The AIB-716 Annunciator Input Board provides 16 dry contact inputs. Each input can be programmed to indicate the status of a switch or a contact within the LSN 2000 system. The switch or contact status can be used in I/O logic within the LSN 2000 system to activate or deactivate devices. The AIB-716 is controlled by the ACB-728 Annunciator Control Board. A maximum of eight AIB-716 daughter boards can communicate to an ACB-728.