Industrial Communications Handbook August 2016

for the coexistence management, or the use of several frequency groups (RF bands) to optimise the parallel operation.

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.

7.2.3 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

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.

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industrial communications handbook 2016