Rockwell Automation Allen-Bradley MobileView 2711T-VMBRACKET, Руководство пользователя

Страница: 30 / 104

30 Rockwell Automation Publication 2711T-UM001E-EN-P - March 2019
Chapter 3 Operate the Terminal
Adjust the Touch Screen
Adjust the Display Brightness
All MobileView 2711T terminals have an adjustable display-brightness setting
that can be adjusted through the Power Options icon on the terminal desktop.
The display-brightness default setting is 70%.
Recalibrate the Touch Screen
The touch screen is calibrated before shipment. You can recalibrate the touch
screen. For more information, see
Touch Calibration on page 74 .
WARNING: If the LCD screen darkens or if the backlight is not functioning
properly, the screen may be difficult to read and use of this screen could result in
a potentially hazardous outcome. Do not use the LCD touch screen under these
circumstances.
The design of the system must take into account the possibility of the LCD screen or
LCD touch screen losing functionality and unable to be used to maintain or change
control of the system. The touch screen shall not be the single point of control of
critical functions and is not intended to replace an E-stop.
Design of the system should follow all applicable code and good engineering
practice. Factors to consider include:
• The possibility of an unreadable LCD screen
• The possibility of an inoperable touch screen
• Unexpected communication errors or delays
• Operator error in the control of the system
• Proper use of E-stops and other safety practices
The user shall provide means to achieve a safe state during anomalies and to verify
that the system has adequate redundancy for critical functions.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
IMPORTANT Increasing the brightness from the default setting reduces the life of the LED
backlight, particularly at high temperatures.