Copyright Goodheart-Willcox Co., Inc. 98 Programmable Logic Controllers: Hardware and Programming Motor +120 V I0 I1 I2 I3 I4 I5 I6 I7 I8 I9 I10 I11 I12 I13 I14 I15 Input ports Common O0 O1 O2 O3 O4 O5 O6 O7 O8 O9 O10 O11 O12 O13 O14 O15 Output ports Stop Start G Goodheart-Willcox Publisher Figure 6-17. Input/output connections for Figure 6-13. 0000 0001 0002 Stop Start Motor Motor Green light O:2 O:2 I:1 I:1 O:2 0 1 0 0 Motor O:2 0 1 End Goodheart-Willcox Publisher Figure 6-18. PLC ladder logic diagram for the relay logic diagram shown in Figure 6-13.