Mitsubishi MELSEC-A A2USHCPU-S1 User Manual page 5

[DESIGN PRECAUTIONS]
Do not install the control lines or communication cables together with the main circuit or power lines,
or bring them close to each other.
Keep a distance of 100mm (3.94inch) or more between them.
Failure to do so may cause malfunctions due to noise.
When an output module is used to control the lamp load, heater, solenoid valve, etc., a large current
(ten times larger than the normal one) may flow at the time that the output status changes from OFF
to ON. Take some preventive measures such as replacing the output module with the one of a
suitable current rating.
[INSTALLATION PRECAUTIONS]
Use the PLC under the environment specified in the user's manual.
Otherwise, it may cause electric shocks, fires, malfunctions, product deterioration or damage.
Insert the module fixing projection into the fixing hole in the base unit and then tighten the module
mounting screw within the specified torque.
When no screw is tightened, even if the module is installed correctly, it may cause malfunctions, a
failure or a drop of the module.
If too tight, it may damage the screw and/or the module, resulting in a drop of the module, a short
circuit or malfunctions.
Connect the extension cable to the connector of the base unit or module.
Check the cable for incomplete connection after connecting it.
Poor electrical contact may cause incorrect inputs and/or outputs.
Insert the memory cassette and fully press it to the memory cassette connector.
Check for incomplete connection after installing it.
Poor electrical contact may cause malfunctions.
Be sure to shut off all phases of the external power supply used by the system before mounting or
removing the module.
Failure to do so may damage the module.
Do not directly touch the conductive part or electronic components of the module.
Doing so may cause malfunctions or a failure of the module.
CAUTION
CAUTION
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