Specifications

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Because of this variability, industrial control devices are either
sold entirely separately from their power supply or are available
with a choice of power supplies. Unlike ordinary networking devices,
industrial controls require you to choose the correct power supply
for both device and application.
Industrial power supplies must be matched to both the type of
power input they’ll be receiving from the power grid and the power
output they’ll be expected to provide to the industrial control device.
Although power input is often ordinary 230VAC standard
European power, but industrial power supplies may be expected to
accept AC power that ranges lower or higher may be single-phase or
three-phase. DC power may also be available and may include
24VDCc and 48VDC.
Many industrial power supplies offer a universal input that will
accept power across a wide range, typically 85 – 264 VAC, and
120–370 VDC. This not only makes them adaptable to many different
power sources, but provides them with the resilience to withstand
large fluctuations in power input while still providing stable, reliable
power output.
On the output side, industrial power generally supplies 12 VDC,
24 VDC, or 48 VDC power to the device side. Most industrial control
devices in North America and Europe take 24-VDC power.
Industrial power supplies typically have screw or spring-clamp
terminal blocks for power connections.
EMI protection
Industrial areas are also prone to electromagnetic interference
(EMI) and radio-frequency interference (RFI). Interference and noise
from EMI/RFI creates unwanted signals that may interfere with
network performance.
Devices for industrial applications are usually built to withstand
higher EMI than those intended for office or data center use. Chassis
are usually shielded, and EMI signals can be absorbed by using
capacitor-based circuits or through special coatings as well.
Mounting
Components for office or data center use are usually either
freestanding or mounted on 19” rails in a cabinet or rack. Industrial
devices, on the other hand, are usually panel mounted by bolting
them to a flat surface, or they may be DIN rail mounted.
DIN rail is an industry-standard metal rail that is used both
wallmounted or rackmounted. Industrial devices mount directly on
the rail or may come with separate DIN rail brackets. For more about
DIN rail, see page 5.
NEMA ratings for cabinetsm
Enclosures designed to protect components against contaminants
are a way to safeguard industrial devices. These enclosures are usually
NEMA rated to describe the amount of protection they provide.
There are many numerical NEMA designations, but the most
relevant ones are NEMA 3, NEMA 3R, NEMA 4, NEMA 4X,
and NEMA 12.
NEMA 3 enclosures, designed for both indoor and outdoor use,
provide protection against falling dirt, windblown dust, rain, sleet,
and snow, as well as ice formation.
The NEMA 3R rating is identical to NEMA 3 except that it doesn’t
specify protection against windblown dust.
NEMA 4 and 4X enclosures, also designed for indoor and outdoor
use, protect against windblown dust and rain, splashing and
hose-directed water, and ice formation. NEMA 4X goes further
than NEMA 4, specifying that the enclosure will also protect
against corrosion caused by the elements.
NEMA 12 enclosures are constructed for indoor use only and
are designed to provide protection against falling dirt; circulating
dust, lint, and fibers; and dripping or splashing noncorrosive liquids.
Protection against oil and coolant is also a prerequisite for NEMA
12 designation.
NEMA ratings for cabinets