The Context Plus XFP501E is a single-loop, 16-zone addressable fire alarm control panel certified to EN54-2/4 by the LPCB [citation:8][citation:12]. It is designed for small to medium installations and supports the C-TEC CAST protocol for addressable communication. The panel features a 2x40 character backlit LCD display, combined keypad/keyswitch entry for access levels 2 and 3, and an integral EN54-4/A2 switch mode power supply [citation:8][citation:14]. It includes two independently programmable conventional sounder circuits, two programmable inputs, and four relays (three programmable plus one fault relay) [citation:8]. The panel supports networking via RS485 (optional XFP761 card) for up to 8 panels or repeaters, and offers advanced functions such as zone dependency, day/night mode, investigation delay, and phased evacuation [citation:12][citation:14]. Key Features: LPCB certified to EN54 Parts 2 & 4; C-TEC CAST protocol; 1 loop driver, max 255 devices per loop, up to 1km loop length; 2 conventional sounder circuits (400mA max); 3 programmable relays + 1 fault relay (1A @ 30V DC); 2 programmable inputs (0V trigger, 27V max); 2x40 backlit LCD display with 16 zonal LEDs; Integral 1.4A EN54-4/A2 switch mode PSU; RS485 networking (optional) for up to 8 panels/repeaters; IP30 plastic enclosure (RAL7035); 999 event monitoring; Auto-learn loops; PC programming via RS232 (XFP507 kit). Industrial Uses / Applications: Small to medium commercial buildings (offices, shops); Schools, clinics, small hospitals; Single building installations with moderate fire detection needs; Retail premises, warehouses with limited zones; Projects where future expansion (networking) might be needed.