Siemens Sinamics S110 Function Manual page 462

Communication PROFIBUS DP
9.2 Communication via PROFIBUS DP
User data integrity
User data integrity is verified in both transfer directions (master <––> slave) 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.
● Master sign of life
● Slave sign of life
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– STW2.12 ... STW2.15 are used for the master sign of life.
– The master sign of life counter is incremented in each master application cycle
(TMAPC).
– The number of sign-of-life errors tolerated can be set via p0925.
– p0925 = 65535 deactivates sign of life monitoring on the slave.
– Monitoring
The master sign of life is monitored on the slave and any sign-of-life errors are
evaluated accordingly.
The maximum number of tolerated master 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:
– A corresponding message is output.
– The value zero is output as the slave sign of life.
– Synchronization with the master sign of life is started.
– ZSW2.12 ... ZSW2.15 are used for the slave sign of life.
– The slave sign of life counter is incremented in each DP cycle (T ).
DP
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
Drive functions