Siemens SIMATIC S5 Manual page 161

S5-95U, SINEC L2
link_status Message in the Confirmation Header
Value of Abbreviation
link_status (PROFIBUS)
00
H
15
H
* SAP 64 is defined as the default SAP.
Invoking FB223 for SDN
OB1 (Sending PLC)
. .
. .
:JU FB 223
Name :SENDER
ANST : F 0.0
LSTA : FY 9
:
:
:BE
Invoking FB224 for SDN
OB1 (Receiving PLC)
. .
. .
:JU FB 224
Name :EMPFANG
EMPF : F 0.1
:
:
:BE
EWA 4NEB 812 6112-02
Table 8-6. link_status Messages for SDN
ok Positive acknowledgement; transmission of data from the
sending (local) station completed
iv - Illegal parameters in the request header or
- Local station is passive or
- Destination station is own station address or
- If own SAP = default SAP
or
- If own SAP default SAP
Send request and fetch confirmation ( section 8.4)
Send initiation bit for the SDN service
Flag byte contains the link_status of the confirmation
Fetch indication ( section 8.4)
Enable receive
Data Transmission by Accessing Layer 2 Services
Meaning
: destination SAP is not default SAP
*
: destination SAP is default SAP
*
Explanation
Explanation
8-21