The Fireye Interlock Annunciator Modules provide increased interlock supervision capability of the BurnerLogix System. The Interlock Annunciator Modules connect to any YB110 (YB230) or ZB110 (ZB230) BurnerLogix chassis/amplifier by means of a cable. By wiring any of twenty interlock switches into the Interlock Annunciator Module, the BurnerLogix display automatically acts as a "first-out" annunciator for those interlocks. In addition, a fuel selection circuit providing full annunciation even if two fuels are fired simultaneously is standard.