4-53© Siemens AG 2008 All Rights ReservedSINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 EditionSafety Functions Integrated in the DriveNoteThis chapter describes the safety functions that are integrated in the drive – ”SafeTorque Off” (STO), ”Safe Brake Control” (SBC) and ”Safe Stop 1” (SS1), which arecontrolled via the drive terminals. The safety functions SH and SBC from thecontext of the safety–related motion monitoring functions are described in Chapter6 ”System/drive–integrated safety functions”. The SS1 safety function essentiallycorresponds there to STOP B. Control via terminals and from the motionmonitoring functions is in parallel and can be used independently of one another.4.1 General information about SINAMICS Safety Integrated4.1.1 Explanations and terminologyNoteIn this chapter, the NCU/NX is designated as ”Control Unit”.Two–channel monitoring structureAll the main hardware and software functions for Safety Integrated are imple-mented in two independent monitoring channels (e.g. shutdown signal paths, datamanagement, data comparison).The two drive monitoring channels are implemented as follows: via the Control Unit via the Motor Module/Power Module belonging to a drive.The monitoring functions in each monitoring channel work on the principle that adefined status must prevail before each action is carried out and a specificacknowledgement made after each action.4
