Siemens SIMATIC S5 CP 523 Manual page 214

Using the "SEND" and "RECEIVE" Function Blocks
8.2.4 Flowchart of "RECEIVE" FB 201
Segment 2
Yes
END
8-24
START
Buffer "RLO at jump"
Issue "Read STATUS" request to
CP 523
Read job acknowledgement from
CP 523
Display CP 523-STATUS
Display CBR (relevant only in
3964(R) mode)
RLO = 0 or SEND executing
No
1
Evaluate RLO and read status
EWA 4NEB 811 6044-02a
CP 523