Reading Out A List Of All Active Stations On The Network (Las_List_Create) - Siemens SIMATIC S5 Manual
Interface of the programmable controller
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S5-95U, SINEC L2
3.4.5
Reading Out a List of All Active Stations on the Network
(LAS_LIST_CREATE)
The LAS_LIST_CREATE (List of Active Stations) service delivers a list of all active stations on
the network up to HSA.
The creation of this list does not burden the bus (local service).
Figure 3-10 shows the structure of the LAS_LIST_CREATE request and confirmation blocks.
Structure the LAS_LIST_CREATE
request block as follows:
Request Block
Byte
0
com_class
FMA-Request=00
service request
(
1
user_id
Freely assignable ID. That ID is
returned unchanged in the
confirmation.
2
service_code
Type of service requested:
LAS_LIST_CREATE=1B
3-7
irrelevant
Relevant
parameters
Figure 3-10. Structure of the LAS_LIST_CREATE Request and Confirmation Blocks
link_status
Table 3-5. link_status Messages for the LAS_LIST_CREATE Confirmation
link_status-Meldung
00
H
15
H
EWA 4NEB 812 6112-02
The data are stored in the LAS_LIST_CREATE
confirmation block as follows:
H
)
H
HSA+8
ok (okay): Positive confirmation, LAS was read out
iv (invalid): Errorr, local station is passive, service
is impossible
Start-Up, Tests, and Diagnostics
Confirmation Block
Byte
0
com_class
FMA-Confirmation=01
acknowledgment from firmware
(
following FMA_Request
1
user_id
ID assigned in the FMA_Request
2
service_code
Type of service provided:
LAS_LIST_CREATE
3
link_status
4-7
irrelevant
8
Status byte for station 00
9
Status byte for station 01
........
Status byte for station with HSA
Significance
H
)
=
1B
H
3-17
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