Operating Environment Precautions

Application Precautions

•The PC outputs may remain ON or OFF due to deposition or burning of the output relays or destruction of the output transistors. As a countermeasure for such problems, external safety measures must be provided to ensure safety in the system.

•When the 24-VDC output (service power supply to the PC) is overloaded or short-circuited, the voltage may drop and result in the outputs being turned OFF. As a countermeasure for such problems, external safety measures must be provided to ensure safety in the system.

!WARNING When transferring programs to other nodes, or when making changes to I/O memory, confirm the safety of the destination node before transfer. Not doing so may result in injury.

!Caution Execute online edit only after confirming that no adverse effects will be caused by extending the cycle time. Otherwise, the input signals may not be readable.

!Caution Tighten the screws on the terminal block of the AC Power Supply Unit to the torque specified in the operation manual. The loose screws may result in burning or malfunction.

4Operating Environment Precautions

!Caution Do not operate the control system in the following places:

•Locations subject to direct sunlight.

•Locations subject to temperatures or humidity outside the range specified in the specifications.

•Locations subject to condensation as the result of severe changes in tempera- ture.

•Locations subject to corrosive or flammable gases.

•Locations subject to dust (especially iron dust) or salts.

•Locations subject to exposure to water, oil, or chemicals.

•Locations subject to shock or vibration.

!Caution Take appropriate and sufficient countermeasures when installing systems in the following locations:

•Locations subject to static electricity or other forms of noise.

•Locations subject to strong electromagnetic fields.

•Locations subject to possible exposure to radioactivity.

•Locations close to power supplies.

!Caution The operating environment of the PC System can have a large effect on the lon- gevity and reliability of the system. Improper operating environments can lead to malfunction, failure, and other unforeseeable problems with the PC System. Be sure that the operating environment is within the specified conditions at installa- tion and remains within the specified conditions during the life of the system.

5Application Precautions

Observe the following precautions when using the PC System.

!WARNING Always heed these precautions. Failure to abide by the following precautions could lead to serious or possibly fatal injury.

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