Safe Direction Without Encoder - Siemens SINUMERIK MC Commissioning Manual

Safety functions integrated in the drive
4.12 SDI
Enabling the Safe Direction function
The "Safe Direction" function is enabled with p9501.17 = 1.
Figure 4-21 Functional principle SDI with encoder
4.12.1.2

Safe Direction without encoder

Note
You can find the parameterization for operation without encoder (p9506 = 1 or p9506 = 3) in
the commissioning screen form for the safety functional scope (Page 251).
Differences between Safe Direction with encoder and Safe Direction without encoder
● For Safe Direction without encoder, after pulse suppression the drive is unable to determine
the current speed. For this operating state, the behavior is defined using parameter p9509.8:
– p9509.8 = 1
– p9509.8 = 0
● Due to the less precise position recognition, "Safe Direction without encoder" requires a
larger tolerance (p9564) compared with the function with encoder.
156
The status signal displays "inactive".
The status signal displays "active", and the drive takes on the state STO.
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB