SLS switch (user-defined)1
FSO module, and FSE module2
Drive STO3
￭ Relevant failure modes
Relevant failure modes are:
• internal failures of the FSO module, the FSE module, and the drive STO.
These failures are included in the failure rate value of the function.
￭ Fault exclusions
Fault exclusions (not considered in the calculations):
• short and open circuits in the cables of the safety circuit
• short and open circuits in the cabinet terminal blocks of the safety circuits.
￭ Operation delays
Total delay: (less than) 500 ms (includes the response time of the drive STO).
Note: When using a safety encoder, you must add the delays of the encoder when defining
the total response time for the safety function and the fault reaction function.
Ambient conditions
For the environmental limits for the safety functions and the drive, refer to the drive hardware
manual, and to the FSO module user's manual.
Related standards and directives
NameStandard
Safety of machinery – General principles for design – Risk assessment and risk reductionEN ISO 12100:2010
Safety of machinery – Safety-related parts of control systems – Part 1: General principles
for design
EN ISO 13849-
1:2015
Safety of machinery – Safety-related parts of control systems – Part 2: ValidationEN ISO 13849-
2:2012
Safety of machinery – Electrical equipment of machines – Part 1: General requirementsEN 60204-1:2018
IEC 60204-1:2016
Electrical equipment for measurement, control and laboratory use - EMC requirements
- Part 3-1: Immunity requirements for safety-related systems and for equipment intended
to perform safety-related functions (functional safety) - General industrial applications
IEC 61326-3-1:2017
Functional safety of electrical/electronic/programmable electronic safety-related systems
- Part 1: General requirements
IEC 61508-1:2010
Technical data 63
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