S5-95U, SINEC L2 Start-Up, Tests, and Diagnostics
3.4.7 Reading Updated Bus Parameters (READ_VALUE)
The READ_VALUE service allows you to read out the updated bus parameters of the local station.
Structure the READ_VALUE The data are stored in the READ_VALUE
request block as follows: confirmation block as follows:
Figure 3-14. Structure of the READ_VALUE Request and Confirmation Blocks
......
....
service_code
Type of service provided by the firmware
READ_VALUE = 0B
H
irrelevant
Confirmation Block
com_class
FMA_Confirmation=01
H
(tacknowledgment from firmware following
FMA_Request)
Byte
a
a
a
a
0
user_id
ID assigned in the FMA_Request
a
a
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1
a
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2
link_status
a
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a
3
a
a
a
a
4
Request Block
com_class
FMA_Request=00
H
(service request)
Byte
a
a
a
a
0
a
a
a
a
1 user_id
Freely assignable ID. That ID is returned
unchanged in the confirmation.
service_code
Type of service requested
READ_VALUE = 0B
H
a
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2
irrelevant
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3-7
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a
Relevant
parameters
a
a
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a
a
9
irrelevant
irrelevant
irrelevant
a
a
5
a
a
6
a
a
7
a
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8
Bus parameter block
(see Table 3-8)
a
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link_status
Table 3-7. link_status Messages for the READ_VALUE Confirmation
link_status Message Significance
00
H
ok (okay): Positive acknowledgement, service was executed,
bus parameters were read out
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EWA 4NEB 812 6112-02
3-21
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