SIEMENS
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Siemens D 31 · 2015
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Function
Highlights
Safety Integrated
SINAMICS S120
The integrated safety functions of SINAMICS S120 provide
highly effective application-oriented protection for personnel
and machinery. They are suitable for machines and systems that
require flexible safety functions and support the setup of tailored
safety concepts.
SINAMICS S120 offers Extended Functions (SS2, SOS, SLS,
SDI, SSM, SLP, SP, SBT) in addition to Basic Functions (STO,
SS1, SBC).
The SP and SBT functions go beyond the functional scope
according to IEC 61800-5-2.
The Safety Integrated functions are fully integrated in the drive
system. They can be activated as follows:
•
Via safety-related inputs on the CU310-2 Control Unit
•
Via safety-related inputs on the TM54F Terminal Module
•
Via PROFIBUS or PROFINET with the PROFIsafe profile
The Safety Integrated functions are implemented electronically
and therefore offer short response times compared to solutions
with externally implemented monitoring functions.
As an alternative to controlling via terminals and/or PROFIsafe,
there is also the option to parameterize several safety functions
without selection. In this mode, after parameterization and a
POWER ON, these functions are permanently selected.
Example:
"SLS without selection" can be used, for example, to monitor the
maximum velocity to prevent the drive from exceeding a mechan-
ical speed limit. For this purpose, using the "without selection"
function, an F-DI does not have to be used; an F-CPU is also not
required.
Safe speed/position sensing
Incremental encoders or absolute encoders can be used for safe
sensing of the position values on a drive. Safe actual value sens-
ing relies on redundant evaluation of the incremental tracks A/B
that supply sin/cos signals of 1 V
pp
. Only encoders of the type
whose A/B track signals are created and processed using purely
analog techniques can be used. The encoder signals can be
input via the Sensor Modules SMC20, SME20/25 or SME120/125.
HTL/TTL encoders can be used in a 2-encoder system to
achieve safe actual value sensing. The minimum possible speed
resolution must also be taken into account. The encoder signals
are input via the SMC30 Sensor Module.
As an alternative, motors with an integrated DRIVE-CLiQ inter-
face can be used. The speed or position actual values are gen-
erated directly in the motor as safe values and are transferred to
the Control Unit over safe communication via DRIVE-CLiQ.
The encoder must be mechanically attached in such a manner
that the encoder shaft is unable to unplug or slide off. For notes
on this, see IEC 61800-5-2: 2007, Table D.16.
A list of Siemens motors that fulfill the electrical and mechanical
requirements is available at:
The following can be used for safe speed/position sensing:
•
Single-encoder systems or
•
2-encoder systems
Single encoder systems
In a single-encoder system, the motor encoder is used exclu-
sively for safe actual value sensing.
2-encoder systems
The safe actual values for a drive are provided by two separate
encoders. The actual values are transferred to the Control Unit
over DRIVE-CLiQ. When motors without a DRIVE-CLiQ connec-
tion are used, a Sensor Module (SMC20, SME20/25/120/125)
must be provided.
Each measuring system requires a separate DRIVE-CLiQ
connection.
Safe actual value sensing without encoder
The Extended Functions Safe Stop 1 (SS1) with SAM/SBR, Safely
Limited Speed (SLS), Safe Speed Monitor (SSM) and Safe Direc-
tion (SDI) are also available for use without encoders (in combi-
nation with asynchronous (induction) motors and SIEMOSYN
motors). An encoder that is used for the purposes of motor con-
trol has no significance for the safety function here. The encoder-
less safety functions can be implemented on request for chassis
format units.
The Safety Integrated Function Manual contains additional
information about the encoderless safety functions.
The Extended Functions Safe Stop 2 (SS2), Safe Operating Stop
(SOS), Safely Limited Position (SLP), Safe Position (SP) and Safe
Brake Test (SBT) always require a safe encoder system.
Licensing
The Safety Integrated Basic Functions do not require a license.
The Safety Integrated Extended Functions do require a license.
It is of no consequence here which safety functions are used and
how many. The license can be ordered as an option with the
memory card. Alternatively, a single-user license can also be
purchased.
© Siemens AG 2014