Siemens SINAMICS S120 Function Manual page 824

Communication
11.3 Communication via PROFINET IO
Name Limit value
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
Setting criteria for times
● Cycle (T
– T
– T
● T
– Setting the times in T
– T
● Settings and tuning can be done via a tool (e.g. HW Config in SIMATIC S7).
824
Description
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
must be set to the same value for all bus nodes. T
DC
> T and T
DC CA_Valid DC
T is thus large enough to enable communication with all bus nodes.
DC
and T
IO_Input IO_Output
time in the position control loop.
> T + T
IO_Output CA_Valid
= 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
≧ T
IO_Output
and T to be as short as possible reduces the dead
IO_Input IO_Output
IO_Output_MIN
= 375 µs
IO_BASE
= 250 µs
IO_BASE
is a multiple of SendClock.
DC
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions