S5-95U, SINEC L2 Data Transmission by Accessing Layer 2 Services
link_status Message in the Confirmation Header
Table 8-5. link_status Message for SDA
Meaning
* SAP 64 is defined as the default SAP.
Value of
link_status
Positive acknowledgement, service executed
Negative acknowledgement; remote PLC is in STOP mode
Prerequisite: Destination station is an S5-95U and the connection
has been properly configured at the destination station
Negative acknowledgement; resources of 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
00
H
01
H
02
H
03
H
11
H
15
H
Abbreviation
(PROFIBUS)
ok
ue
rr
rs
na
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Invoking FB223 for SDA
OB1 (Sending PLC) Explanation
. .
. .
:JU FB 223
Send request and fetch confirmation ( section 8.4)
Name :SENDER
ANST : F 0.0
Send initiation bit for the SDN service
LSTA : FY 9 Flag byte contains the link_status of the confirmation
:
:
:BE
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EWA 4NEB 812 6112-02
8-17
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