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The instructions given in this manual are concerned with this product only. For the safety instructions of
the programmable controller system, please read the user's manual for the CPU module to use.
In this manual, the safety precautions 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 serious consequence according to the circumstances.
Always follow the instructions of both levels because they are important to personal safety.

Please store this manual in a safe place and make it accessible when required. Always forward it to the end user.

[DESIGN PRECAUTIONS]
!
DANGER
• Refer to Section 6.2.7 of this manual for information about the operation of each node when the
cyclic transmission generates a communication error when using FL-net (OPCN-2). The wrong
output or erroneous operation could result in an accident.
• Never write data to the "system area" of the buffer memory for the intelligent function unit buffer
memory. In addition, never output (set to on) the "use prohibited" signal during an output signal
from the programmable controller CPU to the intelligent function unit. Writing data to the
"system area" or output of a "use prohibited" signal could result in the malfunction of the
sequence system.