Introduction to the manual 27
Safety related
control function
(SRCF)
Control function implemented by a SRECS with a specified integrity
level that is intended to maintain the safe condition of the machine or
prevent an immediate increase of the risk(s)
Safety related
electrical control
system (SRECS)
Electrical control system of a machine whose failure can result in an
immediate increase of the risk(s)
Safety system Whole safety system including for example human interface, FSO
safety functions module, drive, sensors and machine.
SAR Safe acceleration range. In the FSO module, there are two sets of SAR
parameters (SAR0 and SAR1) that are used to define and/or monitor
the deceleration ramp in safety functions. SAR0 parameters are used in
the SSE function. SAR1 parameters are used in SS1, SLS, varSLS and
SDI functions.
SBC Safe brake control
SC Systematic capability (IEC 61508)
Scaling speed A user-defined value that the FSO module uses as a speed reference
point in ramp time calculations. See parameter 200.202 SAR speed
scaling on page 404.
SDI Safe direction
SELV Safety extra-low voltage
SFF Safe failure fraction (%) (IEC 61508)
SFRT Safety function response time (see page 26)
SIL Safety integrity level (1…3) (IEC 61508, IEC 62061, IEC 61800-5-2)
SLS Safely-limited speed
SMS Safe maximum speed
SS1 Safe stop 1
SS1-r Safe stop 1 ramp monitored
SS1-t Safe stop 1 time controlled
SSE Safe stop emergency
For example, safety fieldbus failure, speed monitoring trip limit hit (SLS
and SMS), and direction monitoring limit hit (SDI) will activate the SSE
safety function.
SSM Safe speed monitor
SRECS Safety related electrical control system (see page 27).
Status word 16-bit word from device to controller with bit-coded status messages.
Term /
Abbreviation
Description
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