AS 4024.1100:2019 Safety of machinery
Safety-related parts of control systems — General principles for design
Part 1503 is a direct adoption of ISO 13849-1:2006. It specifies a process of developing a safety-related control system. It defines integrity requirements in terms of performance levels and categories [a discrete level used to specify the ability of safety-related parts of control systems to perform a safety function under foreseeable conditions; this can be mapped to a probability of dangerous failure similar to safety integrity level (SIL)] required for carrying out safety functions. It applies to all types of technology and energy used (electrical, hydraulic, pneumatic, mechanical, etc.). The performance levels together with the appropriate category, or the category selection alone (specified in Part 1501) may be used.
NOTE: SF-041 has decided not to adopt the ISO13849 -1: 2015 edition, since the committee decided that the level of safety of this edition of the standard has been lowered compared to the 2006 version by allowing, under certain conditons, the use of general purpose PLCs up to PLd.
Part 1601 is a direct text adoption of EN 953:1997+A1: 2009 (ISO 14120:2002), Safety of machinery — Guards — General requirements for the design and construction of fixed and moveable guards. Where ISO 12100:2003 and ISO 14121-1 are referred to, replace them with ISO 12100:2010 in Part 1201.
Part 1601 specifies the general requirements for the design and construction of guards provided primarily to protect persons from mechanical hazards. Attention is drawn to the use of guards to minimize exposure to non-mechanical hazards. The requirements are applicable if fixed and movable guards are used. This part does not cover those parts of guards that actuate interlocking devices. These are covered in AS/NZS 4024.1602. This part does not provide requirements for special systems such as rollover protective structures (ROPS) and falling-object protective structures (FOPS).
The Standard continues the practice of not specifying discrete strength characteristics for physical barriers. This supports the principle whereby the designer has the scope to choose from a range of materials that suit the overall design parameters. The critical issue is that, under all foreseeable operating conditions of use and misuse, the safety distances specified in Parts 1801 and 1803 are maintained. The practical application of this is that all designed or foreseen deflections of the physical barrier (whether fixed or movable) need to be added to the safety distances specified in Parts 1801 and 1803.