<![CDATA[Ewon Technical Forum

<![CDATA[Ewon Technical Forum - Portal]]> https://techforum.ewon.biz/ Tue, 28 Jul 2026 18:24:39 +0000 MyBB <![CDATA[Connecting Flexy 205 to KepsServer OPCUA Server]]> https://techforum.ewon.biz/thread-2871.html Tue, 28 Jul 2026 17:52:02 +0000 JimRoberts]]> https://techforum.ewon.biz/thread-2871.html
Since I know you will ask, here is basically what I did.
1) I set KEPServer to allow OPCUA communcations.
2) Using KepServer OPC UA Configuration Manager, I found the Server Endpoints for the KEPServer server. I chose the local machine address version (127.0.0.1:49370).
3) I used Matrikon OPC UA Explorer as a client to test the communications. It came right up and linked to the server. Easy as pie.
4) I created OPCUA Topic A pointing in the Flexy with the local machine path opc.tcp://127.0.0.1:49370. Matched the available security policy as Basic256sha256 and using Sign and Encrypt, just like with the Matrikon.
5) Updated the IO Server configuration.
6) Went to Windows Firewall and opened up port 49370.
7) Went to KS OPC Configuration Manager and found the eWONOpcUaCLient in the Trusted Clients list and I must have imported it. Anyway, when I view the certificate, the Certification Path says "This Certificate is OK."
8) In the Flexy OPCUA IO server certificate manager, I did not see the KEPServer cert, so I went back to KS OPC CM and in the Instance Certificate tab, exported a server certificate.
9) back in the Flexy Certificate Manager, I clicked the PLUS button and found the KS cert and uploaded it. It now shows as an Auth certificate.
10) BTW, I reinitialized the KEPServer Runtime engine multiple times while doing this.
11) Go to Tags/Values/Add, throw in a tag name, set the Server Name to OPCUA Topic A. Click in address filed, chose OPCUA Node (there is a blue question mark and the word Node to the right of the actual label).
12) The Select Node dialog box opens with a one level tree and the level descriptor says "OPCUA Server not ready."

Any help is appreciated at this point.

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Since I know you will ask, here is basically what I did.
1) I set KEPServer to allow OPCUA communcations.
2) Using KepServer OPC UA Configuration Manager, I found the Server Endpoints for the KEPServer server. I chose the local machine address version (127.0.0.1:49370).
3) I used Matrikon OPC UA Explorer as a client to test the communications. It came right up and linked to the server. Easy as pie.
4) I created OPCUA Topic A pointing in the Flexy with the local machine path opc.tcp://127.0.0.1:49370. Matched the available security policy as Basic256sha256 and using Sign and Encrypt, just like with the Matrikon.
5) Updated the IO Server configuration.
6) Went to Windows Firewall and opened up port 49370.
7) Went to KS OPC Configuration Manager and found the eWONOpcUaCLient in the Trusted Clients list and I must have imported it. Anyway, when I view the certificate, the Certification Path says "This Certificate is OK."
8) In the Flexy OPCUA IO server certificate manager, I did not see the KEPServer cert, so I went back to KS OPC CM and in the Instance Certificate tab, exported a server certificate.
9) back in the Flexy Certificate Manager, I clicked the PLUS button and found the KS cert and uploaded it. It now shows as an Auth certificate.
10) BTW, I reinitialized the KEPServer Runtime engine multiple times while doing this.
11) Go to Tags/Values/Add, throw in a tag name, set the Server Name to OPCUA Topic A. Click in address filed, chose OPCUA Node (there is a blue question mark and the word Node to the right of the actual label).
12) The Select Node dialog box opens with a one level tree and the level descriptor says "OPCUA Server not ready."

Any help is appreciated at this point.

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Picture 2.png (Size: 90,73 KB / Downloads: 0) ]]> <![CDATA[Visibility on interval]]> https://techforum.ewon.biz/thread-2870.html Wed, 08 Jul 2026 09:24:35 +0000 mbabilon]]> https://techforum.ewon.biz/thread-2870.html

I created a visualization with multiple graphics that are shown or hidden depending on a value.
In the simulation, the visibility works perfectly:

Value 1 → first symbol visible, all others hidden
Value 2 → second symbol visible, all others hidden
Value 3 → third symbol visible, all others hidden

However, in real operation, no symbol is visible when the value is 2.

Can someone help me?]]>

I created a visualization with multiple graphics that are shown or hidden depending on a value.
In the simulation, the visibility works perfectly:

Value 1 → first symbol visible, all others hidden
Value 2 → second symbol visible, all others hidden
Value 3 → third symbol visible, all others hidden

However, in real operation, no symbol is visible when the value is 2.

Can someone help me?]]> <![CDATA[HMI Access using M2Web over VNC]]> https://techforum.ewon.biz/thread-2868.html Wed, 03 Jun 2026 21:59:17 +0000 mitesh.maniar]]> https://techforum.ewon.biz/thread-2868.html
https://elearning.hms-networks.com/m2web...te-devices

As per link we can make HMI visible in m2web using VNC on port 5900. i have a question if accessing this way consumes data ? i have observed that after setting up that data consumption has increased too much and not clear how m2web setup work and how it make HMI visible in m2web ?

can anyone please provide some feedback ?

thanks,
Mitesh Maniar]]>
https://elearning.hms-networks.com/m2web...te-devices

As per link we can make HMI visible in m2web using VNC on port 5900. i have a question if accessing this way consumes data ? i have observed that after setting up that data consumption has increased too much and not clear how m2web setup work and how it make HMI visible in m2web ?

can anyone please provide some feedback ?

thanks,
Mitesh Maniar]]> <![CDATA[Flexy 205 firmware 15.0s2 downgrade to 14.x]]> https://techforum.ewon.biz/thread-2867.html Thu, 28 May 2026 07:40:19 +0000 SECA]]> https://techforum.ewon.biz/thread-2867.html Malgré toutes nos tentatives, y compris avec un ebuddy plus ancien qui accorde la possibilité de faire une "Recuperation d'Ewon", nous n'arrivons pas a downgrader un flexy 205 en firmware 15.0s2 vers la version 14.
Es-ce possible?
Si oui quel est la procédure?]]> Malgré toutes nos tentatives, y compris avec un ebuddy plus ancien qui accorde la possibilité de faire une "Recuperation d'Ewon", nous n'arrivons pas a downgrader un flexy 205 en firmware 15.0s2 vers la version 14.
Es-ce possible?
Si oui quel est la procédure?]]> <![CDATA[Datamailbox data loss on power cut]]> https://techforum.ewon.biz/thread-2866.html Wed, 27 May 2026 06:13:15 +0000 heyjay]]> https://techforum.ewon.biz/thread-2866.html
I'm using an ewon flexy 205 with historical logging and I configured datamailbox for our IOT application.

I discovered recently that I'm missing sometimes data.
After some investigations, I pointed the problem out. This happens when flexy loses Internet connection before a power cut. All data not sent between the Internet disconnection and the power cut are lost. If the module loses internet but reconnects before a power cut, then I don't lose any data.

So it seems the buffer is flushed when flexy is powered down or the datamailbox engine is not totally reliable.

In the same time, I'm using a MQTT BASIC script for another IOT application and I don't have the problem, all data are retrieved when ewon restarts and is connected back to Internet.

Does anyone can confirm if it's a known issue with datamailbox?

Thanks a lot]]>
I'm using an ewon flexy 205 with historical logging and I configured datamailbox for our IOT application.

I discovered recently that I'm missing sometimes data.
After some investigations, I pointed the problem out. This happens when flexy loses Internet connection before a power cut. All data not sent between the Internet disconnection and the power cut are lost. If the module loses internet but reconnects before a power cut, then I don't lose any data.

So it seems the buffer is flushed when flexy is powered down or the datamailbox engine is not totally reliable.

In the same time, I'm using a MQTT BASIC script for another IOT application and I don't have the problem, all data are retrieved when ewon restarts and is connected back to Internet.

Does anyone can confirm if it's a known issue with datamailbox?

Thanks a lot]]> <![CDATA[OPEN EBD file config.txt in text mode error]]> https://techforum.ewon.biz/thread-2865.html Mon, 18 May 2026 11:04:12 +0000 mickaa]]> https://techforum.ewon.biz/thread-2865.html
When i open a file config.txt with EBD in binary mode, i don't have error,

Code:
OPEN "exp:$dtCF $ftB" FOR BINARY INPUT AS 1

$ReadNext:

IF EOF $FileNumber% THEN GOTO $ReadDone ENDIF

$Char$=GET 1,1

print $Char$

Console: Read binary file ok

but, when i open a file config.txt with EBD in TEXT mode: i obtain this error: why?

Code:
OPEN "exp:$dtCF $ftT" FOR TEXT INPUT AS 1

$ReadNext:

IF EOF $FileNumber% THEN GOTO $ReadDone ENDIF

$Char$=GET 1,1

print $Char$

Console: Read text file ok

But if i read a many caractere at the same time, it work!

Code:
OPEN "exp:$dtCF $ftT" FOR TEXT INPUT AS 1

$ReadNext:

IF EOF $FileNumber% THEN GOTO $ReadDone ENDIF

$DATA$=GET 1,2048

print $DATA$

Console: Read DATA file OK

]]>
When i open a file config.txt with EBD in binary mode, i don't have error,

Code:
OPEN "exp:$dtCF $ftB" FOR BINARY INPUT AS 1

$ReadNext:

IF EOF $FileNumber% THEN GOTO $ReadDone ENDIF

$Char$=GET 1,1

print $Char$

Console: Read binary file ok

but, when i open a file config.txt with EBD in TEXT mode: i obtain this error: why?

Code:
OPEN "exp:$dtCF $ftT" FOR TEXT INPUT AS 1

$ReadNext:

IF EOF $FileNumber% THEN GOTO $ReadDone ENDIF

$Char$=GET 1,1

print $Char$

Console: Read text file ok

But if i read a many caractere at the same time, it work!

Code:
OPEN "exp:$dtCF $ftT" FOR TEXT INPUT AS 1

$ReadNext:

IF EOF $FileNumber% THEN GOTO $ReadDone ENDIF

$DATA$=GET 1,2048

print $DATA$

Console: Read DATA file OK

]]> <![CDATA[Can't downgrade from v15.0s2 to V14]]> https://techforum.ewon.biz/thread-2864.html Thu, 07 May 2026 11:22:38 +0000 FlamcoDaan]]> https://techforum.ewon.biz/thread-2864.html
I'm trying to downgrade an Ewon Flexy205 15.0s2 to V14

I've searched the forum and it says I need to use Ewon Recovery (F7) in eBuddy.

But in eBuddy my Ewon Recovery is grayed out.

I've tried to use a SD card with other firmware but also no success.

Please help.

Kind regards,

Daan

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Ewon Recovery.png (Size: 37,7 KB / Downloads: 8) ]]>
I'm trying to downgrade an Ewon Flexy205 15.0s2 to V14

I've searched the forum and it says I need to use Ewon Recovery (F7) in eBuddy.

But in eBuddy my Ewon Recovery is grayed out.

I've tried to use a SD card with other firmware but also no success.

Please help.

Kind regards,

Daan

.png

Ewon Recovery.png (Size: 37,7 KB / Downloads: 8) ]]> <![CDATA[Using Basic Change User Passwors]]> https://techforum.ewon.biz/thread-2863.html Tue, 28 Apr 2026 21:06:20 +0000 LuisEnrique]]> https://techforum.ewon.biz/thread-2863.html
I would like to be able to change a user's password on a Flexy version 15s2 system using only Basic.

Thanks in advance.

Luis]]>
I would like to be able to change a user's password on a Flexy version 15s2 system using only Basic.

Thanks in advance.

Luis]]> <![CDATA[Simple Store & Forward:How to send missed data from a text file after WAN restoration]]> https://techforum.ewon.biz/thread-2862.html Thu, 23 Apr 2026 07:01:02 +0000 leekhilk@ithena.ai]]> https://techforum.ewon.biz/thread-2862.html
I am currently using a Flexy 205 to collect data from PLCs via Modbus and OPC UA. I have a BASIC script that builds a JSON payload and sends it to my IoT platform using the REQUESTHTTPX command.

The Challenge:
Everything works well when the internet is connected. However, when the internet goes down, the REQUESTHTTPX command fails and the data is lost. I need a "Store and Forward" solution that is simple to manage.

My Required Logic:

I want to avoid complex system tools and handle this directly in my script using basic file logic:
Detection: If REQUESTHTTPX fails due to a network error, the script should identify that the internet is down.
Local Storage: Instead of losing the data, the script should append the JSON string to a simple text file on the Ewon (e.g., /usr/buffer.txt).
Restoration: Once the internet is back, the script should read that text file line-by-line and send the stored payloads to the server.

I want to keep this as manual and clear as possible so I can easily maintain the code. Any help or logic flows would be greatly appreciated!]]>
I am currently using a Flexy 205 to collect data from PLCs via Modbus and OPC UA. I have a BASIC script that builds a JSON payload and sends it to my IoT platform using the REQUESTHTTPX command.

The Challenge:
Everything works well when the internet is connected. However, when the internet goes down, the REQUESTHTTPX command fails and the data is lost. I need a "Store and Forward" solution that is simple to manage.

My Required Logic:

I want to avoid complex system tools and handle this directly in my script using basic file logic:
Detection: If REQUESTHTTPX fails due to a network error, the script should identify that the internet is down.
Local Storage: Instead of losing the data, the script should append the JSON string to a simple text file on the Ewon (e.g., /usr/buffer.txt).
Restoration: Once the internet is back, the script should read that text file line-by-line and send the stored payloads to the server.

I want to keep this as manual and clear as possible so I can easily maintain the code. Any help or logic flows would be greatly appreciated!]]> <![CDATA[Enable webserver WAN side with firmware 15]]> https://techforum.ewon.biz/thread-2861.html Wed, 22 Apr 2026 05:19:13 +0000 FlamcoDaan]]> https://techforum.ewon.biz/thread-2861.html
in our factory we use Ewon Flexy's 205 in combination with ViewOn for dashboarding.

The dashboard is shown on several TV's with Amazon firestick.

The firesticks need to connect to the Ewon via WAN side connection to show the ViewOn page.
With firmware 15 the webserver is now closed on the WAN side and we have no dashboard.

Is there a way to enable this again?
otherwise we need to downgrade the Ewons to firmware 14.

Kind regards,

Daan]]>
in our factory we use Ewon Flexy's 205 in combination with ViewOn for dashboarding.

The dashboard is shown on several TV's with Amazon firestick.

The firesticks need to connect to the Ewon via WAN side connection to show the ViewOn page.
With firmware 15 the webserver is now closed on the WAN side and we have no dashboard.

Is there a way to enable this again?
otherwise we need to downgrade the Ewons to firmware 14.

Kind regards,

Daan]]>