Writing to sockets with Citect

[craig_blizard]

Hey Marsupilami,

Thanks for the tips. you are correct, i should be able to get this to work but something strange is definitely going on.

In answer to your questions:
1) there is no telnet port however using ssh and netcat i can definately connect to the device through the port i have configured in my citect setup.
2) yes i ran the computer setup wizard
it is all pretty much standard, this pc is an ioserver as far as i can tell
3) i am not running multiprocess
4) i am running citect version 7.1
5) using wireshark i am not seeing any traffic coming from citect only what is expected from the PLC end.
6) looking into the kernal i wasn't able to use the TCPIP debug character for some reason. Not really sure how do use it but i will read up on that next.
7) both sides have TCP for the port that i am talking but the PLC also has a seperate dedicated UDP port used for broadcasting distributed messages. This has no effect on the port i am interested in.
8) no messages in the kernal that point to anything wrong.

THIS IS SO STRANGE .. It's a very simple implementation.

I will comment on the current setup next.

 

[craig_blizard]

Hey Again,

In reference to your point about seeing my comment on the user list.

I have a port setup and always had. In summary i have the following.

single cluster: cluster
single ioserver: server (using localhost network address)
single board: BOARD1 (type: TCPIP, address: 0, io port: n/a all other n/a)
single port: BOARD1_PORT1 (number:1, name:BOARD1, Special Opt -I10.200.60.100 -P50030 -T)
single IO Device: IODevice (number:1, address:1, Protocol: ASCII, Port Name: DISKDRV, MEMORY:False)

I have no variable tags at all. My plan is to at a later stage use the ComOpen to read a bunch of ASCII data from my remote device and then write it into place DISK tags that can store the ASCII read/writes.

The function sits on my page and runs StartSerial("BOARD1_PORT1");

I hope that this string then gets passed into my cicode function StartSerial.

The cicode function is as follows:

******************************************
INT
FUNCTION
StartSerial(STRING sPort);
INT hPort;
hPort = ComOpen(sPort, 0);
IF hPort < 0 THEN
Prompt ("Cannot open port" + sPort);
RETURN -1;
END
Prompt("Port is open");
! other stuff in here
! other stuff in here
ComClose(hPort);
Return 0;
END
*****************************************

On the page all i ever get is "cannot open port 0" so it is either never executing (which i think is more likely) or it somehow isn't getting the port linkage. Do i need to hardcode the port name into the cicode instead of pass it in?

 

[Marsupilami]

Craig,

what strikes me as odd, is that you get the message "cannot open port 0". while in your code you use "Prompt ("Cannot open port" + sPort);"

this would mean that sPort = 0 so you are executing "hPort = ComOpen(0, 0);" while it should be "hPort = ComOpen("Name of the port in the project editor", 0);"

Regards,

Marsi