Safe Direction (Sdi) - Siemens SINUMERIK Series Function Manual

Overview of Safety Integrated functions
2.3 Safety Integrated Extended Functions
Figure 2-4
2.3.8

Safe Direction (SDI)

Definition
Definition according to EN 61800-5-2:
"The SDI function prevents that the motor shaft rotates in the unintended direction."
Examples of how the function can be used
● Tools, which when machining may only rotate in one direction.
● Retracting from a safe software limit switch.
How does SDI function in detail?
SDI monitors the actual direction of rotation.
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Time response of the safety function SSM (Safe Speed Monitor)
SDI
Function Manual, 10/2015, 6FC5397-3EP40-5BA3
Safety Integrated