The CRT screen can be distorted by magnetic interference.
Arranging magnetic sources must be done with care.
If magnetic sources (such as transformers, fan motors,
electromagnetic contactors, solenoids, and relays) are located near the
CRT display, they frequently distort the display screen. To prevent
this, the CRT display and the magnetic sources generally must be kept
300 mm apart. If the CRT display and the magnetic sources are not
300 mm apart, the screen distortion may be suppressed by changing
the direction in which the magnetic sources are installed.
The magnetic intensity is not constant, and it is often increased by
magnetic interference from multiple magnetic sources interacting
with each other. As a result, simply keeping the CRT and the magnetic
sources 300 mm apart may not be enough to prevent the distortion.
If they cannot be kept apart, or if the CRT screen remains distorted
despite the distance, cover the screen with a magnetic shield.
The installation conditions of the I/O unit must be satisfied.
To obtain good ventilation in the module, the I/O unit must be installed
in the direction shown in the following figure. Clearances of 100 mm
or more both above and below the I/O unit are required for wiring and
Equipment radiating too much heat must not be put below the I/O unit.
I/O base unit
(No screws or protrusions shall
extend from the bottom of this