Tolerance Band Pulse Number" Monitoring - Siemens Sinamics S120 Function Manual

Basic functions
6.18 Tolerant encoder monitoring
6.18.8

"Tolerance band pulse number" monitoring

This function monitors the number of encoder pulses between two zero marks. An alarm is
output if the number lies outside a tolerance band that can be selected.
Commissioning
● Set parameter p0430.2 = 1 to activate the "tolerance band pulse number monitoring"
● Using parameters p4683 and p4684, set the upper and the lower limits of the tolerance
Principle of operation
● After each zero mark, it is again checked as to whether up to the next zero mark the
● If one of the limits has a value of 0, then alarm A3x422
● Display of uncorrected encoder pulses
● Number of pulses outside the tolerance band
● You can send the accumulated correction value to a higher-level control via PROFIBUS
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).
x = encoder number (x = 1, 2 or 3)
1)
282
function.
band. Within this tolerance band, the detected number of pulses is considered to be
correct.
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 control 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 control via
PROFIBUS / PROFINET as process data.
(e.g.: p2051[x] = r4688). The control can then set the contents of the counter to a specific
value.
is deactivated.
1)
1)
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
is output for 5
1)
r4689.1 = 1 is set.
Drive functions