BECKHOFF DK9222-1109-0015 - Manual (Page 5)

I/O
Wireless Automation
Application Note DK9222-1109-0015
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2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 2467 2472
1 2 3 4 5 6 7 8 9 10 11
2402 2407
Channel:
MHz
Fig. Overlapping of WLAN channels – only 1, 6 and 11 are possible in parallel
If​radio​systems​with​the​same​frequency​are​operated​at​the​same​time​and​in​the​same​place,​interference​can​occur.​In​
order​to​prevent​this,​most​systems​have​several​separate​transmission​channels​(e.g.​WLAN​and​IEEE​802.15.4),​so​that​the​
user​can​operate​the​systems​in​parallel.​The​eleven​WLAN​radio​channels​are​arranged​in​an​overlapping​manner.​Therefore,​
only​channels​1,​6​and​11​can​be​operated​independently​in​parallel​(see​fig.​3).​Corresponding​free​frequency​ranges​are​then​
available​for​the​channels​of​the​KM6551,​so​that​both​can​be​operated​in​parallel.​In​the​following​example​(fig.​4),​CU8890​
WLAN​Controllers​with​eleven​channels​transmit​in​the​same​range​as​KM6551​units​with​16​channels.​The​channels​can​be​
freely​set​in​both​the​CU8890​and​the​KM6551,​allowing​several​systems​to​be​operated​simultaneously.
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2400 2483,5
2405 2410 2415 2420 2425 2430 2435 2440 2445 2450 2455 2460 2465 2470 2475 2480
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
2400 MHz
2412 MHz 2437 MHz 2462 MHz
22 MHz
CU8890
(WLAN)
KM6551
(IEEE 802.15.4)
2
Frequency in MHz
Channels
Channel 1 Channel 6 Channel 11
Fig. Parallel operation of WLAN (CU8890) and IEEE 802.15. (KM6551)
New Automation Technology Beckhoff 5
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