2.4.1. STO Standards
describes and specifies the safety requirements at the system level for the Safe Torque Off
(STO) feature of the XC4. This assumes that diagnostic testing is performed according to
and
.
Table 2-28:
STO Standards
Standard
Maximum Achievable Safety
EN/IEC 61800-5- 2:2016
SIL 3
EN/IEC 61508-1:2010
SIL 3
EN/IEC 61508-2:2010
SIL 3
EN ISO 13849-1:2015
Category 4, PL e
EN/IEC 62061:2005 with Amendments
SIL 3
Table 2-29:
STO Standards Data
Standard
Value
EN ISO 13849-1:2015
MTTF
D
> 1000 years,
DC
AVG
99%
Maximum PL e, Category 4
EN ISO 13849-1:2015
EN/IEC 61508
Lifetime = 20 years
No proof test required
Interval for manual STO test:
l
Once per year for SIL2/PL d/category 3
l
Once per three months for SIL3/PL e/category 3
l
Once per day for SIL3/PL e/category 4
EN/IEC 61508
SIL3
PFH < 3 FIT
SFF > 99%
2.4. Safe Torque Off Input (STO)
XC4 Hardware Manual
62
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Summary of Contents for Automation1 XC4
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