Safety engineering
Basics
Terms and abbreviations of the safety engineering
1
1.1
1.1.3
1.1-2
EDS94AYAD EN 2.2
1.1.3 Terms and abbreviations of the safety engineering
Abbreviation Meaning
9400 Lenze servo controller
EC_S0 Error-Class Stop 0
EC_S1 Error-Class Stop 1
EC_S2 Error-Class Stop 2
EC_FS Error-Class Fail-Safe
Cat. Category according to EN 954-1
OSSD Output Signal Switching Device, tested signal output
PS PROFIsafe
PWM Pulse width modulation
S-DI Safe input (Safe Digital Input)
S-DO Safe output (Safe Digital Output)
SIL Safety Integrity Level according to IEC 61508
SM Safety module
Optocoupler
supply
Supply of optocouplers to control the driver
OFF state Signal state of the sensors when they are activated or respond
ON state Signal state of the sensors in normal operation
Abbreviation Safety function
SDI Safe direction
SLI Safely limited increment
SLS Safely limited speed
SOS Safe operating stop
SS1 Safe stop 1
SS2 Safe stop 2
SSM Safe speed monitor
STO Safetorqueoff
Formerly: safe standstill
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