Mitsubishi-electric QJ71C24N Manuel d'utilisateur télécharger pdf (Page 3)

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• SAFETY PRECAUTIONS •

(Always read these instructions before using this equipment.)

Before using this product, please read this manual and the relevant manuals introduced in this manual

carefully and pay full attention to safety to handle the product correctly.

The instructions given in this manual are concerned with this product. For the safety instructions of the

programmable controller system, please read the user's manual of the CPU module to use.

In this manual, the safety instructions are ranked as "DANGER" and "CAUTION".

DANGER

CAUTION

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.

Note that the

CAUTION level may lead to a serious consequence according to the circumstances.

Always follow the instructions of both levels because they are important to personal safety.

Please save this manual to make it accessible when required and always forward it to the end user.

[Design Instructions]

DANGER

•

See manuals of each data link for the operating status of each station when there is a

communication error in the data link.

There is the risk of an accident occurring due to output error or malfunctioning.

•

When using the notification function, the pager receiver may not be contacted due to the frequency

transmission status from the system setup environment and error on the receiver side.

To ensure the safety of the PLC system, install a call circuit with a lamp display or buzzer sound.

•

When performing the control of the PLC in operation (changing data) by connecting a peripheral

devices to the CPU module or personal computer, etc. to the intelligent device module, configure an

interlock circuit in a sequence program so the safety of the overall system is always maintained.

Also when performing other controls of the PLC in operation (changing program and operation

status (status control)), read this manual carefully and confirm if the overall safety is maintained.

Especially, when this control is performed to a remote PLC from an external device, troubles

that have occurred on the PLC side may not be able to immediately be handled if there is a data

communication error.

Define a troubleshooting agreement between external devices and the PLC CPU for data

communication error occurrences, as well as construct an interlock circuit in the sequence program.

•

Do not write data into the "system area" of the buffer memory of intelligent function modules.

Also, do not use any "prohibited to use" signals as an output signal to an intelligent function

module from the PLC CPU.

Writing data into the "system area" or outputting a signal for "prohibited to use" may cause a

PLC system malfunction.

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Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 3

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