User manual

Preface
LT Series User Manual
12
 About the LT Unit’s Display Panel
• The data that is currently displayed on the LT unit's screen, the screen’s
brightness, and the LT unit’s voltage
*1
each affect the screen’s intensity
of
Contouring — a wavelike pattern that is created when some parts of
the screen are brighter than others.
• The minute, dark and light grid-points on the display panel’s surface is
part of the LT unit’s design and are not defects.
• Extended shadows, or “Crosstalk”, may appear on the sides of screen
images. This is normal for an LCD panel.
• Sometimes the display area may look as if the display colors have
changed.
This is a common attribute of LCDs and is not a defect.
• Displaying a single image for long periods of time can cause an afterim-
age to remain when the screen display is changed.
To prevent this effect:
Use the LT unit’s “Standby Mode,” which automatically turns the
screen OFF when no input is entered within a specified period of
time.
Section 6.3.1 – “System Setup”
• Write “FFFFh” to the System Data Area’s “Screen Display Off” address
*2
to turn the screen display OFF when the following actions are not per-
formed within the user-specified period of time.
• Change Screen
• Touch Screen
• Alarm Display
Do NOT display any single screen for a long period of time. Try to
change the screen display periodically.
1 Operating the LT unit in the lower range of its allowable operating voltage may
affect the intensity of contouring.
2 The following addresses assume all System Data Area settings are entered. If they
are
not all entered, the correct word address may be different, since the following
addresses are relative, not fixed, addresses.
With the Direct Access Method — use System Data Area word address +9
With the Memory Link Method — use System Data Area word address +12
LT Editor Device Connection Manual (included with the LT Edi-
tor software)/GP-PRO/PBIII Device/PLC Connection Manual
(included with the C-Package software)