05.91
11 Data Transfer PLC/NC/COM (DB 36)
11.2.1 Structure and signal path
Signal chart with unconditional block call
The following chart showns the paths of all signals when a block is called unconditionally.
Signal chart with unconditional block call
9
8
7
7
7
7
7
7
7
t
D
1
2
3
4
5
6
8
9
1:
READ/WRITE
2:
DATA TRANSFER REQUESTED
3:
FIFO ASSIGNED
4:
DATA TRANSFER BUSY
5:
DATA TRANSFER ASSIGNED
6:
DATA TRANSFER ENDED and (possibly) error
7:
Signal change by FB
8:
Signal change by user
9:
Signal change by FB; omitted if FIFO not yet full
t
D
: Internal interface assigned by data transfer
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HE02
11–5
SINUMERIK 880 (PJ)
