AS 7240.22:2018 pdf free.Fire detection and alarm systems Part 22: Smoke-detection equipment for ducts (ISO 7240-22:2017, MOD).
4.5 Manufacturer’s adjustments
It shall not be possible to change the manufacturer’s settings except by special means (e.g. the use of a special code or tool) or by breaking or removing a seal.
4.6 On-site adjustment of response behaviour
4.6.1 If there is provision for on-site adjustment of the response behaviour of the SDED, then
a) for all of the settings at which the manufacturer claims compliance with this document, the SDED shall comply with the requirements of this document and access to the adjustment means shall be possible only by the use of a code or special tool or by removing the SDED from its base or mounting;
b) any setting(s) at which the manufacturer does not claim compliance with this document shall be accessible only by the use of a code or special tool, and it shall be clearly marked on the SDED or in the associated data that if these setting(s) are used, the SDED does not comply with this document.
4.6.2 These adjustments may be carried out at the SDED, the detector or the control and indicating equipment.
4.7 Requirements for software-controlled smoke-detection equipment for ducts
4.7.1 General
The requirements of 4.7.2 and 4.7.3 shall be met for SDED that rely on software control in order to fulfil the requirements of this document.
4.7.2 Software design
In order to ensure the reliability of the SDED, the following requirements for software design shall apply.
a) The software shall have a modular structure.
b) The design of the interfaces for manually and automatically generated data shall not permit invalid data to cause an error in the program operation.
c) The software shall be designed to avoid the occurrence of deadlock of the program flow.
4.7.3 Storage of programs and data
4.7.3.1 The program necessary to comply with this document and any preset data, such as manufacturer’s settings, shall be held in non-volatile memory. Writing to areas of memory containing this program and data shall be possible only by the use of some special tool or code and shall not be possible during normal operation of the detector.AS 7240.22 pdf download.