Abbreviations; Tüv Certificate - ABB ACS880-104 Hardware Manual

328 The Safe torque off function
• STO fault indication (parameter 31.22) delay: < 500 ms
• STO warning indication (parameter 31.22) delay: < 1000 ms
￭

Abbreviations

Abbr. Reference
Cat. EN ISO 13849-1
CCF EN ISO 13849-1
DC EN ISO 13849-1
HFT IEC 61508
MTTF EN ISO 13849-1
D
PFD IEC 61508
avg
PFH IEC 61508
PL EN ISO 13849-1
SC IEC 61508
SFF IEC 61508
SIL IEC 61508
SILCL IEC/EN 62061
STO IEC/EN 61800-5-2
T IEC 61508-6
1
T EN ISO 13849-1
M
￭ TÜV certificate
The TÜV certificate is available on the Internet at www.abb.com/drives/documents.
Description
Classification of the safety-related parts of a control system in respect
of their resistance to faults and their subsequent behavior in the fault
condition, and which is achieved by the structural arrangement of the
parts, fault detection and/or by their reliability. The categories are: B,
1, 2, 3 and 4.
Common cause failure (%)
Diagnostic coverage
Hardware fault tolerance
Mean time to dangerous failure: (Total number of life units) / (Number
of dangerous, undetected failures) during a particular measurement
interval under stated conditions
Average probability of dangerous failure on demand, that is, mean
unavailability of a safety-related system to perform the specified safety
function when a demand occurs
Average frequency of dangerous failures per hour, that is, average
frequency of a dangerous failure of a safety related system to perform
the specified safety function over a given period of time
Performance level. Levels a...e correspond to SIL
Systematic capability
Safe failure fraction (%)
Safety integrity level (1...3)
Maximum SIL (level 1...3) that can be claimed for a safety function
or subsystem
Safe torque off
Proof test interval. T is a parameter used to define the probabilistic
1
failure rate (PFH or PFD) for the safety function or subsystem. Per-
forming a proof test at a maximum interval of T
the SIL capability valid. The same interval must be followed to keep
the PL capability (EN ISO 13849) valid.
See also section Maintenance.
Mission time: the period of time covering the intended use of the safety
function/device. After the mission time elapses, the safety device must
be replaced. Note that any T
guarantee or warranty.
is required to keep
1
values given cannot be regarded as a
M