11
GLOSSARY
SIL The security integrity level is a
measure for quantifying the risk
reduction. Term used in the safety
technology (EN 61508 -1...7).
SS1 Safety function „Safe stop 1“ in ac-
cordance with IEC 61800-5-2
SSI Synchronous serial interface for
encoder
STO Safety function „Safe Torque Off“ in
accordance with IEC 61800-5-2
TTL Incremental signal with an output
voltage up to 5 V
USB Universal serial bus
VARAN Real-time Ethernet bus system
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