BECKHOFF DK9222-1109-0015 - Manual (Page 7)

I/O
Wireless Automation
Application Note DK9222-1109-0015
Attenuation in practice
With​an​attenuation​of​6​dB​the​range​is​shortened​to​half​of​the​value​for​an​unobstructed​connection,​with​12​dB​it​is​
shortened​to​a​quarter.​Maximum​ranges​can​only​be​achieved​through​the​careful​selection​of​antenna​combinations,​whereby​
the​given​ranges​are​subject​to​the​standard​conditions​(free​sight​and​maintenance​of​the​Fresnel​zone).
​
Thin wall
Wooden wall
Masonry wall
Concrete wall
Concrete ceiling
2-5 dB
5 dB
6-12 dB
10-20 dB
20 dB
Material Attenuation
Tab. 1 Expected attenuation for obstructing materials
. Radio links
.1 Antennas
The​various​radio​antennas​are​connected​directly​to​the​KM6551​or​the​CU8890​respectively​via​the​reverse​SMA​plug​
(Straight​Medium​Adapter).​You​can​adapt​to​the​environment​by​the​free​selection​of​an​antenna;​the​free‑field​distance​
between​two​KM6551​units​or​two​CU8890​units​can​be​up​to​300​m​in​PTP​mode.​The​following​antennas​are​available​for​
establishing​the​most​diverse​topologies:
A​ Directional​antennas​(suitable​for​PTP​without​rotation​and​wide​distances)
B​ Rod​antennas​(suitable​for​PTP​with​rotation​and​enable​good​control​cabinet​mounting)
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