AS 7240.4:2018 pdf free
AS 7240.4:2018 pdf free.Fire detection and alarm systems
If the PSE is housed in the cabinet of other equipment within the FDAS (e.g. FDCIE), then manual controls, fuses, calibration elements, etc. for disconnection and adjustment of the power sources shall be accessible only by persons who are trained and authorized to maintain or repair the PSE in accordance with the manufacturer’s published instructions and data.
NOTE This corresponds to Access Level 3 or 4 as defined in ISO 7240-2 and ISO 7240-16.
If the PSE is not housed in the cabinet of other equipment within the FDAS (e.g. FDCIE), then manual controls, fuses, calibration elements, etc. for disconnection and adjustment of the power sources shall be accessible only by the use of a tool or key.
All manual controls, fuses, calibration elements and cable terminals shall be clearly labelled (e.g. to indicate their function, rating or reference to appropriate drawings).
If mandatory indicators required by other equipment within the FDAS (e.g. FDCIE) are repeated on a separately housed the PSE, then the indicators shall be in accordance with the requirements of the relevant equipment.
Where the PSE directly supplies power to functions of the FDAS and is not housed in the same cabinet as the other equipment, then an interface shall be provided for at least two transmission paths to the other equipment, such that a short circuit or interruption in one path does not prevent the supply of power.
The safe state should be defined by the manufacturer and should not give a false impression to a user that the PSE remains operational if it is not. In practice, it may be acceptable either to stop or automatically restart the program execution. If there is a possibility that the memory may have been corrupted, the restart procedure should check the contents of this memory and, if necessary, re-initialize the running data to ensure that the PSE enters a safe operating state. Even if program execution is successfully restarted, it is important that the user be made aware of the incident. For this reason, it could be advantageous for the PSE to be capable of automatically recording details of the restart event.AS 7240.4 pdf free.
