Siemens SINAMICS S120 Function Manual page 341

Sequence
1. After each zero mark, it is again checked as to whether up to the next zero mark the
2. If one of the limits has a value of 0, then alarm A3x422
3. Display of uncorrected encoder pulses
4. Number of pulses outside the tolerance band
5. You can send the accumulated correction value to a higher-level controller via
x = encoder number (x = 1, 2 or 3)
1)
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
number of pulses lies within the tolerance band. If this is not the case and "pulse number
correction for faults" (p0437.2 = 1) is parameterized, then alarm A3x422
seconds.
For p0437.7 = 1, the number of corrected pulse errors is displayed in r4688 with the
correct sign. Set p0437.7 = 0 in order to indicate the corrected pulse errors per zero mark
distance in r4688.
For a drift after one revolution, if the tolerance band limit is not reached, an alarm is not
output. A new measurement is performed if the zero mark is exceeded.
If the tolerance band is violated, then in addition to alarm A3x422
This value remains for a minimum of 100 ms, so that a controller can detect several
violations in quick succession one after the other even for high-speed drives.
You can send the message bits of parameter r4689 to a higher-level controller via
PROFIBUS / PROFINET as process data.
PROFIBUS (e.g. p2051[x] = r4688). The controller can then set the contents of the
counter to a specific value.
Note
The "tolerance band pulse number monitoring" also functions for external encoders which
operate in a drive line-up as leading value encoder (monitoring the position value XIST1
from a direct measuring system).
Basic functions
7.19 Tolerant encoder monitoring
is output for 5
1)
is deactivated.
1)
r4689.1 = 1 is set.
1)
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