SIEMENS
SINAMICS S150 NEMA
Engineering Information
3
Siemens D21.7
(Part 2) – 2015
Safety Integrated – Description of functions
(continued)
SDI
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Safely-Limited Position (SLP)
SLP
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Safe Direction (SDI)
The SDI function ensures that the drive can only move in
the selected direction.
Effect
Deviation from the direction of motion currently being
monitored is detected reliably and the configured drive-
integrated fault reaction is initiated. It is possible to select
which direction of rotation is to be monitored.
Application
The SDI function is used when the drive may only move in
one direction. A typical application is to permit the operator
access to a danger zone, as long as the machine is rotating
in the safe direction, i.e. away from the operator. In this
state, the operator can feed material into the work zone /
remove material from the work zone without danger.
Customer benefits
The function does away with the use of external
components such as speed monitors and the associated
wiring expense. The release of a danger zone, i.e. while
the direction of machine rotation is away from the operator,
increases productivity. Without the SDI function, the
machine would need to be safely stopped during material
loading and removal.
Safe Direction (SDI)
Safely-Limited Position (SLP)
The SLP function monitors the axis to ensure that it remains
within the permissible traversing range.
Effect
When SLP is activated, the traversing range limited by the
configured software limit switches is safely monitored. If
the axis exits the permitted traversing range, a customizable
fault reaction is initiated. It is possible to toggle between two
traversing ranges, even when the machine is in operation.
Application
SLP is used for any application which requires a machine
operator to enter a protection zone, e.g. in order to load
or remove material. Safe monitoring of the axis position
ensures that the axis cannot move into the protection zone
released for operators and so place them in danger, for
example, on storage and retrieval machines, gantry cranes
or machining centers.
Customer benefits
SLP can be used to implement highly-effective protection
zone monitoring. The function does away with the use of
external components such as hardware limit switches and
the associated wiring expense. Thanks to the fast response
to limit-value violations, safety clearances can be reduced.
Safely-Limited Position (SLP)