Efficient Networks Siemens Sinamics S120 - Manual (Page 449)

Communication PROFIBUS DP/PROFINET IO
10.3 Communications via PROFINET IO
Drive Functions
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
449
Designations and descriptions for Motion Control
Table 10-34 Time settings and meanings
Name Value 1) Limit value Description
T
DC_BASE
T_DC_BASE = 4 - Time basis for cycle time T
DC
calculation:
T
DC_BASE
=T_DC_BASE ∙ 31.25 µs = 4 ∙ 31.25 µs =
125 µs
T
DC
T_DC_MIN = 4
T_DC_MAX = 32
T_DC_MIN ≤ T_DC ≤
T_DC_MAX
Cycle time
T
DC
= T_DC ∙ T
DC_BASE
,T_DC: Integer factor
T
DC_MIN
= T_DC_MIN ∙ T
DC_BASE
= 4∙125 µs = 500 µs
T
DC_MAX
= T_DC_MAX ∙ T
DC_BASE
= 32∙125 µs = 4 ms
T
CACF
- CACF = 1-14 IO controller application cycle time
This is the time frame in which the IO controller application
generates new setpoints (e.g. in the position controller
cycle).
Calculation example: T
CACF
= CACF∙ T_DC=
2∙500 µs = 1 ms
T
CA_Valid
- T
CA_Valid
< T
DC
Time, measured from the beginning of the cycle, at which
the actual values of all IO devices for the controller
application process (position control) are available.
T
CA_Start
- T
CA_Start
> T
CA_Valid
Time, measured from the beginning of the cycle, at which
the controller application process (position control) starts.
T
IO_BASE
T_IO_BASE =
125000
Time base for T
IO_Input
, T
IO_Output
T
IO_BASE
=T_IO_BASE ∙ 1 ns= 125000 ∙ 1ns = 125 µs
T_IO_InputMIN <
T_IO_Input ≤ T_DC
Time of actual value acquisition
This is the time at which the actual values are acquired
before a new cycle starts.
T
IO_Input
= T_IO_Input ∙ T
IO_BASE
T_IO_Input: integer factor
T
IO_Input
T_IO_InputMIN = 3
T
IO_InputMIN
Minimum value for T
IO_Input
Calculation: T
IO_InputMIN
= T_IO_InputMIN ∙ T
IO_BASE
= 375 µs
T_IO_OutputMIN ≤
T_IO_Output ≤ T_DC
Time of setpoint transfer
This is the time, calculated from the beginning of the cycle,
at which the transferred setpoints (speed setpoint) are
accepted by the closed-loop control system.
T
IO_Output
= T_IO_Output ∙ T
IO_BASE
T_IO_Output: integer factor
T
IO_Output
T_IO_OutputMIN = 2
T
IO_OutputMIN
Minimum value for T
IO_Output
Calculation: T
IO_OutputMIN
= T_IO_OutputMIN ∙ T
IO_BASE
=
250 µs
Dx Data_Exchange
This service is used to implement user data exchange
between IO controller and IO device 1 - n.
R or Rx Processing time for speed or position controller
1) The values correspond to the device master file gsdml-v2.1-siemens-sinamics-s-cu3x0-20070615.xml