rev C: as first quoted by Screaming Circuits and General Circuits rev D: 3/15/17 (1) changed components J3, J4, J5 to smaller terminals. Previous ones did not actually fit the PCB layout. (2) swapped J12 for a Sullins header (3) gave 2 options for the trimpot R44 (4) changed the trace to LCD power so it can be controlled by PLC digital out (5) cleanup up some thermal relief pads on PTH parts to include an annular ring rev E: 3/30/17 based on General Circuits DFM check: 1) moved C10 to avoid interference with J16 2) adjusted footprint of C13 and C31 to proper pad spacing.