SIEMENS
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Siemens PM 21 · 2017
Safety Integrated
Overview
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Function
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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 con-
figured software limit switches is safely monitored. If the permit-
ted traversing range is exited, a configurable fault reaction
occurs. It is possible to toggle between two traversing ranges,
even when the machine is in operation.
Application
SLP is used for applications in which machine operators have to
enter a protection area, e.g. for feeding in and removing mate-
rial. Safe monitoring of the axis position ensures that the axis
cannot move into the protection area 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 for highly-effective protection area monitoring.
The function does away with the use of external components
such as hardware limit switches and the associated wiring
expense. Due to the short reaction time following a limit over-
shoot, safety clearances can be reduced.
Note:
The SLP function is not available for SINAMICS S110.
Safe Position (SP)
The SP function transfers the actual position values determined
safely in the drive over safe PROFIsafe communication to a
safety control.
Effect
In contrast to the SLP function that monitors the current actual
position value against a limit and, in the case of an overshoot,
activates a drive-integrated fault reaction, SP transfers the
current actual position values to the safety control. Position mon-
itoring is implemented in the safety program of the control.
Extended PROFIsafe telegrams are available for transferring the
position values. The position values can be transferred in 16-bit
or 32-bit resolution, as required. A time stamp is also transferred
with the position values.
Application
Tailor-made safety concepts can be created using the SP func-
tion. It is ideal for use on machines that require flexible safety
functions. It is extremely versatile and can be used, for example,
to implement safe, axis-specific range detection by means of
safe cams. The SP function can also be used to implement multi-
axis safety concepts, multi-dimensional protection areas and
zone concepts.
Customer benefits
Position monitoring or speed monitoring is implemented in the
safety program of the control, so the user has the flexibility for im-
plementing tailor-made safety functions. The reaction to a limit
overshoot must also be specified in the safety program. This
means a higher initial programming outlay, but it does offer the
opportunity for initiating different fault reactions.
Note:
The SP function is not available for SINAMICS S110.
Basic Functions and Extended Functions
The Safety Integrated functions for SIMOTION D and
SINAMICS S110/S120 are grouped into Basic Functions and
Extended Functions.
The Basic Functions are included in the standard scope of
supply.
The Extended Functions must be activated by a license.
•
Basic Functions
- Safe Torque Off (STO)
- Safe Brake Control (SBC)
- Safe Stop 1 (SS1)
•
Extended Functions
- Safe Stop 1 (SS1) with SBR or SAM
- Safe Stop 2 (SS2) with SBR or SAM
- Safe Operating Stop (SOS)
- Safely Limited Speed (SLS)
- Safe Speed Monitor (SSM)
- Safe Direction (SDI)
- Safely Limited Position (SLP)
- Safe Position (SP)
- Safe Brake Test (SBT) diagnostic function
With the Extended Functions SS1 and SS2 with SAM, Safe
Acceleration Monitoring (SAM) is performed during braking to
ensure that a fault is detected already during the braking phase.
With SS1 and SS2, a Safe Brake Ramp (SBR) can be configured
as an alternative.
The Basic Functions – activated via on-board terminals on the
device, TM54F Terminal Module or via PROFIsafe – do not
require an encoder.
SLP
s
t
G_D211_XX_00310
SP
G_D211_XX_00309a
© Siemens AG 2017