A PSM 3.2 power supply module is installed in each extension rack to provide power to all the hardware modules in the extension rack. It communicates with the primary controller rack and other extension racks through the use of the dedicated DEIF internal communication ports.
The extension rack status and alarms activate the PSM's three relay outputs. There are two ports for internal communication with the main controller. PSM3.2 manages the hardware module self-checks for the rack and includes a power LED. The power supply terminals include circuit protection against load dump transients and JEM177 surge transients (rugged design). These terminals also include battery voltage measurement.