AS NZS 4024.2803:2021 Safety of machinery Part 2803: Electro-sensitive protective equipment一General requirements and tests (IEC 61496-1:2020 (ED 4.0) MOD).
electro-sensitive protective equipment
assembly of devces and/or components working together for protective tripping or presence- sensing purposes and comprising as a minimum
— a sensing device;
— controlling/monitoring devices;
– output signal switching devices and/or a safety-related data interface
Note 1 to entry: The safety-related control system associated with the ESPE, or the ESPE itself, may further include a secondary switching device, muting functions, stopping performance monitor, etc. (see Annex A).
Note 2 to entry: A safety-related communication interface can be Integrated in the same enclosure as the ESPE.
external device monitoring
means by which the electro-sensitive protective equipment (ESPE) monitors the state of control devices which are external to the ESPE
termination of the ability of an item to perform a required function
Note I to entry: After failure the item has a fault.
Note 2 to entry: ‘Failure’ is an event, as distinguished from ‘fault’, which is a state.
Note 3 to entry: This concept, as defined, does not apply to items consisting of software only.
Note 4 to entry: In practice, the terms fault and failure are often used synonymously.
[SOURCE: IEC 60050-191:1990, 191-04-011
failure to danger
failure which prevents or delays all output signal switching devices going to, and/or remaining in the OFF-state in response to a condition which, in normal operation, would result in their so doing
state of an item characterized by inability to perform a required function, excluding the inability during preventive maintenance or other planned actions, or due to lack of external resources
Note 1 to entry: A fault is often the result of a failure of the item itself, but may exist without prior failure.
Note 2 to entry: In English the term TMfault” and its definition are identical with those given in IEC 60050-191:1990, 191-05-01. In the field of machinery, the French term “défaut” and the German term FehIer are used rather than the terms “panne” and “Fehlzustand” that appear with this definition.
[SOURCE: IEC 60050-191:1990, 191-05-011
final switching device
component of the machine’s safety-related control system that interrupts the circuit to the machine primary control element (MPCE) when the output signal switching device (OSSD) goes to the OFF-state.AS NZS 4024.2803 pdf download.