S5-95U, SINEC L2 Start-Up, Tests, and Diagnostics
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 The data are stored in the LAS_LIST_CREATE
request block as follows: confirmation block as follows:
Figure 3-10. Structure of the LAS_LIST_CREATE Request and Confirmation Blocks
Status byte for station with HSA
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a
Status byte for station 00
Status byte for station 01
service_code
Type of service provided:
LAS_LIST_CREATE = 1B
H
com_class
FMA-Confirmation=01
H
(acknowledgment from firmware
following FMA_Request
)
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a
Relevant
parameters
Byte
irrelevant
Confirmation Block
Byte
a
a
a
0
user_id
ID assigned in the FMA_Request
a
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a
1
a
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a
2
link_status
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3
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4-7
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8
a
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9
........
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a
HSA+8
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0
a
a
a
1 user_id
Freely assignable ID. That ID is
returned unchanged in the
confirmation.
service_code
Type of service requested:
LAS_LIST_CREATE=1B
H
a
a
a
2
irrelevant
a
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a
a
3-7
a
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com_class
FMA-Request=00
H
(service request)
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Request Block
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link_status
Table 3-5. link_status Messages for the LAS_LIST_CREATE Confirmation
link_status-Meldung Significance
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a
ok (okay): Positive confirmation, LAS was read out
iv (invalid): Errorr, local station is passive, service
is impossible
00
H
15
H
EWA 4NEB 812 6112-02
3-17