Siemens SCM-8 Switch Control ModuleSiemens SCM 8 Switch Control Module is a Siemens FireFinder XLS option module that provides manual control of the Emergency Voice Evacuation System or Manual Fire System Control. Each Model SCM 8 module provides eight (8) momentary push button switches and 16 LEDs to indicate their status. Each switch is assigned two (2) LEDs and a label to indicate the switch's programmed usage. Each Model SCM 8 module is mounted on a hinged panel as a part of the