Introduction to the manual 29 Safety data (SIL, PL)SBC Safe brake controlSLS Safely-limited speed without encoderSS1 Safe stop 1SSE Safe stop emergencySSM Safe speed monitor without encoderSTO Safe torque off. See chapter The Safe torque off function (page 223).Supply unit The part of the drive that converts AC to DC for the motor. Consists of one or more supplymodules and their auxiliary components such as the LCL filter.Abbr. Reference DescriptionCat. EN ISO 13849-1 Classification of the safety-related parts of a control system in respectof their resistance to faults and their subsequent behavior in the faultcondition, and which is achieved by the structural arrangement of theparts, fault detection and/or by their reliability. The categories are: B, 1,2, 3 and 4.CCF EN ISO 13849-1 Common cause failure (%)DC EN ISO 13849-1 Diagnostic coverageFIT IEC 61508 Failure in time: 1E-9 hoursHFT IEC 61508 Hardware fault toleranceMTTF d EN ISO 13849-1 Mean time to dangerous failure: (The total number of life units) / (thenumber of dangerous, undetected failures) during a particularmeasurement interval under stated conditionsPFD IEC 61508 Probability of failure on demandPFH D IEC 61508 Probability of dangerous failures per hourPL EN ISO 13849-1 Performance level. Levels a…e correspond to SILSC IEC 61508 Systematic capabilitySFF IEC 61508 Safe failure fraction (%)SIL IEC 61508 Safety integrity level (1…3)SILCL IEC/EN 62061 Maximum SIL (level 1…3) that can be claimed for a safety function orsubsystemSS1 IEC/EN 61800-5-2 Safe stop 1STO IEC/EN 61800-5-2 Safe torque offT1 IEC 61508 Proof test interval. See also section Maintenance (page 231).Term/AbbreviationExplanation
