Send via Request Pin

The SEND signal is evaluated on the rising edge, the RDY signal remains applied for one computation cycle. If a rising edge is generated again at the SEND signal although no acknowledgement has yet been received from the receiver, the OV pin is set in order to indicate that an overrun has happened. The evaluation of the receive acknowledgement is carried out before the evaluation of whether transmission is to take place. This means, assuming that there is an appropriately fast telecontrol link, that in connection with change-driven and cyclic transmission, a transmission job can be sent in connection with every computation of the block. In connection with send via the request pin it is possible to send only in connection with every second computation (send takes place only with a rising edge).