Omron manual Troubleshooting, Remedy indicated in the table, NT631/NT631C Cause Remedy Symptoms

TroubleshootingSection 7-1

7-1	Troubleshooting
			When a fault relating to the operation of the NT631/NT631C occurs, find the
			symptoms in the table below and respond by following the corresponding
			Remedy indicated 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.
NT631/NT631C			Cause	Remedy
Symptoms
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 the		Screen No. 0 has been read at the		This is not an error. Change the screen number from
screen.		host side.		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)
		Not connected to the Support Tool.		Check the installation of the connector cable. (3-2
				Connecting to the Support Tool)
		The PT model setting and direct con-		Using the PT Configuration settings of the Support
		nection setting at the Support Tool do		Tool, set the PT model and direct connection settings
		not match the NT631/NT631C.		that match the NT631/NT631C.
Cannot communicate with		Memory switch settings do not match.		Check the communications setting in the Memory
the host				Switch menu of the Maintenance mode, and match
Cannot switch from the				the communications protocol settings for the host and
				NT631/NT631C. (6-7 Setting Conditions for Commu-
system initializing screen.
				nications with Host by Using Memory Switches)
Communications error
		NT631/NT631C and host are not cor-		Check that the type, length, and installation of the
message is displayed
when communicating to		rectly connected.		connector cable match the specifications. (SECTION
the host.				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 NT631/NT631C and PLC termination resis-
		terminator setting is incorrect.		tance 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 duplica-
		is duplication in the unit numbers.		tion. (6-7-4 Setting the NT Link (1:N) Method (Stan-
				dard/High-speed), page 158)
		The power to the NT631/NT631C, NT-		Check the power supply.
		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 NT631/NT631 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 MAINTE-
				NANCE MODE menu. If there is an error, contact
				your OMRON service center.
The PLC mode has		The NT631/NT631C changes the		This is an NT631/NT631C specification. When using
changed to the monitor		mode when Host Link communica-		a PLC that can also be connected using the NT link
mode.		tions are used.		method, use an NT link connection (there is no mode
				change with the NT link method).

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