Omron NT31 NT31C manual To the Host from the RS-422A/485 Port, Displaying the memory

Troubleshooting			Section 7-1
NT31/NT31C Symptoms		Cause	Remedy
Updating of numeric		Malfunction due to external noise	Carry out grounding work in accordance with the
values and text is			conditions by referring to 3-1-4 Grounding, page 34.
delayed.
		There are too many numeral/text	Reduce the number of numeral/text displays on the
		displays on the displayed screen.	screen for which updating is delayed.
		The cycle time is extended due to	Shorten the host cycle time.
		heavy processing at the host.
		In an RS-422A/485 connection,	Wire correctly by referring to Section 5 Connecting
		there is illegal branching or an	to the Host from the RS-422A/485 Port.
		erroneous terminator setting.
Some of the elements		The quantity of read data exceeds	Check the maximum number of elements by
arranged on a normal		the stipulated restriction.	referring to Display Restrictions in Appendix A of the
screen are not displayed.			Reference Manual. Create the screen data again
		The total of the element coefficients
			and then transmit all of the screen data in a batch to
		for the displayed screen is greater
			the NT31/NT31C.
		than 1024.
On an overlapping screen,		Since the data is transmitted from	Check the maximum number of elements by
some of the set elements		the host in screen units, the number	referring to Display Restrictions in Appendix A of the
are not displayed.		of elements on the overlapping	Reference Manual. Create the screen data again
		screen has exceeded the maximum	and then send all the screen data in a batch to the
		permissible without being checked	NT31/NT31C.
		by the Support Tool.
The System Menu cannot		Display System Menu under Change	In the System Installer mode, set Display System
be called up.		System Settings in the System	Menu to Enabled (page 153).
		Installer mode is set to Disabled.
The following System		Screen Memory Protect under	In the System Installer mode, set Screen Memory
Menu operations are not		Change System Setting in the	Protect to Enabled (page 153).
possible.		System Installer mode is set to
-	Establishing the	Disabled.
	Transmit mode
-	Displaying the memory
	switch setting screens
		Screen Memory Protect has been	Do not turn the PT power OFF during deletion of
-	Screen data memory
		set to Disabled because the PT	screen data.
	check	power supply was turned OFF during	In the System Installer mode, first change the
-	Displaying the	deletion of screen data.	setting for Screen Memory Protect to Enabled, then
	initialization menu		repeat the screen data delete operation (pages 153
-	Displaying the		and 154)
	calendar/time setting
	screen
Cannot input numeric		The upper/lower (max./min.) limit	Check the screen data’s upper/lower (max./min.)
values		check for numeric value input is in	limit check setting for numeric value input, and
		effect.	correct it if necessary. Refer to 2-12 Inputting
			Numeric Values in the Reference Manual for details.
Cannot input numeric		Bit 5 of the PT status control area	Set bit 5 to 0 (OFF). Refer to 2-2-1 PT Status
values/character strings.		(numeral/character string input) is	Control Area (Host ↔ PT) in the Reference Manual
		set to 1 (ON).	for details.
		The interlock function is set for the	Inputs are prohibited in input fields when the
		input field and the controlling	corresponding interlock bit is OFF. Check the status
		interlock bit is OFF.	of the corresponding interlock bit and turn it ON.
Window screen does not		Bit 6 of the PT status control area	Set bit 6 to 0 (OFF). Refer to 2-2-1 PT Status
open		(PT window opening) is set to 1	Control Area (Host ↔ PT) in the Reference Manual
		(ON).	for details.
Cannot switch screens		Bit 4 of the PT status control area	Set bit 4 to 0 (OFF). Refer to 2-2-1 PT Status
with touch switches		(PT screen switching) is set to 1	Control Area (Host ↔ PT) in the Reference Manual
		(ON).	for details.
Touch switch does not		The interlock function is set for the	Touch switches are disabled when the
work. (Buzzer sounds.)		touch switch and the controlling	corresponding interlock bit is OFF. Check the status
		interlock bit is OFF.	of the corresponding interlock bit and turn it ON.

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