Communication
9.3 Communication via PROFIBUS DP
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
601
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
– 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.
● Slave sign of life
– 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
).
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