PL-DU6900/PL-DU7900 User Manual
3
Preface
• After the PL’s backlight burns out, unlike the PL’s
“Standby Mode”, the touch panel is still active. If the op-
erator fails to notice that the backlight is burned out and
touches the panel, a potentially dangerous machine miss-
operation can occur.
If your PL's backlight suddenly turns OFF, use the following
steps to determine if the backlight is actually burned out.
1) If your PL is not set to "Standby Mode" and the screen
has gone blank, your backlight is burned out.
2) Or, if your PL is set to Standby Mode, but touching the
screen does not cause the display to reappear, your
backlight is burned out.
• Do not allow water, liquids, or metal particles to enter
inside the DU's chassis, since they can cause either a
malfunction or an electrical shock. If, however, either of
these events occurs, disconnect the DU unit's power cord
immediately and contact your local DUdistributor.
• Read and understand Chapter 4 “Installation and Wiring”
thoroughly before selecting an installation location for the
DU.
• Do not insert/remove an expansion board or an interface
unit while the DU unit's power cord is connected to the
power supply.
• To prevent a possible explosion, do not install the DU in
areas containing flammable gases.
• The DU is not appropriate for use with aircraft control
devices, aerospace equipment, central trunk data trans-
mission (communication) devices, nuclear power control
devices, or medical life support equipment, due to these
devices’ inherent requirements of extremely high levels of
safety and reliability.
• When using the DU with transportation vehicles (trains,
cars and ships), disaster and crime prevention devices,
various types of safety equipment, non life-support re-
lated medical devices, etc. redundant and/or fail-safe
system designs should be used to ensure the sufficient
degree of reliability and safety.
