Mitsubishi Electric MELSEC-QS Series Safety Application Manual page 6

[Installation Precautions]
Use a safety programmable controller in the environment that meets the general specifications
described in the QSCPU User's Manual (Hardware Design, Maintenance and Inspection).
Using this programmable controller in an environment outside the range of the general specifications
could result in electric shock, fire, erroneous operation, and damage to or deterioration of the
product.
While pressing the installation lever located at the bottom of module, insert the module fixing tab into
the fixing hole in the base unit until it stops. Then, securely mount the module with the fixing hole as
a supporting point.
Incorrect loading of the module can cause a failure or drop.
Secure the module to the base unit with screws.
Tighten the screw in the specified torque range.
If the screws are too loose, it may cause a drop of the screw or module.
Overtightening may cause a drop due to the damage of the screw or module.
Make sure to fix the CC-Link Safety remote I/O module with a DIN rail or fixing screws and tighten
the screws with the specified torque.
If the screws are too loose, it may cause a drop of the screw or module.
Overtightening may cause a drop due to the damage of the screw or module.
Completely turn off the external supply power used in the system before mounting or removing the
module.
Not doing so could result in damage to the product.
Do not directly touch the module's conductive parts or electronic components.
Doing so may cause malfunctions or a failure.
[Wiring Precautions]
Be sure to shut off all phases of the external supply power used by the system before wiring.
Not completely turning off all power could result in electric shock or damage to the product.
When energizing or operating the module after installation or wiring, be sure to close the attached
terminal cover.
Not doing so may result in electric shock.
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CAUTION
WARNING