Twincat 2.0 ADS VB.NET client

shakreeelmi · Mar 29, 2019

Hello,

I'm currently trying to connect my vb.net application with my Twincat PLC. This is what I have so far (i call it from a sub):

Code:

Dim ads As TcAdsClient = New TcAdsClient

ads.Connect(netID, Int32.Parse(port)) 'default port of Twincat 3 is 851 / Twincat 2 is 801

If ads.IsConnected = True Then
   WriteLine("Connection ok" & vbCrLf)
Else
   WriteLine("Connection error")
              
End If

Now whenever I try to connect to the PLC, it says "Port not open". Weird is, I'm able to control my PLC through the Twincat PLC software using the same port. Please advise me on this matter. Thank you.

Archie · Mar 29, 2019

Is your TwinCAT run time on the same PC you are running the VB application? If so, try setting the netID to an empty string.

shakreeelmi · Apr 1, 2019

Archie said:
Is your TwinCAT run time on the same PC you are running the VB application? If so, try setting the netID to an empty string.

Hello Archie,

Thanks for the reply.

To answer your question, yes. The VB application is running on the same PC as my TwinCAT. Following to your suggestion, I've already tried with empty netID string. Following are some of the thing's I've tried:

-ads.Connect("", Int32.Parse(801))
-ads.Connect(Int32.Parse(801))
-ads.Connect(801)

But no luck

I have a question, do I need to open any port on either my pc or the beckhoff plc? For example 801, or I've read some where in the manual to open incoming port 48898 TCP and 48899 UDP, is this necessary?

Please further advise on this matter. Thank you.

tarik1978 · Apr 1, 2019

Check this link
https://infosys.beckhoff.com/englis...tml/tcquickstart_samplevisualbasicnet.htm&id=

Archie · Apr 1, 2019

shakreeelmi said:
I have a question, do I need to open any port on either my pc or the beckhoff plc? For example 801, or I've read some where in the manual to open incoming port 48898 TCP and 48899 UDP, is this necessary?

Since you are communicating with a run time that is on the same PC, you should not have to open any ports. You could try a Wireshark capture using the loopback adapter to see if that gives you any more clues.

Have you tried the sample app for AMS communications from Beckhoff?

shakreeelmi · Apr 2, 2019

Archie said:
Since you are communicating with a run time that is on the same PC, you should not have to open any ports. You could try a Wireshark capture using the loopback adapter to see if that gives you any more clues.

Have you tried the sample app for AMS communications from Beckhoff?

I'm not familiar with Wireshark application. Yes, as mentioned below, I've tried with tarik1978 suggestion. Still showing the same error.

tarik1978 said:
Check this link
https://infosys.beckhoff.com/englis...tml/tcquickstart_samplevisualbasicnet.htm&id=

The example is interesting. Unfortunately it gives the same error which is "Ads-Error 0x748 : Port is not open."

thao21 · Oct 7, 2023

shakreeelmi said:
Hello Archie,

Thanks for the reply.

To answer your question, yes. The VB application is running on the same PC as my TwinCAT. Following to your suggestion, I've already tried with empty netID string. Following are some of the thing's I've tried:

-ads.Connect("", Int32.Parse(801))
-ads.Connect(Int32.Parse(801))
-ads.Connect(801)

But no luck

I have a question, do I need to open any port on either my pc or the beckhoff plc? For example 801, or I've read some where in the manual to open incoming port 48898 TCP and 48899 UDP, is this necessary?

Please further advise on this matter. Thank you.

If you are running the TwinCAT PLC and the VB application on the same PC, you should not need to open any ports. However, if the TwinCAT PLC is on a different PC, you will need to open port 801 on the TwinCAT PLC PC. You may also need to open incoming ports 48898 TCP and 48899 UDP on the TwinCAT PLC PC, but this is not always necessary. I know this is an old discussion. Appealing to the admin. Please approve my post,Thanks

Twincat 2.0 ADS VB.NET client

shakreeelmi

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Archie

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shakreeelmi

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tarik1978

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Archie

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shakreeelmi

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thao21

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