Safety Precautions - Mitsubishi MELSEC-Q Series User Manual

Before using this product, read through this manual and the relevant ones introduced in this manual to
handle the product correctly and safely.
The following instructions are limited to the CC-Link/LT master module only. For safety precautions on
the programmable controller system, refer to the user's manual of the CPU module to be used.
In this manual, the levels of hazardous situations are shown as follows:
!
DANGER
CAUTION
!
Note that even a CAUTION leveled situation may lead to a serious consequence. Be sure to follow
!
the instructions of both levels.
Keep this manual in a handy place and make sure to deliver this to the end user.
[Design Precautions]
• When the data link communication is faulty, refer to Chapter 6 of this manual for operating states
of each station.
• When connecting peripheral devices to the CPU module, create interlock circuits in the
sequence programs so that the safety of the whole system will be ensured.
Before modifying programs, changing operating status (status control) or conducting other
controls with the programmable controller running, thoroughly read the relevant manuals and
confirm the safety. Especially when instructing these controls from external devices to a remote
programmable controller, problems arisen on the programmable controller may not be solved
immediately due to abnormal data communications.
To prevent this, create interlock circuits in the sequence programs and set the corrective
measures between the external devices and the programmable controller CPU in case of
abnormal data communication.
• Do not write data to "Prohibited area" of the buffer memory.
Doing so may lead to malfunction of the programmable controller system.
• Do not bring the control wires and communication cables close to the main circuit or power
wires.
Keep a distance of at least 100mm between them.
Failure to do so may cause malfunctions due to noise.
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• SAFETY PRECAUTIONS •
(Be sure to read before use)
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.
DANGER
!
CAUTION
!
A - 1