Siemens SINAMICS S120 Function Manual page 742

Communication
10.2 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
– Monitoring
● Slave sign of life
Example: SINAMICS vector drives with SIMOTION D4x5 and/or CX modules
To determine what cycles in the SINAMICS drive unit will be set after a project has been
downloaded, dependable cycle values should be initially set in HW Config.
The following settings and sequences are recommended:
1. T
2. T
3. T
After a successful download, all current and speed controller cycles are visible. These cycles
can be optimized in HW Config if necessary.
The cycles are set in HW Config under the DP slave properties of the SINAMICS drive unit
(slave, master e.g. SIMOTION D4x5) under the "Clock synchronization" tab.
740
– STW2.12 ... STW2.15 are used for the master sign of life.
– The master sign-of-life counter is incremented on each master application cycle
(T ).
MAPC
– The number of sign-of-life errors tolerated can be set via p0925.
– p0925 = 65535 deactivates sign-of-life monitoring on the slave.
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 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
= 3.0 ms (T = DP cycle time)
DP DP
= T = 1.5 ms (T = time of actual value acquisition, T
I o I
= 6.0 ms (T
MAPC MAPC
= master application cycle time)
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
).
DP
= time of setpoint transfer)
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Drive functions