Siemens SINAMICS S120 Function Manual page 727

Designations and descriptions for motion control
Table 11- 16 Time settings and meanings
Name Limit value
T -
DC_BASE
T T_DC_MIN ≤ T_DC ≤
DC
T_DC_MAX
T CACF = 1-14
CACF
T T
CA_Valid CA_Valid
T T
CA_Start CA_Start
T
IO_BASE
T T_IO_InputMIN ≤
IO_Input
T_IO_Input < T_DC
T
IO_InputMIN
T T_IO_Output_valid +
IO_Output
T_IO_OutputMIN ≤
T_IO_Output < T_DC
T
IO_OutputMIN
T_IO_Output_valid
Dx
R or Rx
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Description
Time basis for cycle time T
calculation:
T
DC_BASE
Cycle time
T = T_DC × T
DC
T
DC_MIN
T
DC_MAX
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
< T Time, measured from the beginning of the cycle, at which the actual
DC
values of all IO devices for the controller application process (position
control) are available.
> T Time, measured from the beginning of the cycle, at which the controller
CA_Valid
application process (position control) starts.
Time base for T
T
IO_BASE
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: integer factor
Minimum value for T
Calculation: T
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: integer factor
Minimum value for T
Calculation: T
The time after which the new control output data (setpoints) is available
for the drive object.
Data_Exchange
This service is used to implement user data exchange between the IO
controller and IO device 1 - n.
Computation time, current or position controller
DC
=T_DC_BASE × 31.25 µs = 4 × 31.25 µs = 125 µs
,T_DC: Integer factor
DC_BASE
= T_DC_MIN × T
DC_BASE
= T_DC_MAX × T
DC_BASE
= CACF × T_DC = 2 × 500 µs = 1 ms
, T
IO_Input IO_Output
= T_IO_BASE × 1 ns = 125000 × 1 ns = 125 µs
= T_IO_Input × T
IO_BASE
IO_Input
= T_IO_InputMIN × T
IO_InputMIN
= T_IO_Output × T
IO_BASE
IO_Output
= T_IO_OutputMIN × T
IO_OutputMIN
11.3 Communication via PROFINET IO
= 4 × 125 µs = 500 µs
= 32 × 125 µs = 4 ms
= 375 µs
IO_BASE
= 250 µs
IO_BASE
Communication
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