Name

Initial

Comment

CHECK

0

If the Field Device interface has received a process data record, only the outputs NEW, SLOT, INDEX and RLEN are set. Multiple calls of this function block with MODE=0 returns the outputs for the same request.

RECEIVE

1

If the Field Device interface has received a process data record, the function block outputs are updated and the data record is transferred to the RECORD parameter.

RECEIVE_BY_SLOT

2

If the Field Device interface has received a process data record for the slot or subslot the num-bers of which are given in input F_ID, the function block outputs are updated and the data re-cord is transferred to the RECORD parameter.

POS_RESPONSE

3

The service is responded positively.

NEG_RESPONSE

4

After checking the request to receive a process data record, this function block refuses to accept this record and sends a negative response to the Host Controller. The error reason is given with the inputs CODE1 and CODE2.