S5-95U, SINEC L2 Data Transmission by Accessing Layer 2 Services
link_status Message in the Confirmation Header
Table 8-9. link_status Messages for the SRD Service
* SAP 64 is defined as the default SAP.
Value of
link_status
Meaning
Positive acknowledgement for data sent; reply data with low
priority available
Positive acknowledgement for data sent; reply data with
high priority available
Positive acknowledgement for data sent; negative
acknowledgement for reply data
Negative acknowledgement; remote PLC is in the STOP mode
Prerequisite: Destination station is an S5-95U and the connection
has been properly configured at the destination station
Negative acknowledgement; resources of the remote FDL control
not available
service_code or rem_add_station not activated at the remote
station
No response from remote station or response not plausible
- Illegal parameters in the request header or
- Local station is passive or
- Destination station is own station address or
- If own SAP = default SAP
*: destination SAP is not default SAP
or
- own SAP default SAP
*: destination SAP is default SAP
08
H
0A
H
09
H
01
H
02
H
03
H
11
H
15
H
Abbreviation
(PROFIBUS)
dl
dh
nr
ue
rr
rs
na
iv
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a
a
link_status Message in the Indication Header
Table 8-10. link_status Messages (Indications) for the SRD Service
Value of
link_status
Meaning
The reply to this SRD transaction was made with low-
priority data
The reply to this SRD transaction was made with high-
priority data
No reply data were transmitted in connection with this SRD
transaction
20
H
21
H
22
H
Abbreviation
(PROFIBUS)
lo
hi
no_data
a
a
a
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