Technical data

The following messages can occur with the FMA service LSAP_STATUS
The reaction in the user program to receiving this message is not fixed.
The status bytes of the service descriptions are structured as follows:
Value of
link_status
Abbrev.
PROFIBUS
Meaning
00H OK Positive acknowledgment, status was read
RS LSAP not activated on the remote FDL controller
NA No plausible reaction (ack/res) from remote station
DS Local FDL/PHY not in logical token ring or is disconnected
from the bus line
NR Negative acknowledgment, reply data (L_sdu) not available
on the remote FDL controller
15H IV Negative acknowledgment:
- "FDL_RESET" currently active
- invalid parameter in the application block
- passive station (with remote request)
- other FMA service currently active (MAC)
Table 12.6 link_status Message for LSAP_STATUS Confirmation
Role_in_service Service_type
Bit 76543210
Fig. 12.8 Structure of the LSAP_STATUS Byte
Service and Diagnostics using FMA Functions B8976060/02
Volume 1 12 - 20