Siemens SIMATIC ET 200AL, System Manual

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Description
2.2 Setting up PROFINET
PROFINET with STEP 7
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Function Manual, 05/2021, A5E03444486-AL
Range
With SCALANCE W (access points), wireless networks can be set up indoors and outdoors.
Multiple access points can be installed to create large wireless networks in which mobile
subscribers are transferred seamlessly from one access point to another (roaming).
As an alternative to a wireless network, point-to-point connections of Industrial Ethernet
segments can also be set up over large distances (several hundred meters). In this case, the
range and characteristics of the RF field are determined by the antennas used.
Note
Range
The range can be considerably less, depending on spatial factors, the wireless standard used,
the data rate, and the antennas on the send and receive sides.
2.2.3.2 Tips on assembly
Wireless networks, SCALANCE device family
With PROFINET, you can also set up wireless networks with Industrial Wireless Local Area
Network (IWLAN) technology. We recommend implementing the SCALANCE W device line for
this.
Update time in STEP 7
If you set up PROFINET with Industrial Wireless LAN, you may have to increase the update
time for the wireless devices. The IWLAN interface provides lower performance than the
wired data network: Several communication stations have to share the limited transmission
bandwidth. For wired solutions, 100 Mbps is available for each communication device.
The Update time parameter can be found in the "Realtime settings" section in the Inspector
window of IO devices in STEP 7.
Figure 2-10 Update time in STEP 7