Siemens SINAMICS S120 Function Manual page 418

Communication PROFIBUS DP/PROFINET IO
10.2 Communication via PROFIBUS DP
Name Value
T 4
O
T E10 hex
DX
≐
3600 dec
T 0
PLL_W
T 0
PLL_D
GC
T
TH
Dx
418
Limit value
1)
T + T
DX O_MIN
≤ T ≤ T
O DP
T = 1
O_MIN
T < T
DX DP
-
-
Time of setpoint transfer
This is the time at which the transferred setpoints (speed
setpoint) are accepted by the closed-loop control system after
the start of the cycle.
T = integer multiple of T
O
Servo calculation: T = 4 ∙ T
O
When T = 0: T ≐ T
O O DP
Vector calculation: T = 4 ∙ 1000 µs = 4000 µs
O
When T = 0: T ≐ T
O O DP
T corresponds to the largest speed controller cycle (p0115[1])
O
of a drive object (vector) in the drive unit.
Servo:
Minimum time distance between T
T = 1 ∙ T = 125 µs
O_MIN BASE_IO
Vector:
Minimum time distance between T
T = 1 ∙ T = 1000 µs
O_MIN n_reg
T corresponds to the largest speed controller cycle
n_reg
(p0115[1]) of a drive object (vector) in the drive unit.
Data exchange time
This is the time required within one cycle for transferring
process data to all available slaves.
T = integer multiple of T
DX
T = 1/12 µs at 12 MBaud
Bit
calculation: T = 3600 • T
DX
PLL window
(half the width of the GC synchronization window)
The following applies to the setting:
Small window --> minimization of synchronization
•
fluctuations on the drive
Large window --> higher tolerance of GC fluctuations
•
Calculation (assumption: T
T = 10 • TBIT = 0.833 µs
PLL_W
T = 1/12 µs at 12 Mbps
Bit
PLL dead time
The PLL dead time can be used to compensate for different
data transfer times to the slaves (e.g. due to repeaters).
The slaves with faster transfer times are delayed by a
corresponding PLL dead time.
Calculation: T = 0 ∙ T
PLL_D
T = 1/12 µs at 12 MBaud
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.
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Description
BASE_IO
= 500 µs
BASE_IO
and T
O DX
and T
O DX
Bit
= 300 µs
BIT
= A hex ≐ 10 dez)
PLL_W
= 0 µs
BIT
Drive Functions