Troubleshooting

 

Section 7-1

 

 

 

NT631/NT631C

Cause

Remedy

Symptoms

 

 

 

 

 

Updating of numeric val-

Malfunction due to external noise

Carry out grounding work in accordance with the

ues and text is delayed.

 

conditions by referring to 3-1-4 Grounding, page 34.

 

 

 

 

There are too many numeral/text dis-

Reduce the number of numeral/text displays on the

 

plays 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, there

Wire correctly by referring to SECTION 5 Connecting

 

is illegal branching or an erroneous

to the Host from the RS-422A/485 Port.

 

terminator setting.

 

 

 

 

Some of the elements

The quantity of read data exceeds the

Check the maximum number of elements by referring

arranged on a normal

stipulated restriction.

to Display Restrictions in Appendix A of the Refer-

screen are not displayed.

 

ence Manual, creating the screen data again, and

The total of the element coefficients

 

transmitting all of the screen data in a batch to the

 

for the displayed screen is greater

 

NT631/NT631C.

 

than 1024.

 

 

 

 

 

On an overlapping screen,

Since the data is transmitted from the

Check the maximum number of elements by referring

some of the set elements

host in screen units, the number of

to Display Restrictions in Appendix A of the Refer-

are not displayed.

elements on the overlapping screen

ence Manual, creating the screen data again, and

 

has exceeded the maximum permis-

then sending all the screen data in a batch to the

 

sible without being checked by the

NT631/NT631C.

 

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 147).

 

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 Sys-

Protect to Enabled (page 147).

possible.

tem Installer mode is set to Disabled.

 

- Establishing the Transmit

 

 

Screen Memory Protect has been set

Do not turn the PT power OFF during deletion of

mode

to Disabled because the PT power

screen data.

- Displaying the memory

supply was turned OFF during dele-

In the System Installer mode, first change the setting

switch setting screens

tion of screen data.

for Screen Memory Protect to Enabled, then repeat

- Screen data memory

 

the screen data delete operation (page 148)

 

 

check

 

 

- Displaying the initializa-

 

 

tion menu

 

 

- Displaying the calendar/

 

 

time setting screen

 

 

 

 

 

Cannot input numeric val-

The upper/lower (max./min.) limit

Check the screen data’s upper/lower (max./min.) limit

ues

check for numeric value input is in

check setting for numeric value input, and correct it if

 

effect.

necessary. Refer to 2-12 Inputting Numeric Values in

 

 

the Reference Manual for details.

 

 

 

The display is too faint.

The contrast is too high.

Reduce the contrast (page 187).

 

 

 

Cannot input numeric val-

Bit 5 of the PT status control area

Set bit 5 to 0 (OFF). Refer to 2-2-1 PT Status Control

ues/character strings.

(numeral/character string input) is set

Area (Host PT) in the Reference Manual for

 

to 1 (ON).

details.

 

 

 

 

The interlock function is set for the

Inputs are prohibited in input fields when the corre-

 

input field and the controlling interlock

sponding interlock bit is OFF. Check the status of the

 

bit is OFF.

corresponding interlock bit and turn it ON.

 

 

 

Window screen does not

Bit 6 of the PT status control area (PT

Set bit 6 to 0 (OFF). Refer to 2-2-1 PT Status Control

open

window opening) is set to 1 (ON).

Area (Host PT) in the Reference Manual for

 

 

details.

 

 

 

Cannot switch screens

Bit 4 of the PT status control area (PT

Set bit 4 to 0 (OFF). Refer to 2-2-1 PT Status Control

with touch switches

screen switching) is set to 1 (ON).

Area (Host PT) in the Reference Manual for

 

 

details.

 

 

 

Touch switch does not

The interlock function is set for the

Touch switches are disabled when the corresponding

work. (Buzzer sounds.)

touch switch and the controlling inter-

interlock bit is OFF. Check the status of the corre-

 

lock bit is OFF.

sponding interlock bit and turn it ON.

 

 

 

228

Page 245
Image 245
Omron NT631C manual 228