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SAFETY PRECAUTIONS
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(Read these precautions before use.)
Before installation, operation, maintenance or inspection of this product, thoroughly read through and
understand this manual and all of the associated manuals. Also, take care to handle the module properly
and safely.
This manual classifies the safety precautions into two categories: “DANGER” and “CAUTION.”
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DANGER
CAUTION
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Indicates that incorrect handling may cause hazardous conditions,
resulting in death or severe injury.
Indicates that incorrect handling may cause hazardous conditions,
resulting in medium or slight personal injury or physical damage.
Depending on the circumstances, procedures indicated by CAUTION may also cause severe injury.
It is important to follow all precautions for personal safety.
Store this manual in a safe place so that it can be taken out and read whenever necessary. Always
forward it to the end user.
[Design Precautions]
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DANGER
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To prevent malfunctions of the PLC system that may be caused by illegal e-mail, take proper
countermeasures (such as virus detection) so that illegal e-mail is not received by the mail
server of this module.
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If it is necessary to ensure the security of the PLC system against unauthorized access from
external devices via the Internet, appropriate measures must be incorporated by the user.
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When controlling the PLC (modifying data) while it is in operation by connecting computer
peripheral devices to the main unit or connecting personal computers to the extension device,
make sure to have an interlock circuit outside of the PLC to ensure safe system operation.
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