Siemens SINAMICS S110 - Page 635

Communication
9.4 Communication via PROFINET IO
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
633
Designations and descriptions for motion control
Table 9- 43 Time settings and meanings
Name Limit value Description
T
DC_BASE
- 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 ≤ 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
Time base for T
IO_Input
, T
IO_Output
T
IO_BASE
=T_IO_BASE ∙ 1 ns= 125000 ∙ 1 ns = 125 µs
T_IO_InputMIN ≤
T_IO_Input < T_DC
Time of actual value acquisition
This is the time at which 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
Minimum value for T
IO_Input
Calculation: T
IO_InputMIN
= T_IO_InputMIN ∙ T
IO_BASE
= 375 µs
T_IO_Output_valid +
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_OutputMIN
Minimum value for T
IO_Output
Calculation: T
IO_OutputMIN
= T_IO_OutputMIN ∙ T
IO_BASE
= 250 µs
T
IO_Output
T_IO_Output_valid The time after which the new control output data (setpoints) are available
for the drive object.
Dx Data_Exchange
This service is used to implement user data exchange between the IO
controller and IO device 1 - n.
R or Rx Computation time, current or position controller