BS EN 61131-6:2012

INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Conformance to this standard
5 FS-PLC safety lifecycle
6 FS-PLC design requirements specification
7 FS-PLC design, development and validation
8 FS-PLC architecture
9 HW design, development and validation planning
10 FS-PLC SW design and development
11 FS-PLC safety validation
12 FS-PLC type tests
13 FS-PLC verification
14 Functional safety assessment
15 FS-PLC operation, maintenance and modification
   procedures
16 Information to be provided by the FS-PLC
   manufacturer for the user
Annex A (informative) - Reliability calculations
Annex B (informative) - Typical FS-PLC Architectures
Annex C (informative) - Energise to trip applications
        of FS-PLC
Annex D (informative) - Available failure rate databases
Annex E (informative) - Methodology for the estimation
        of common cause failure rates in a multiple
        channel FS-PLC
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

Defines requirements for programmable controllers (PLCs) and their associated peripherals, as defined in Part 1, which are intended to be used as the logic subsystem of an electrical/electronic/programmable electronic (E/E/PE) safety-related system.

IEC 61131-6:2012 specifies requirements for programmable controllers (PLCs) and their associated peripherals, as defined in Part 1, which are intended to be used as the logic subsystem of an electrical/electronic/programmable electronic (E/E/PE) safety-related system. A programmable controller and its associated peripherals complying with the requirements of this part is considered suitable for use in an E/E/PE safety-related system and is identified as a functional safety programmable logic controller (FS-PLC). An FS-PLC is generally a hardware (HW) / software (SW) subsystem. An FS-PLC may also include software elements, for example predefined function blocks.