Siemens SINAMICS S120 Installation And Start-Up Manual page 143

Table 4-18 Time settings and meanings, continued
1)
Name Value
T 0
PLL_W
T 0
PLL_D
GC
T
TH
Dx
MSG
RES
R
T
M
GAP
T
J
1) The values correspond to device master file si0280e5.gs_
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
Limit value
– PLL window
(half the width of the GC synchronization window)
The following applies to the setting:
S
Small window
fluctuations on the drive
S
Large window
Calculation: (assumption: T
T
PLL_W
T
Bit
– PLL dead time
The PLL dead time can be used to compensate for dif-
ferent data transfer times to the slaves (e.g. due to re-
peaters).
The slaves with faster transfer times are delayed with a
corresponding PLL dead time.
Calculation: T
T
Bit
Global Control telegram (broadcast telegram)
Token hold time
This time is calculated by the engineering system.
Data_Exchange
This service is used to implement user data exchange
between master and slave 1 – n.
Acyclic service
After cyclic transmission, the master checks whether the
token hold time has already expired. If not, another
acyclic DPV1 service is transmitted.
Reserve: "Active pause" until expiry of the isochronous
cycle
Processing time for speed or position controller
Master time
This is the time from the start of the position controller
cycle to the start of master closed-loop control.
Attempt to open connection with new node.
This attempt takes place every xth cycle.
T returns the duration of the cycle jitter.
J
The cycle jitter is the delay of the GC telegram.
Communication via PROFIBUS
Motion control with PROFIBUS
Description
–>
minimization of synchronization
–>
higher tolerance of GC fluctuations
PLL_W
= 0.833 µs
= 10 S T
BIT
= 1/12 µs at 12 Mbaud
= 0 S T
PLL_D BIT
= 1/12 µs at 12 Mbaud
= A hex 8 10 dec)
= 0 µs
4-143