Siemens SINAMICS S120 Installation And Start-Up Manual page 174

SINAMICS Safety Integrated (Booksize)
Application examples
Notice
This example describes the implementation options available. The solution
required for the machine must be in accordance with the machine function, which
means that parameters and control commands are defined individually.
Notice
The fault responses and output functions (e.g. inversion or simulation) must not be
changed or activated with respect to the factory setting.
Function description
With two SIGUARD safety combinations for emergency stop and the protective
door, as well as a standard PLC, the system can be configured according to
EN 954-1, category 3, and EN1037. The drives are brought to a standstill in accor-
dance with stop category 1 to EN 60204-1.
S The "Safe standstill" safety function, which is integrated in the drive, complies
with category 3 to EN 954-1 and SIL 2 to IEC 61508. The non-safe message
"Safe standstill active" is sufficient.
S Safety combinations for emergency stop and protective door monitoring comply
with category 4 (instantaneous enable circuits) or category 3 (delayed enable
circuits).
S The electric circuits for emergency stop and protective door monitoring are
monitored for cross-circuits on two channels.
S Switches S4, S5, and S6 are position switches with positive-opening operation
to EN 1088.
S Being a higher-level circuit with contacts, the "Safe standstill" function also
works if the PLC malfunctions or fails.
S I/O communication via the digital interface between the drive and PLC can also
be replaced by non-safe standard communication (e.g. PROFIBUS).
S Electrical isolation is not essential for the emergency stop function.
A higher-level line contactor is not required. When work is carried out on the
motor or converter, the voltage is disconnected via a main circuit-breaker (that
can be terminated).
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E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition