Each send or receive block can only process one data message. Ideally, new data are available at each user task run-through or new data can be sent.

If the output OV (send block only) indicates TRUE, the function block computes more quickly than the data can be sent. This can happen if the receive block is not computed quickly enough and has thus not collected all the data.

Alternatively, this block sends either cyclically or if the input value is changed. Ideally, the topical data can be sent via the telecontrol link in connection with every user task run-through.