Siemens Sinamics S110 Function Manual page 460

Communication PROFIBUS DP
9.2 Communication via PROFIBUS DP
Name Value
T E10 hex
DX
≐
3600 dec
T 0
PLL_W
T 0
PLL_D
GC
T
TH
MSG
RES
R
T
M
GAP
T
J
1) The values correspond to device master file si0280e5.gs_ and an example configuration.
460
Limit value
1)
T < T
DX DP
-
-
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.
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 the isochronous cycle has expired
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.
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
Description
Bit
= 300 µs
BIT
= A hex ≐ 10 dez)
PLL_W
= 0 µs
BIT
Drive functions