EWEB Open Socket Interfacing

[LOCITeam]

Hello!

I am new to PLC programming and am required to interface a Symeo radar with a CompactGuardlogix L45s PLC. The Symeo radar uses tcp/ip fixed frame protocol at 25 bytes. Now to communicate with the radar I have aselected the 1768-EWEB module I am just unsure how to actually use it. I have read the manuals and set-up my ladder logic like the screenshot below but I still cannot receive data much less return an instance number from the create socket.

Can anyone off suggestions for me?

Thank-You!

 

[kjs1230]

Once you create and open the socket, then you will need to use the WriteSocket and ReadSocket msgs instructions to read and write data. From the rockwell knowledge base, the ENET-AT002A document describes this. Make sure you pass the Instance value from the create socket instruction to the read/write and whatever else. The Socket setup and messages instructions used will depend on if the PLC is setup to be a TCP cliet or TCP server. Good Luck!

 

[LOCITeam]

Hello, as you can see in the screenshot I already set up the create, open and read. It is not working for me however. Does the main program look like it should work? Am I moving the instance correctly?

 

[kjs1230]

It looks like you are moving the instances correctly. Are you getting errors? If so, what are the error codes? There is some sample logic available on the Rockwell Knowledgebase https://rockwellautomation.custhelp.com/app/answers/detail/a_id/33672/related/1

Also, check and make sure the device you are connecting to is listening for a socket connection

 

[LOCITeam]

Ok, I do get an error code but i believe it is because it times out or does not open the connection. The error code is 16#0290. I am unable to view the example because I do not have a techconnect contract.

Also here is my configuration screens.

 

[Contr_Conn]

For sockets path will be pointing to your EWEB module
It should not have 2,IP

Also "Create" message source tag should not have any IP addresses.

There are multiple Sockets examples in the knowledgebase explaining how to use them with simple examples
Start with TN 32962

 

[LOCITeam]

Sorry I am not able to access the examples in the Knowledgebase, I don;t have a Techconnect contract. As for the 2, IP as soon as I erase the create_sock throws an error imediately...

 

[Contr_Conn]

what is "Create" error code?

As I said before, your "source" tag structure vaules are wrong

 

[LOCITeam]

Here are some screenshots of my errors, in the tags and in the "create" message block. I am trying to communicate with a radar sensor with IP 192.168.1.99 port 3046. The radar is "listening" for a connection as I was told from the manufacturer.

Thank-you

 

[Contr_Conn]

Source tag port should be 0
Message path is wrong, it shoud point to EWEB module in Slot 1 or 2

 

[LOCITeam]

Ok, here is the new error that is generated after I point to the EWEB.

 

[Contr_Conn]

Are you sure that EWEB is in slot1 and not ENBT?
Can you send RSlinx screenshot?

 

[kjs1230]

The error you are seeing in the create msg 16#0005 is as follows:

The socket instance does not exist. This error can occur in these scenarios:
• The socket instance number returned by the Socket Create service does not match the
instance number in the socket read or write message.
• The socket instance closed due to inactivity.​

• The socket was deleted by the DeleteSocket service.

 

[Contr_Conn]

You will also get error 16#0005 if you send message to a device that does not have socket object, like 1768-ENBT
I suspect that Slot1 is actually ENBT and EWEB is in slot 2
That is why you need to look in Rslinx that will telly you actual module location

 

[LOCITeam]

Ok, you were right. I had the my EWEB and ENBT module reversed in RSLogix. Rookie mistake but this is my first time ever using a PLC/Ladder Logic .

So I made it past the create socket and now the open socket is giving me an error. I believe it is to do with my open socket input parameters so I have posted yet another screenshot.