The IM-10, System Sensor Ten Input Monitor Module is designed to meet a range of applications in which several individually addressable supervised inputs are needed, for use in Pertronic F100 and F120 Fire Alarm Systems. Each monitor module is intended to interface between a control panel and normally open contact devices. A common loop input is used for all ten modules, and the initiating circuits share a common supervisory supply. Otherwise, each monitor module operates independently from the others, having its own unique address. A pair of rotary code switches is used to set the address of the first module from 01 to 90. The remaining modules are automatically assigned to the next nine higher addresses. Provisions are included for disabling up to two of the highest addresses to release them to be used elsewhere. Each module also has panel controlled green LED indicators. The panel can cause the LEDs to blink, latch on, or latch off.