Siemens SINUMERIK 840D sl Manual page 179

Interconnection between NCU and NX components
● After activating the infeed, given correct operation, the "Infeed operation" state will be
Line contactor control
Note
The SINAMICS ("Safe Standstill" and "Safe Brake Control") safety functions satisfy the
requirement for safety integrity level 2 (SIL2) in accordance with IEC 61508. This
corresponds to the control category 3 in accordance with DIN EN 954-1 and DIN VDE 0801.
The "Safe Standstill" function prevents an unwanted starting from standstill of the motor
connected to the drive device.
The need for a line contactor for the safe separation of the energy supply to the motor is no
longer assured.
● The line contactor is controlled from the "Line contactor control" function (NCU terminal
Guide for the SINUMERIK 840D sl machine configuring
Manual, 07/2006 Edition, 6FC5397-6CP10-0BA0
attained and all axes (BI: p0864) will be enabled. This status must also be forwarded to
the NX components (NCU terminal X132.7 and NX terminal X122.1).
X132.10). The signal state for the line contactor (make contact) can be returned (NCU
terminal X132.4). This control ensures that the line contactor always switches in a defined
manner and so prevents overloading or damaging the line contactor and/or the infeed.
Notice
The described control must be locked by the safety controller in accordance with the
required safety category.
Signal Interconnection
6.4 Application 4
6-11