105
Installation Precautions Section 4-2
If the I/O wiring and power cables must be placed in the same duct, they must
be shielded from each other using grounded steel sheet metal.
Improving Noise
Resistance
Reduce the effects of noise by observing the following points.
• Do not mount the PC in a control panel containing high-voltage equip-
ment.
• Install the PC at least 200 mm (6.5 feet) from power lines.
• Ground the mounting plate between the PC and the mounting surface.
PC Orientation When installing the CQM1H in the control panel, always mount the Units so
that the ventilation openings are facing up. Also, there must be at least a 20-
mm space both above and below the PC.
Steel sheet metal
200 mm min.
Ground to 100 Ω or less
Power lines
PC power supply
and general
control wiring
PC I/O wiring
CQM1H
200 mm min.
200 mm min.
Power lines
Correct
Wrong
Wrong
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