Encoder Limit Frequency - Siemens Sinumerik 840D sl Function Manual

Basics on the safety functions integrated in the system/drive
5.4 Actual value conditioning
Boundary conditions
The two SI actual positions no longer display the correct absolute machine posi-
tion. The correct position can now only be read out via the NC actual position.
The safety monitoring functions SG, SBH, SBR and "n<n
actual value changes from the particular actual value acquisition channel -- not to
changes in the actual value resulting from the actual value synchronization. A
single--channel SG violation only initiates an alarm in the channel in which this
speed violation was detected. The associated stop response is therefore still initia-
ted through two channels.
SGA "n<n
Note
It is not possible to activate the safe SE and SN functions for an axis/spindle
where slip can occur between the motor and the load.
Activation
The actual value synchronization is selected by setting bit 3 in machine data 36901
$MA_SAFE_FUNCTION_ENABLE or parameter p9501:" SI Motion, enable safety--
related functions". In addition, SI function "SBH/SG monitoring" must also be ena-
bled.
Actual value synchronization is only permissible if a monitoring function with abso-
lute reference has not been simultaneously enabled. If SE and/or SN are also se-
lected, power on Alarms 27033 and F01688 are also output when booting.
The actual value synchronization is only permissible for 2--encoder systems. If this
function is enabled for a single--encoder system, Alarm 27033/F01688 is output.
5.4.7

Encoder limit frequency

The encoder limit frequency is fixed at 500 kHz. This value is secured through the
crosswise data comparison between the NCK and drive.
Monitoring the speed to ensure that it does not exceed the encoder limit frequency
is carried out using the SMI, SMC and SME Sensor Modules (see Chapter 6.5
"Safely reduced speed").
Encoders with DRIVE--CLiQ interface are not monitored with respect to an encoder
limit frequency.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
" can also assume different static states in the two monitoring channels.
x
" still only respond to
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