Sending UDP Data

PLCnext Engineer
1

I have an AXL2152 and am trying to read in a 3rd party IO-Link sensor to the IOL8.

I am able to successfully read in synchronous data (haven’t been able to make asynchronous work). I am then trying to publish this data over UDP.

I have it almost working, this is how far I’ve gotten:
IF socket_active = TRUE THEN
UDP_SEND_22(REQ := FALSE, HANDLE := serv_sock, DEST_IP := ip_address, DEST_PORT := 9999, DATA_CNT := data_size, DATA := iol_1_1_IN, ERROR => sender_error, STATUS => sender_status, BUSY => sender_busy, DONE => sender_done);
IF sender_busy = FALSE THEN
UDP_SEND_22(REQ := TRUE, HANDLE := serv_sock, DEST_IP := ip_address, DEST_PORT := 9999, DATA_CNT := data_size, DATA := iol_1_1_IN, ERROR => sender_error, STATUS => sender_status, BUSY => sender_busy);
END_IF
END_IF

Where iol_1_1_IN is the input global variable of the sensor. I have a small python script on the computer I am trying to read from that receives some times just garbage, and at best the first byte of the iol_1_1_IN WORD.

I have even tried writing this iol_1_1_IN to a buffer of a byte array, but this has had the same result. I can’t tell if this is an issue with how I am reading the data (I do not expect this), or how I am sending the data (I am more suspicious of this). I’d be beholden for a good structured text example using UDP.

Thanks in advance for the help.

2

Hi!
It seems you are missed with send request management. Try to modify it in the next way…
UDP_SEND_22( HANDLE := serv_sock
, DEST_IP := ip_address
, DEST_PORT := 9999
, DATA_CNT := data_size
, DATA := iol_1_1_IN
, ERROR => sender_error
, STATUS => sender_status
, BUSY => sender_busy
, DONE => sender_done);
IF socket_active and not sender_busy THEN
UDP_SEND_22.REQ := TRUE;
END_IF;
IF sender_done or sender_error or NOT socket_active THEN
UDP_SEND_22.REQ := FALSE;
END_IF;