Functional safety. Safety instrumented systems for the process industry sector - Framework, definitions, system, hardware and application programming requirements1 Scope This part of IEC 61511 gives requirements for the specification, design, installation, operation and maintenance of a safetyinstrumented system (SIS), so that it can be confidently entrusted to achieve or maintain a safe state of the process. IEC 615111 has been developed as a process sector implementation of IEC 61508: 2010. In particular, IEC 615111: a) specifies the requirements for achieving functional safety but does not specify who is

This International Standard applies to machines equipped with the standard linkage as defined by the manufacturer

Operator A responds by rejecting responsibility for the alarm condition

It is recommended that users of this standard consult the national legislation related to this transposition in order to identify the national regulations and requirements

MRS classification of materials in pipe form

the agency responsible for maintaining and publishing the 'Agreed RMI Terminology')

— refrigerated or frozen

electrical circuits

the interlayer distance

friction coefficients and lifetime of a foil thrust bearing

Protective coating options

Power engineering (cooling and general-purpose water supply)

BS ISO 4574:2019 has been editorially revised throughout