The Raspberry Pi is being used in more automation applications as a PLC replacement. In this example, a Raspberry Pi 3 is being used as the main controller. The design spec called for: 16 Analog Inputs 4-20 mA 8 Digital Inputs 12 Relay Outputs for control 4 Analog Outputs 4-20 mA 120 VAC Prime Power 24 VDC Field Power Real TIme Clock Industrial Enclosure Here is a closer look at the interior panel: The enclosure is a BUD Industries ABS / Polycarbonate blend type with a clear cover and aluminum backpanel. The dimensions are 14