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industrial communications handbook 2016
for the coexistence management, or the use of several
frequency groups (RF bands) to optimise the parallel
operation.
7.2.3 Fading
Both DSSS and FHSS combat Fading by the simple expe-
dient that the path length between the direct signal and
the reflected signal are different at different frequencies.
FHSS shows this fading margin more strongly as it is
unlikely that a catastrophic loss of communication will
be repeated at the next random frequency. DSSS has a
bundle of frequencies, hence a softer, less catastrophic
fading. Thus, although DSSS technically sounds better at
handling fading, in practice, a decent FHSS kills DSSS.
7.3 Industrial network market share
Industrial Ethernet is growing faster than before [7] and
now accounts for 38% of the market. EtherNet/IP is in
first place within industrial Ethernet globally, followed
by PROFINET. However, classic fieldbuses are still
dominating the fragmented world of industrial networks
with 58% and PROFIBUS is still the most widely used
industrial network. Furthermore, the Internet of Things
is driving wireless technologies, which are now on the
chart for the first time as shown in
Figure 7.1
.
Some of the trends highlighted by HMS (in
Fig-
ure 7.1
) are:
Fieldbus is still growing
: Looking at new installed
nodes within factory automation globally, fieldbuses are
still the most widely used type of networks with 58%
of the market. Fieldbuses are still growing by approxi-
mately 7% per year as users ask for simplicity, tradition
and reliability.
Industrial Ethernet is growing faster than be-
fore:
And taking more market share. At a growth rate of
20%, Ethernet now makes up for 38% of the global mar-
ket compared to 34% in 2015. EtherNet/IP is the number
one Ethernet network with 9% followed by PROFINET
(8%). Runners-up are EtherCAT, Modbus-TCP and Eth-
ernet POWERLINK.
Wireless is coming:
For the first time, wireless
technologies are on the chart with 4% of the worldwide
industrial network market. WLAN is most popular, fol-
lowed by Bluetooth.
The Internet of Things is a big driver for wireless
technologies, opening up new automation architectures
and is increasingly being considered for machine con-
nectivity and control, including Bring Your Own Device
(BYOD) solutions via tablets or smart-
phones.
7.3.1 Regional breakdown
In Europe and the Middle East, PROFI-
BUS is the leading network while PROFI-
NET has the fastest growth rate. Runners-
up are EtherCAT, Modbus-TCP and POW-
ERLINK. The US market is dominated by
the CIP networks where EtherNet/IP is
overtaking DeviceNet in terms of market
shares. In Asia, no network stands out as
truly market-leading—PROFIBUS, PRO-
FINET, Ethernet/IP, Modbus and CC-Link
are widely used. EtherCAT continues to
establish itself as a significant network,
and there are early signs of CC-Link IE
Field being adopted.
Figure 7.1: 2016 Industrial Networking market share according to HMS.