monitor	when host link communication is	PC that can also be connected using the NT Link
mode.	used.	method, use an NT Link connection (there is no
		mode change with the NT Link method).

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