1. PLC Concepts Timing Diagram: Vertical Light Red Y0 Yellow Y1 Green Y2 Horizontal Light Red Y20 Yellow Y21 Green Y22 5 Sec 25 Sec SFC Figure: 5 Sec S0 M1002 S20 Y0 S30 Y22 T0 T10 S21 Y2 S31 M1013 T1 S22 T11 S32 Y21 Y22 T2 M1013 Y2 T12 S23 Y1 S33 Y20 T13 S0 1-17 25 Sec 5 S ec 5 Sec TMR T0 K350 MR T10 K250 MR T11 K50 TMR T1 K250 TMR T2 K50 MR T12 K50 MR T13 K350