Safety Precautions - Mitsubishi Electric MELSEC-Q Series User Manual

Before using this product, please read this manual carefully and pay full attention to safety to handle the
product correctly.
The precautions given in this manual are concerned with this product only.
For the safety precautions of the programmable controller system, refer to the user's manual for the CPU
module used.
In this manual, the safety precautions are classified into two levels: "
WARNING
!
CAUTION
!
Under some circumstances, failure to observe the precautions given under "
serious consequences.
Observe the precautions of both levels because they are important for personal and system safety.
Make sure that the end users read this manual and then keep the manual in a safe place for future
reference.
[Design Precautions]
 Do not write any data to the "system area" and "write-protect area" of the buffer memory in the
intelligent function module.
Also, do not use any "use prohibited" signals as input or output signals from the intelligent
function module to the CPU module.
Doing so may cause malfunction of the programmable controller system.
 Due to failure of the output element or internal circuit, normal output may not be obtained
correctly. Configure an external circuit for monitoring output signals that could cause a serious
accident.
 Do not install the control lines or communication cables together with the main circuit lines or
power cables.
Keep a distance of 100mm or more between them.
Failure to do so may result in malfunction due to noise.
 At power-on or power-off, a current may flow between output terminals momentarily.
In this case, start the control after analog outputs become stable.
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 SAFETY PRECAUTIONS 
(Read these precautions before using this product.)
Indicates that incorrect handling may cause hazardous conditions,
resulting in death or severe injury.
Indicates that incorrect handling may cause hazardous conditions,
resulting in minor or moderate injury or property damage.
!
CAUTION
!
!
WARNING
WARNING" and "
!
CAUTION" may lead to
!
CAUTION".
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