Siemens SINUMERIK 840D sl Function Manual page 446

Data descriptions
9.2 Parameters for SINAMICS S120
r9732[0...1] SI Motion velocity resolution
Displays the velocity resolution for the safe motion monitoring functions.
For index 0:
Displays the safe velocity resolution (load side). Specifications of velocity limits or
parameter changes for velocities below this threshold have no effect.
For index 1:
Displays the safe speed accuracy as a result of the safe encoder accuracy.
[0] = actual speed resolution
[1] = minimum speed resolution
Note regarding index 0:
This parameter does not provide any information about the actual accuracy of the
velocity sensing. This depends on the type of actual value sensing, the gear factors
as well as the quality of the encoder being used.
Conversion from:
(internal fixed value /Tsi) to mm/min (linear) or rpm (rotary) with Tsi = p9500 (SI
Motion monitoring cycle).
Example:
For Tsi = 12 ms, r9732[0] = 5 mm/min (linear) - or 1/72 rpm (rotary).
Note regarding index 1:
For a 2-encoder system with a non-safety-capable encoder alone, this signifies
the poorer value of the two encoders. Index[1] only takes into account the coarse
resolution of the encoder.
Internal calculation, which also incorporates the factor for the motor load side ver‐
sion, the gearbox ratio and the safety monitoring clock cycle. This results in mm/
min (linear) or rpm (rotary).
For safety without encoder, index 1 is not relevant - and always has a value of zero.
Unit: Default value:
rpm, mm/min -
r9744 SI message buffer changes, counter
Displays the changes of the safety message buffer.
This counter is incremented every time that the safety message buffer changes.
This is used to check whether the safety message buffer has been read out con‐
sistently.
See also r9747, r9748, r9749, p9752, r9754, r9755, r9756, r9759
Unit: Default value:
- -
r9745[0...63] SI component
Displays the component where the safety message occurred
Value = 0: An assignment to a component is not possible.
Unit: Default value:
- -
446
Minimum value: Maximum value:
- -
Minimum value: Maximum value:
- -
Minimum value: Maximum value:
- -
Checksum: Protection level:
No 3
Data type: Effectiveness:
FloatingPoint32 -
Checksum: Protection level:
- 3
Data type: Effectiveness:
Unsigned16 -
Checksum: Protection level:
- 3
Data type: Effectiveness:
Unsigned32 -
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated