11 Appendix
11.1 Abbreviations
Abbreviation Description
Cat. Category (EN ISO 13849-1).
CCF Common cause failure (IEC 61508, IEC 62061, EN 61511-1, EN ISO 13849-1).
CCW Counterclockwise.
CW Clockwise.
DC Diagnostic coverage (EN ISO 13849-1, IEC 62061 (IEC61508-2)).
DIx DI1: Digital input 1.
DI2: Digital input 2.
EMC Electromagnetic compatibility.
F-DIO Fail-safe digital input and output.
F-PLC Fail-safe PLC
GSD General station description. A GSD file contains characteristics of an I/O device.
MFFT/MTTFd Mean time to failure/mean time to dangerous failure (EN ISO 13849-1).
OSSD Output signal switching device (EN 61496-1).
PDS(SR) Power drive system (safety related).
PELV Protective extra low voltage, low voltage with isolation. For more information: IEC 60364-4-41 or IEC 60204-1.
PFD Probability of failure on demand (IEC 61508, IEC 62061).
PFH Probability of failure per hour (IEC 61508, IEC 62061).
PLC Programmable logic controller.
PSD PROFIsafe driver.
PUST Power up self-test. Internal self-test on the safety option.
SF Safe function.
SIL Safety integrity level (IEC 61508, IEC 61800-5-2, IEC 62061).
SO Safety option.
SRECS Safety-related electrical control system (IEC 62061).
SRP/CS Safety-related part of control systems (EN ISO 13849-1).
Appendix
Installation Guide | VLT®Safety Option MCB 152
AN327351953089en-000101 / 130R0578
76 | Danfoss A/S © 2020.02
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