scope:

This Standard provides safety requirements and guidance on the principles for the design and integration of safety-related parts of control systems (SRP/CS), including the design of software. For these parts of SRP/CS, it specifies characteristics that include the performance level required for carrying out safety functions. It applies to SRP/CS, regardless of the type of technology and energy used (electrical, hydraulic, pneumatic, mechanical, etc.), for all kinds of machinery.

It does not specify the safety functions or performance levels that are to be used in a particular case.

This Standard provides specific requirements for SRP/CS using programmable electronic system(s).

It does not give specific requirements for the design of products which are parts of SRP/CS. Nevertheless, the principles given, such as categories or performance levels, can be used.

NOTE 1 Examples of products which are parts of SRP/CS: relays, solenoid valves, position switches, PLCs (programmable logic controllers), motor control units, two-hand control devices, pressure sensitive equipment. For the design of such products, it is important to refer to the specifically applicable Standards, e.g. JIS B 9712, JIS B 9717-1 and ISO 13856-2.

NOTE 2 For the definition of required performance level.

NOTE 3 The requirements provided in this Standard for programmable electronic systems are compatible with the methodology for the design and development of safety-related electrical, electronic and programmable electronic control systems for machinery given in JIS B 9961.

NOTE 4 For safety-related embedded software for components with PL_r = e see IEC 61508-3, clause 7.

NOTE 5 See also table 1.

NOTE 6 The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows.

ISO 13849-1: 2006 Safety of machinery-Safety-related parts of control systems-Part 1: General principles for design (IDT)

In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21-1.