Help with configuring a Wi-Fi network: Siemens

oubaxms Posted messages 8 Status Member -  
phil2k Posted messages 10841 Registration date   Status Contributor Last intervention   -
Hello everyone,

This is my first project in configuring a WiFi network, I need your help to make the network functional:

1) The network consists of three WiFi antennas, each linked to a Siemens SCALANCE W788-2RR module. Then, a SCALANCE X204-2 switch groups the three APs (Antennas).

2) I also have 6 clients moving around the coverage area.

The equipment is already installed, but clients are experiencing communication issues (Signal, Disconnection...) when changing locations.

What are your suggestions to allow clients to connect better within the coverage areas?

Thank you for any information

Configuration: Windows 7 / Chrome 51.0.2704.103

4 answers

Pierre1310 Posted messages 8854 Status Member 652
 
Hi,

Wifi repeater?
Have you checked the issues yourself?
Because anyway, three-quarters of the time the client is talking nonsense.
So for the signal strength, I gave you a tip, then you have to see if there are enough available IP addresses on your local network (I assume it is one since the three modules are on a switch).

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oubaxms Posted messages 8 Status Member
 
Thank you Pierre,

I will leave the repeater solution as the last step, I think the correct software configuration will be the first step, right? Like IP address, channel...
Currently, all the APs are on:
2.4Ghz, Channel 8

You mentioned it could be a switch problem, I mean that the clients are connected when they are stationary.
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Pierre1310 Posted messages 8854 Status Member 652
 
But what are they connected with? Via the Wi-Fi network or using an RJ45 cable?

I don't think the problem comes from the switch, but rather from the strength of the signal at first, it's one of the main causes of "Wi-Fi not working".
Then, as I mentioned towards the end, the range of available IP addresses needs to be configured.

Normally, on your modules, you have 2 IP addresses.
The first one is the local network between the 3 modules and the second one comes from the Wi-Fi.
So, in theory, you have a gateway.

And you didn't say what your clients were doing with the Wi-Fi x).
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oubaxms Posted messages 8 Status Member
 


Network architecture
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Pierre1310 Posted messages 8854 Status Member 652
 
So according to your image, you have 2 very different Wi-Fi networks, right?

I confess that I don't know if the Wi-Fi access points are for broadcasting or receiving, enlighten me x).

But you didn't tell me what your clients do with the Wi-Fi. Do they consult the HMI, the data from the automata?
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oubaxms Posted messages 8 Status Member
 
A Wifi network and another network

Yes, that's it, the clients consult the UI and send commands to each other.

I didn't understand your question about the access points (Broadcast or reception)?
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Pierre1310 Posted messages 8854 Status Member 652
 
You have 3 Wi-Fi transmitters on the fiber. And each device also has its own transmitter.
So if I understand correctly, clients connect only to the fiber network via the 3 Wi-Fi access points?

If so, as I told you, have you checked with them about the issues? Because a problem is one thing, but what kind of problem? @ip, signal, not enough addresses, etc.
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oubaxms Posted messages 8 Status Member
 
Only two clients have S7-300 controllers, the remaining 4 clients are SIMATIC HMI.

The 6 clients (2 S7-300 controllers and 4 SIMATIC HMI) are connected via (PB LINK PROFIBUS/WIFI CONVERTER).
PB link siemens
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Pierre1310 Posted messages 8854 Status Member 652
 
So we agree that the client is sticking with the yellow/green?
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phil2k Posted messages 10841 Registration date   Status Contributor Last intervention   2 339
 
Hello

According to the description you provide of the issue, there is likely a coverage problem.
It would be necessary to review the locations of the antennas, and possibly add another one to ensure better coverage of the area.

--
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oubaxms Posted messages 8 Status Member
 
Hello Phil2k,
Thank you also for the remark
What I found using a "Wifi Analyzer" app on my phone is that all antennas operate on:
2.4 GHz and Channel 8.
While searching online:

Standard Mode
The simplest mode and often very effective.
We need several wifi access points. All access points are connected with an RJ-45 cable to the router.
It is possible to keep the Wifi from the ISP's Box.
Each access point has its IP address, its wifi network name which is different from the others and especially which is configured on a different channel. 1 or 6 or 11 if you are on 2.4 GHz with 20 MHz bands. If you have 40 MHz, you must also choose 1 or 6 or 11 as a base and then leave the upper side band or lower side band selected by the access point. Be careful to avoid overlaps.
If you are on 5 GHz, choose a free channel, there are many and it starts at 36.
Wifi clients must then connect to each SSID one by one and each time enter the password for each SSID network.
Reliable, effective, but a bit long because each client needs to be configured one by one on each SSID.

One variation is to keep the same SSID on all access points BUT each access point must be configured on a different channel.

https://lafibre.info/wifi/wifi-mode-standard-repeater-ou-wds/
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phil2k Posted messages 10841 Registration date   Status Contributor Last intervention   2 339
 
What you indicate here concerns personal networks.

In an industrial environment, the settings must be configured so that roaming works correctly.
Therefore, there is no question of changing the IP address when moving from one antenna to another.

It is in your equipment documentation that you need to find the optimal configurations.
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phil2k Posted messages 10841 Registration date   Status Contributor Last intervention   2 339
 
Look at this doc:

https://buy.wesco.com/content/automation
starting with pages 15-16

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There are 3 kinds of people: those who can count and those who cannot.
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