GE Industrial Solutions Millennium II Controller J85501P-1 - Manual (Page 13)

Basic Installation and User’s Guide for the Millennium II Controller
Issue 3 January 2008 13
Figure 2-1: Controller Dimensions
Figure 2-2: Millennium Mounted on Cabinet Door
Controller Circuit Packs
MCR1 and MCR2
The core of the Galaxy Millennium II controller consists of a matched pair of surface
mount technology circuit packs, MCR1 and MCR2. These circuit cards are attached and
secured together at the factory. See Figure 2-3. The MCR1 is the larger of the two boards
and contains all the external input/output interfaces, local and remote user interface
circuitry, measurement circuits, real time clock, wide input range power converter, and
connections for the MCR2. The MCR2 contains the main 32-Bit 66MHz microprocessor