Siemens SINAMICS S120, Function Manual

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Communication
11.2 Communication via PROFIBUS DP
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
791
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 an arbitrary
value between 1 and 15.
● Master sign-of-life
–
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 tolerated master sign-of-life errors in succession (of an isochronous
motor) 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 can be set via p0925.
If the number of tolerated sign-of-life errors in succession 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
).
Example: SINAMICS vector drives with SIMOTION D4x5 and/or CX modules
To determine which 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
DP
= 3.0 ms (T
DP
= DP cycle time)
2. T
I
= T
o
= 1.5 ms (T
I
= time of actual value acquisition, T
o
= time of setpoint transfer)
3. T
MAPC
= 6.0 ms (T
MAPC
= master application cycle time)
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.