Display Unit Precautions

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, optional 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.

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) Interlock and other circuits designed to interrupt or oppose normal machine movement (such as Emergency Stop, General Protection, and forward and reverse rotation), as well as those designed to prevent machine damage (such as upper, lower, and traverse movement limit positioning) should all be designed to be located 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, unexpected things may occur in those areas. Therefore, and 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.

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 fault 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.

When using the display unit with transportation vehicles (trains, cars, and ships), disaster and crime prevention devices, various types of safety equipment, and medical devices that are not life-support related, use redundant and/or failsafe system designs to ensure proper reliability and safety.

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.

Do not disassemble or modify the display unit. Doing so may cause fire or an electric shock.

Do not operate the display unit in an environment where flammable gases are present. This may cause an explosion.

Unplug the power cord from the power supply prior to installing or wiring the display unit. This is to prevent electrical shock or equipment damage.

After completing any wiring on the display unit, be sure the protective plastic cover on the terminal block is reattached. If this cover is not reattached, an electrical shock could occur.

Disconnect the power cord from the power supply before wiring the display unit. This is to prevent an electrical shock.

Do not use voltage beyond the specified range for the display unit. Doing so may cause fire or an electric shock.

The cables connected to the display unit should be secured by cable clamps to prevent adding weight or tension of the cables to the connectors or terminals.

Wiring on the display unit should be checked to confirm that both the operating voltage and wiring terminal locations are correct. If either the voltage or wiring terminal location is incorrect, it can cause a fire or accident.

Never touch a live power terminal. Doing so could cause an electrical shock or a machine malfunction.

Unplug the power cord on the display unit before either cleaning the unit or attaching/detaching screws on the power terminal. This is to prevent an electrical shock.

When replacing the backlight on the display unit, be sure the power cord is unplugged. As electrical shock and burn hazards exist, ensure the display unit is powered down and wear safety gloves.

Do not connect or disconnect host and display unit communication cables while the display unit is ON.

The display unit uses a lithium battery for backing up its internal clock data. As the battery may explode if replaced incorrectly, do not replace the battery yourself. When replacement is required, please contact your local distributor or Pro-face service and repair center.

Isolate all input/output signal lines from all power wiring or power cables via a separate wiring duct. This is to prevent a display unit malfunction due to excessive noise.

Be sure all cable connectors are securely attached. A loose connection may cause incorrect input or output signals.

For the FG terminal, ground the wire separately from FG lines on other equipment. This is to prevent electrical shock or malfunctions.

Be sure to use only the designated torque to tighten the terminal block screws on the display unit. If these screws are not tightened firmly, it may cause a short-circuit, fire, or incorrect operations.

Be sure that metal particles and wiring debris do not fall inside the display unit. This is to prevent fire, malfunction, or incorrect operations.

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.

When attaching an I/O unit, be sure the power is turned OFF. If the power is ON when attaching or detaching the I/O unit, damage or malfunction to the I/O unit may occur.

When ejecting a CF Card, make sure the CF card access lamp is OFF. Data on the CF Card may be damaged.

When accessing a CF Card, be sure not to power OFF or reset the display unit, or eject the CF Card. Create special application screens that prevent access to the CF card. Use the screen when performing operations like turning the power OFF, resetting the display unit, or inserting and removing the CF Card.

When the product is disposed of, it should be done so according to your country's regulations for similar types of industrial waste.

Do not press the unit's touch panel with excessive force or with a hard object. This can damage the display. Do not press the touch panel with a pointed object, such as the tip of a mechanical pencil or screwdriver. This can damage the touch panel.

Do not install the display unit where the ambient temperature exceeds the specified range. Doing so may cause a unit to malfunction.

To prevent abnormally high temperatures from occurring inside the display unit, do not use in a location where ventilation slots on the display unit are restricted or blocked.

Do not operate the display unit in areas where large, sudden temperature changes can occur. This could cause a malfunction.

Do not allow water, liquids or metal fragments to enter inside the display unit casing. This could cause a malfunction or electric shock. (The allowable pollution degree is 2.)

Do not operate or store the display unit in locations where it can be exposed to direct sunlight, high temperatures, excessive dust, moisture, or vibration.

Do not operate or store the display unit where chemicals evaporate, or where chemicals are present in the air.

Corrosive chemicals: Acids, alkalines, liquids containing salt.

Flammable chemicals: Organic solvents

To remove dirt or oil from the display unit surface, use a soft cloth moistened with a diluted neutral detergent. Do not use paint thinner or organic solvents.

The sun's ultraviolet rays could cause the display quality to deteriorate. Do not use or store the display unit in areas with direct sunlight.

Do not store the display unit in an area where the temperature is lower than that recommended in the specifications. Doing so may cause the LCD display liquid to congeal, which can damage the LCD. Also, if the storage temperature is higher than the specified level, the LCD liquid may become isotropic and cause irreversible damage to the LCD. Store the display unit at temperatures within the specifications.

After turning OFF the display unit, be sure to wait a few seconds before turning it ON again. The display unit may not operate correctly if it is restarted too quickly.

Be sure to back up the screen data and logic programs in case they are lost accidentally.