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08.99
Table 5-37
Time settings for "DP slave 611U", continued
1)
Name
Value
T
E10
T
DX
hex
8 3600
dec
T
0
–
PLL_W
T
0
–
PLL_D
1) The values correspond to the master device file SIEM808F.GSD
E Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
5.8
Motion Control with PROFIBUS–DP (from SW 3.1)
Limit value
< T
Data exchange time
DX
DP
This is the time which is required to transfer, within one
DP cycle, the process data to all of the slaves.
T
= integer multiple of T
DX
= 1/12 µs at 12 Mbaud
T
Bit
Calculation: T
PLL window
(half the window width of the GC synchronizing window)
The following applies to the setting:
S
Small window ––> minimization of synchronization
fluctuations on the drive
S
Large window ––> larger tolerance with respect to
GC fluctuations
Calculation: (assumption: T
= 10 S T
T
PLL_W
= 1/12 µs at 12 Mbaud
T
Bit
Recommendation: Set T
––> the "DP slave 611U" then automatically uses the
standard value of 0.81 µs
PLL dead time
The PLL deadtime can be used to compensate for differ-
ent data transfer times to the slaves (e.g. due to the use
of repeaters).
The slaves with faster transfer times are delayed with a
corresponding PLL dead time.
Calculation: T
= 1/12 µs at 12 Mbaud
T
Bit
5 Communications via PROFIBUS DP
Description
Bit
= 3600 S T
= 300 µs
DX
BIT
= A
PLL_W
Hex
= 0.833 µs
BIT
to 0 (standard value)
PLL_W
= 0 S T
= 0 µs
PLL_D
BIT
8 10
)
Dec
5-301
5
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