STOBER Glossary
05/2019 | ID 442790.01
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Safe Torque Off (STO)
In accordance with DIN EN 61800-5-2: Procedure for stopping a PDS(SR). The STO safety function prevents the motor
from being supplied with any energy that could cause rotation (or motion in a linear motor). The PDS(SR) does not
supply the motor with any energy that could generate torque (or force in a linear motor). STO is the most fundamental
drive-integrated safety function. It corresponds to an uncontrolled stop in accordance with IEC 60204-1, stop category
0.
Safety Integrity Level (SIL)
In accordance with DIN EN 61800-5-2: Probability of a safety function failure. SIL is divided into levels 1 – 4 (lowest –
highest level). SIL precisely assesses systems or subsystems based on the reliability of their safety functions. The higher
the SIL, the safer and more reliable the function in question is.
Self-discharge
Passive running process that causes the capacitors to discharge even when no electrical load is connected.
Serial number
Consecutive number stored for a product in STOBER's enterprise resource planning system and used for individual
identification of the product and for determining the associated customer information.
Single-ended (HTL/TTL)
In the context of signal transmission, electrical signal transmission takes place using a voltage that changes in relation
to a constant reference potential.
Synchronous operation
Synchronous movement of the individual axes in multi-axis systems.
Time between energizing two devices
Specified time span between two switching-on processes.
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