Omron NT21 Series, Reference Manual

Page: 422 / 466

6-1 Section Troubleshooting
413
PT Symptoms Remedy Cause
Cannot input numeric
values The upper/lower (max./min.) limit
check for numeric value input is in
effect. Check the screen data’s upper/lower (max./min.)
limit check setting for numeric value input, and
correct it if necessary (for numeric key type, refer to
page 183; for thumbwheel type, refer to page 191).
Cannot input numeric
values/character strings. Bit 5 of the PT status control area
(numeral/character string input) is
set to 1 (ON). Set bit 5 to 0 (OFF) (page 54).
Cannot operate recipe
elements using touch
switches on the PT. Interlock bit set in the recipe
elements is OFF. Check the status of the interlock bit set in the recipe
elements and turn it ON.
Cannot change recipe
data (parameters) using
touch switch operations
on the PT. Editing of records specified in the
recipe data using the PT has been
set to disabled (the default setting)
using the Support Tool. Recreate the screen data with the Support Tool to
enable editing of specified recipe data, and then
send all the data in a single operation to the PT.
Recipe data details are
not displayed on screen. Specified recipe data is not set on
screen. Recreate the recipe data on screen using the
Support Tool, and then send all the screen data in a
single operation to the PT.
Window screen does not
open Bit 6 of the PT status control area
(PT window opening) is set to 1
(ON). Set bit 6 to 0 (OFF) (page 53).
Cannot switch screens
with touch switches Bit 4 of the PT status control area
(PT screen switching) is set to 1
(ON). Set bit 4 to 0 (OFF) (page 54).
Buzzer sounds – cannot
use touch switch or input
(numeral or character
string) The interlock function is set for the
touch switch or input field and the
controlling interlock bit is OFF. Check the status of the corresponding interlock bit
and turn it ON.
The display is dim. Insufficient contrast or brightness Increase the contrast/brightness.
(Refer to Section 6 of the
Setup Manual.)
Backlight defective, or its life has
expired Replace the backlight.
(Refer to Section 6 of the
Setup Manual.)
The display is too faint. The contrast is too high. Reduce the contrast.
(Refer to Section 6 of the
Setup Manual.)
The digits in numeral
display come out as *. The number of digits of a numeric
value in a numeral memory table
exceeds the set number.
•
Confirm the values of the PC words allocated to the
numeral memory table.
•
Allocate one PC word to each numeral memory
table.
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