Safely-Limited Position (Slp) - Siemens Sinamics S120 Function Manual

4.2.12

Safely-Limited Position (SLP)

The Safely-Limited Position function (SLP) is used to safely monitor the limits of two
traversing or positioning ranges which can be switched over by a safe signal.
Requirements
For the Safely-Limited Position function, the following requirements must be met:
● The use of one or two suitable encoders for the extended safety functions with encoder
(see also Section "Notes regarding safe actual value sensing using an encoder system
(Page 147)").
● Determining the absolute position of the drive by referencing during commissioning and
after all actions after which a safe absolute reference can no longer be guaranteed
(POWER ON, parking)
A description of safe referencing is provided in Section "Safe referencing (Page 127)".
Principle of operation
As soon as SLP is active, maintaining the limits of the active positioning range is safely
monitored. With a safety signal you can switch between 2 position ranges. Each position
range is limited by its previously defined limit switch pair. When passing the position of one
of the two limit switches, a parameterizable stop response (STOP A, STOP B, STOP C,
STOP D or STOP E) is initiated and the messages C01715 are output.
To acknowledge this fault, you can either switch over to a range whose limits have not been
violated, or you can deselect the SLP function. After acknowledgment, the drive can then be
traversed again in the permissible range.
Traversing in the permissible range can be realized in a safety-related fashion using the
"Retract" function (available for TM54F) (see Chapter "Retraction (Page 124)").
Features
● Selection via safe terminals (TM54F or onboard F-DI) or PROFIsafe
● Definition of the position range using 2 limit switch pairs (p9534 and p9535)
● Safe switchover between 2 different position ranges (not available for PROFIsafe
telegram 30)
● Adjustable stop response (p9562)
Enabling the Safely-Limited Position function
● The "Safety-Limited Position" function is enabled with p9501.1 = 1.
● After the enable, POWER ON at the converter.
Safety Integrated
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
121