S5-95U, SINEC L2 Start-Up, Tests, and Diagnostics
3.4.6 Reading the Status of Another Station (FDL_STATUS)
The FDL_STATUS service delivers information about the status of another station on the network
(remote service).
Structure the FDL_STATUS request The data are stored in the FDL_STATUS
block as follows: confirmation block as follows:
Figure 3-12. Structure of the FDL_STATUS Request and Confirmation Blocks
user_id
ID assigned in the FMA_Request
service_code
Type of service provided:
FDL_STATUS = 22
H
Status byte for remote station
a
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a
a
Relevant
parameters
Byte
irrelevant
Confirmation Block
com_class
FMA-Confirmation=01
H
(acknowledgment from firmware following
FMA_Request)
Byte
a
a
a
a
0
a
a
1
a
a
2
link_status
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a
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3
a
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a
4-5
a
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8
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a
rem_add_station
Address of target station
(TLN=1 to 126)
com_class
FMA-Request=00
H
(service request)
a
a
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a
0
a
a
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a
a
a
1 user_id
Freely assignable ID. That ID is returned
unchanged in the confirmation.
service_code
Type of service requested:
FDL_STATUS=22
H
a
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2
a
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4 irrelevant
irrelevant
a
a
3
a
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5
irrelevant
a
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6
irrelevant
a
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7
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Request Block
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rem_add_station
Address of target station
(TLN=1 to 126)
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irrelevant
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link_status
Table 3-6. link_status Messages for the FDL_STATUS Confirmation
link_status Message Significance
00
H
15
H
ok (okay): Positive confirmation, FDL_STATUS was read out
iv (invalid): The following errors may have occurred:
- Local station is passive, service is not possible
- Target station address is own address
- Target station address is higher than 126
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