Vega WHA-GW-WIRELESSHART GATEWAY Bedienungsanleitung PDF herunterladen (Seite 82)

221981 2011-07

WHA-GW-*

Operation

Figure 6.14Eliminating a bottleneck

Expand the Network

In an industrial environment, there are several potential obstacles for radio waves, for

example buildings, walls, pipes, or even moving obstacles like trucks. Those obstacles can

reflect, bend, diffuse or block radio waves. The effects of reflection, bending and diffusion

create new waves which interact with the original ones and with each other. They can

amplify or nullify each other.

Due to the interference of reflections, moving the antenna a few centimetres can help. If

there are obstacles blocking transmission between wireless devices, add additional

devices to provide alternative communication paths. The more devices exist in a

WirelessHART network, the more reliable it gets.

Optimize Coexistence with other Wireless Networks

WirelessHART networks use the frequency spectrum between 2400 ... 2483.5 MHz

according to IEEE 802.15.4. Various other wireless technologies also use this frequency

spectrum, for example WLAN (IEEE 802.11) and Bluetooth (IEEE 802.15.1). Measures

must be taken to ensure that the various wireless technologies do not affect each other.

1 Bottleneck

2 WirelessHART Gateway

3 Possible position of an additional WirelessHART device eliminating the bottleneck

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Vega WHA-GW-WIRELESSHART GATEWAY Bedienungsanleitung Seite 82