Encoder Limit Frequency; Enabling The Safety-Related Functions - Siemens SINUMERIK 840D sl Function Manual

Basics regarding the safety functions integrated in the system/drive

6.5 Enabling the safety-related functions

6.4.7

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 "Safely reduced speed
(SG) (Page 137)").
Encoders with DRIVE-CLiQ interface are not monitored with respect to an encoder limit
frequency.
6.5 Enabling the safety-related functions
Global enable
SINUMERIK Safety Integrated (SI) with the safety-related functions is enabled using options.
The enable signal determines the number of axes/spindles for which SI can be activated. Using
an additional options, in addition, the number of possible SPL-SGEs/SGAs is defined.
The SH/SBC/SS1 function is completely implemented in SINAMICS S120 and is, as a function
integrated in the drive, included in the basic drive scope.
Enabling safety-related functions
Which safety functions are to be effective can be individually selected for each axis using the
following machine data:
For 840D sl
MD36901 $MA_SAFE_FUNCTION_ENABLE
(See Chapter "Machine data for SINUMERIK 840D sl (Page 311)").
For S120
p9501 SI Motion enable safety functions (Control Unit)
(See Chapter "Parameters for SINAMICS S120 (Page 394)").
The following functions can also be individually enabled:
● SBH/SG
● SE
● SN
● SG override
● Actual value synchronization
● External STOPs
● Cam synchronization
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Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated