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TCP/IP Socket communication not work

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Dear Support,


The connecting is working.

I have no idea why can't i receive the message from PLC when pressing te F2 key.

PC IP end with 103.5

PLC IP end with 103.109

PLC type: Vision280


Have you any idea?


Best regards:









Edited by ExtSol
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  • MVP 2023
On 6/23/2020 at 12:59 AM, ExtSol said:

PLC IP end with 103.109

In your program it is, and the connection attempts show this.  But I don't think this is the issue.

There might be a bit of client/master confusion going on. What happens if you switch these around a little in testing, at both ends, to try all possible variations?

cheers, Aus

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9 hours ago, AlexUT said:

This is a good practice.

Alex, can you please explain why?  Just curious.

Also, good call on 168, I missed that.  I've said it before, why isn't this a default setting in Visilogic?  It seems pointless to not have it on.  If you're doing ethernet, it's necessary.  If you aren't, it won't affect anything.

cheers, Aus

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Use a different socket and a different port.  Socket 1:20256 is the default programming access and the V280 may be stomping on it.  Try Socket 2:20257.

Is your terminal program expecting a CRLF (0D0A) ETX at the end of the string transmission?

Did you try adding a TCP/IP Scan block to your program and sending data back down?

Joe T.


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