This European Standard specifies requirements, methods of test, and performance criteria for control and indicating equipment (see item B of figure 1 of EN 541) for use in fire detection and fire alarm systems installed in buildings. Amendment 1 to this standard improves the additional requirements for software controlled equipment and makes a number of miscellaneous changes, to correct errors and better reflect the current state of the art. It also replaces the descriptions of the individual electromagnetic compatibility immunity tests with a reference to the EMC Product Family Standard EN 50130-4, makes editorial and technical changes to generally improve clarity, and updates the normative references. Annex ZA with the relationship to the EU Construction Directive was amended.