Name

Initial

Comment

CHECK

0

If the Field Device interface has received a request to provide 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 request, the function block outputs are updated.

RECEIVE_BY_SLOT

2

If the Field Device interface has received a request for the slot and subslot the numbers of which are given in F_ID input, the function block outputs are updated.

POS_RESPONSE

3

After checking or receiving the request to provide a process data record, this function block provides the requested process data record with its RECORD parameter and sends a positive response to the Host Controller.

NEG_RESPONSE

4

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