Start-Up, Tests, and Diagnostics S5-95U, SINEC L2
3.4.8 Reading Out Available Token Hold Time When Receiving the Token
(TIME_TTH_READ)
The TIME_TTH_READ service gives you the available token hold time when receiving the token.
It is very useful in the start-up phase for setting the target rotation time.
If the available token hold time moves towards zero, you must assign a higher value to the target
rotation time. Since the available token hold time fluctuates, you should read it out several times at
short intervals and calculate its mean value.
Structure the TIME_TTH_READ The data are stored in the TIME_TTH_READ
request block as follows: confirmation block as follows:
Figure 3-15. Structure of the TIME_TTH_READ Request and Confirmation Blocks
Remaining token hold time *
(
high word
)
service_code
Type of service requested:
TIME_TTH_READ=23
H
Remaining token hold time *
(low word)
service_code
Type of service provided:
TIME_TTH_READ=23
H
com_class
FMA-Confirmation=01
H
(acknowledgment from firmware
following FMA_Request
)
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Relevant
parameters
Byte
irrelevant
Confirmation Block
Byte
a
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a
0
user_id
ID assigned in the FMA_Request
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link_status
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0
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a
1 user_id
Freely assignable ID. That ID is returned
unchanged in the confirmation.
a
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2
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3-7
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a
com_class
FMA-Request=00
H
(service request)
a
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irrelevant
*
The values for the remaining token hold time can be in the range of 0 to 1 048 320 bit times.
link_status
Table 3-9. link_status Messages for the TIME_TTH_READ Confirmation
link_status Message Significance
00
H
15
H
ok (okay): Positive acknowledgement, rest token hold time
was read out
iv (invalid): Error, local station is passive,
service is impossible
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