Hi,

PC needs a "program" to establish also the connection.

There are Ports 7 or 9 to test this.

Check this:

How do you check a TCP or UDP connection if there is no communication partner?

Regards,

Towome

 Hello,

klimczykk

I want to create connection between PLC as TCP Server and PC as TCP Client. I use TCON function to open TCP port, but connection is never established. How can I open tcp port or what kind of different configuration is required to establish connection like that?

 some tips:

1. PC and PLC at same subnet/network? No Gateway/Router required?

2. what PC application? From your screenshots isn't clear you want open port 2002. It is only clear from Wireshark, looks like. 

3. I recommend set in PLC connection Port address of PC 0 for test. I expect Port value 0 as ANY.

4. internal OS Firewall rule set for TCP traffic for your application?

Hello,

that rule is ok but try set on PC side inside PLC connection definition -> value 0 on Port input field for test. Recompile, download to PLC and do test.

 Hello,

klimczykk

I was told that packets are not blocked by firewall. Also when I reverse configuration (PC as Server, PLC as Client) everything works fine.

 and where you told that? Show us your reverse cfg inside PLC connection. I'm curious what Port you've set there for Server side. Show us also Hercules screenshot to see its IP and Port defined with connection from PLC established. 

aaaaah ok,

so Active connection is set to PC side, Port is clear and your Hercules can't connect to PLC? If you set in Hercules connect to Server IP and Port (as PLC side is set) then you must have connection ok. Is S7-1500 somehow also cfg as security required? Really I don't know. Ok, show screenshot of Hercules as Client so we can see that Port 2002 set there for connection. I expect your Hercules as my attachment.

Hello,

then it is clear that Port what PC occupy is outside of PLC expected range probably. From your first ZIP and Wireshark data, it is there Port of PC 57556 what is maybe outside of expected range and therefore PLC refuse connection. Really I'm out of ideas what else can be problem ast your side. Maybe set in PLC connection that PC Active connection Port value 2000, for test.

Update: it looks to me like some problem at your company network probably because if I good remember, with my S7-1200 as TCP Server I had also Client PC (connection Port at  Active right set with blank), now I remember correctly and I didn't have problems with conection.

Hello,

just another tip what can affect connection. Try set at PLC connection cfg - PC IP field blank, as is clear any IP can connect to your PLC Server, leave Port of PC right side also blank  This can be problem, existed with static IP set.

Really I'm out of next ideas, also I remember I didn't have problems with also Client PC right side defined static IP as my PC has with Client app.

I did now some tests with S7-1200, with my Client app and also with Hercules - No problems.

I expect your network refuse TCP traffic then no other ideas...

Hello,

glad to help you. To my situation, no problems with any cfg, IP of Client or not, same all is working correctly with my S7-1200.

Just one better description to be all clear and why I described that as I did:

DurisI

3. I recommend set in PLC connection Port address of PC 0 for test. I expect Port value 0 as ANY.

 I was mean inside Conenction instance DB as Remote port, here is set 0 as ANY Port  it is probably depended to TCON_IPV4 structure defined in case of use this system of connection cfg.