Safety Integrated Functions
8.5 Safety Integrated Extended Functions
Function Manual
394 Function Manual, 01/2011, 6SL3097-4AB10-0BP3
8.5.10 Safe Direction (SDI)
8.5.10.1 Safe Direction with encoder
The Safe Direction function (SDI) allows reliable monitoring of the direction of motion of the
drive. If this function is activated, the drive can only move in the enabled, safe direction.
Functional principle
After SDI has been selected via terminals or PROFIsafe, the delay time p9365/p9565 is
started. During this period, you have the option of ensuring that the drive is moving in the
enabled (safe) direction. After this, the Safe Direction function is active and the direction of
motion is monitored. If the drive now moves in the non-safe direction, messages
C01716/C30716 are output and the stop response defined in p9366/p9566 is initiated.
Features
● Parameters r9720.12/r9720.13 display whether the SDI function is selected.
● Parameters rr9722.12/r9722.13 display whether the SDI function is active.
● Parameters p9364/p9564 are used to set the tolerance within which a movement in a
non-enabled (non-safe) direction is tolerated.
● Parameters p9366/p9566 define the stop response in the case of a fault.
● Parameters p10030/p10130 define the terminals for SDI.
● Parameter p10042 is used to define whether the SDI status in the status display of the
F-DO is taken into account.
● If "SDI positive" is selected, the following value is set automatically:
– r9733[1] = 0 (setpoint limitation negative)
● If "SDI "negative" is selected, the following value is set automatically:
– r9733[0] = 0 (setpoint limitation positive)
● The absolute setpoint speed limit is available in r9733[2].
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