Siemens SINAMICS S120 Function Manual page 450

Communication PROFIBUS DP/PROFINET IO
10.3 Communications via PROFINET IO
Setting criteria for times
● Cycle (T
● T
● Settings and optimization can be done via a tool (e.g. HW Config in SIMATIC S7).
User data integrity
User data integrity is verified in both transfer directions (IO controller <––> IO device) by a
sign of life (4-bit counter).
The sign-of-life counters are incremented from 1 to 15 and then start again at 1.
● IO controller sign of life
● IO device sign of life
450
)
DC
– T must be set to the same value for all bus nodes. T
DC
– T > T and T
DC CA_Valid
T is thus large enough to enable communication with all bus nodes.
DC
NOTICE
After T has been changed on the PROFINET IO controller, the drive system must
DC
be switched on (POWER ON) or the parameter p0972=1 (Reset drive unit) must be
set.
and T
IO_Input IO_Output
– Setting the times in T
time in the position control loop.
– T > T + T
IO_Output CA_Valid
– STW2.12 ... STW2.15 are used for the IO controller sign of life.
– The IO controller sign-of-life counter is incremented on each IO controller application
cycle (T ).
CACF
– The number of sign-of-life errors tolerated can be set via p0925.
– p0925 = 65535 deactivates sign-of-life monitoring on the IO device.
– Monitoring
The IO controller sign-of-life is monitored on the IO device and any sign-of-life errors
are evaluated accordingly.
The maximum number of tolerated IO controller sign-of-life errors with no history can
be set via p0925.
If the number of tolerated sign-of-life errors set in p0925 is exceeded, the response is
as follows:
1. A corresponding message is output.
2. The value zero is output as the IO device sign of life.
3. A new synchronization with the IO controller sign of life is started.
– STW2.12 ... STW2.15 are used as IO device sign of life.
– The IO device sign-of-life counter is incremented in each DC cycle (T
≧ T
DC IO_Output
and T to be as short as possible reduces the dead
IO_Input IO_Output
IO_Output_MIN
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
is a multiple of SendClock.
DC
).
DC
Drive Functions