# Display Unit Precautions

The following precautions allow you to use the display unit safely.

Please read this manual and all related manuals carefully to understand the correct operation and features of display unit.

WARNING
ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Do not connect or disconnect host and display unit communication cables while the display unit is ON. The display unit includes non-rechargeable or rechargeable batteries for both the clock and data backup in the backup memory. For the display unit with non-rechargeable batteries, you can replace these. For how to replace batteries, refer to the hardware manual of the display unit used. For display units with rechargeable batteries, incorrectly replacing the batteries may cause battery explosion, so do not replace these. When replacement is required, please contact your local distributor or Schneider Electric Customer Care Center. Failure to follow these instructions can result in death, serious injury, or equipment damage.

WARNING
UNINTENDED EQUIPMENT OPERATION Touch panel switches should NOT be used to make a switch that could result in human injury or equipment damage. Trouble with the display unit, units, and cables which keep the output ON or OFF could result in a serious accident. An output signal that could result in a serious accident must be equipped with a monitoring circuit such as a limiter. Please design the system so that important operation switches are handled by equipment other than the display unit. This will prevent potential accidents as a result of incorrect output or malfunctions. Touch panel switches should NOT be used for a device's Emergency Stop Switch. The Ministry of Health, Labor and Welfare requires all industrial machinery/systems must be equipped with a mechanical, manually operate emergency stop switch. Also, for other kinds of systems, similar mechanical switches must be provided to ensure safe operation of those systems. Do not create touch panel switches to control machine safety operations. Emergency stop switches and the like should be installed as separate hardware switches. Be sure to design your system so that a communication interruption between the display unit and host controller will not cause equipment to malfunction. This is to prevent any possibility of bodily injury or equipment damage. Do not use the display unit as a warning device for critical alarms that can cause serious operator injury, machine damage or halt system operation. Critical alarm indicators and their control/activation units must be designed using stand alone hardware and mechanical interlocks. Do not use display units with aircraft control devices, aerospace equipment, central trunk data transmission (communication) devices, nuclear power control devices, or medical life support equipment, due to their inherent requirement for extremely high levels of safety and reliability. Do not use for these purposes. After the display unit's backlight burns out, the touch panel is still active. This is unlike the display unit's Standby Mode. If the operator fails to notice that the backlight is burned out and touches the panel, a potentially dangerous machine operation error can occur. Therefore, do not create touch panel switches that may cause injury and/or equipment damage. If the display unit backlight is OFF, use the following to determine if the backlight is burned out. (1) If the screen has gone blank although the display unit is not set up to enter Standby Mode, then the backlight is burned out. (2) If screen has gone blank and the display unit is set up to enter Standby Mode, touch the screen or perform some other input operation. If the screen does not reappear, the backlight is burned out. Be sure to design the control system so that, in the event of a power failure or a display unit accident, the user system's overall safety integrity will be maintained. If this is not done, incorrect output signals or a display unit malfunction may cause an accident. (1) Emergency stops, safety circuits, interlocks that operate with opposing actions such as clockwise/counterclockwise rotation, and interlocks that prevent machine damage with upper, bottom, movement, and other limits, should be designed outside the display unit. (2) When the display unit generates a Watchdog Timer Error during logic program operation, the logic program operation will halt. Also, when errors occur in Input/Output control areas that the display unit cannot detect, unanticipated operations may occur. Therefore, to prevent unsafe machine movement, a Failsafe Circuit should be created which is completely external to the display unit. For a failsafe circuit, please refer to the hardware manual section titled "Installation Precautions". (3) If a problem arises with an external unit's relay or transistor, causing an output (coil) to remain either ON or OFF, a major accident can occur. To prevent this, be sure to set up external watchdog circuits that will monitor vital output signals. Design a circuit that supplies power to the display unit I/O, before the display unit starts up. If the display unit program enters RUN mode before the I/O unit turns ON, an incorrect output (signal) or malfunction could cause an accident. Design a logic program with interlock circuits that ensure the safety of the system in the event of a display or control error, a data transmission error, or power failure between the display unit and connected units. If this is not done, incorrect output signals or a display unit malfunction may cause an accident. Be sure to read the display unit manual carefully before performing program changes, enabling forces, or using the RUN, STOP, and PAUSE commands. Operation mistakes can cause accidents or damage machinery. Failure to follow these instructions can result in death, serious injury, or equipment damage.

NOTICE
LOSS OF DATA Data loss may occur accidentally. Please periodically back up data on the display unit and on external storage. Once data is lost, recovery is not possible. When accessing external storage, do not power OFF or reset the display unit, or disconnect external storage. You may damage the external storage. When ejecting a SD Card, make sure the SD Card access lamp (LED) is OFF. Data on the SD Card may be damaged. When removing the CFast Card, always be certain to power OFF the display unit. There is a danger that data may be damaged on the CFast Card. Failure to follow these instructions can result in equipment damage.