Power Supply Module (115/230 Vac 8 A) (1 slot) The Power Supply Modules (PSM) provide power to operate the Logic Manager and I/O card files. The PSM is installed in slots J and K in the Logic Manager card file and either slot M or L and M in the I/O card module. Five models of power supply modules are available, two for use in the Logic Manager card file and three for use in the I/O card file.