Mitsubishi Q2ACPU, User Manual

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[DESIGN PRECAUTIONS]
[INSTALLATION PRECAUTIONS]
CAUTION
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.
If having read register R outside the allowable range with the MOV instruction, the file register data
will be FFFF
H
. Using this as it is may cause malfunctions. Pay attention not to use any out-of-range
file register when designing sequence programs. For instruction details, refer to the programming
manual.
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 module with the one of a suitable
current rating.
Time from when the CPU module is powered on or is reset to when it enters in RUN status depends
on the system configuration, parameter settings, and program size.
Design the program so that the entire system will always operate safely, regardless of the time.
CAUTION
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 to mount the module.
Incorrect mounting may cause malfunctions, a failure or a drop of the module.
In an environment of frequent vibrations, secure the module with the screw.
Tighten the screw within the specified torque range.
If the screw is too loose, it may cause a drop of the module, a short circuit or malfunctions.
Tightening the screw excessively 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 for incomplete connection after installing it.
Poor electrical contact may cause incorrect inputs and/or outputs.
Insert the memory card and fully press it to the memory card 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.