Siemens Sinumerik 840D sl Function Manual page 824

Appendix
A.4 Terms
Risk
Combination of the probability of damage occurring and the extent of the damage.
Safety
Free from any unacceptable risk.
Functional safety
The part of the safety of a piece of equipment (e.g. machine, plant) that depends
on the correct function.
Safety function
Function of a machine, whereby failure of a function (malfunction) can directly in-
crease the risk.
Safety functions of control systems
A function "initiated by an input signal and processed by the safety--related parts of
controls, that allows the machine (as system) to reach a safe condition".
Safety goal
To keep the potential hazards for personnel and the environment as low as possi-
ble without restricting more than absolutely necessary, industrial production, the
use of machines or the manufacture of chemical products.
Safety Integrity Level (SIL)
Measure, defined in EN 61508, for the safety--related performance of an electrical
or electronic control device.
Stop Category
Term used in EN 60204--1 to designate three different stopping functions.
Stopping
Function that is intended to avoid or reduce impending or existing hazards for per-
sonnel, damage to the machine or the execution of work. This has priority over all
operating modes.
A-824
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
© Siemens AG 2015 All Rights Reserved
10/15