Siemens SIMATIC NET SPC 4-2 LF Manual page 45

BEGINN-PTR
IND-RD
IND-WR
Figure 5-6
If a frame is received without a SAP extension (rem-SAP, loc-SAP), the SPC 4-2
enters 0FFh in the relevant cell.
If a frame is received without a SAP extension (rem-SAP, loc-SAP), the SPC 4-2
enters 0FFh in the relevant cell.
PROFIBUS Controller SPC 4®-2 LF
C79000-G8976-C157-3
Indication queue
Indication block n-1
Indication block n
Structure of the Indication Queue
FLC Interface
Indication block
Response resp-buf-ptr (8 Bit)
header indic-status
(2 bytes) (00 valid, CFH invalid)
Request req-data-length
header rem-adr
(6 bytes) loc-adr
co-code
rem-sap
loc-sap
Request
buffer
(max. 246
bytes)
45