Copyright Goodheart-Willcox Co., Inc. 120 Programmable Logic Controllers: Hardware and Programming L AB ACTIVIT Y 6A Programming a PLC Station This lab activity can be found in the Lab Manual as Lab Activity 6-2. Objective In this activity, you will connect input and output devices to PLC input/output ports for two relay ladder diagrams. Then, you will create two PLC ladder logic diagrams and verify their operation. Equipment • Allen-Bradley SLC 500 series PLC trainer • Single-pole, single-throw (SPST) switches (2) • Limit switch • Normally open pushbuttons (2) • Red and green pilot lights • Split-phase AC induction motor (fractional horsepower) Procedure Activity 1 Examine the relay ladder diagram in Figure 6A-1. In this diagram, the green pilot light (Green_PLT) turns on when switch one (SW1) is closed. The red pilot light (Red_PLT) turns on when switch one (SW1) and switch two (SW2) are both closed. In this activity, you will program the relay logic diagram for this illustration and then test the circuit. R G SW1 SW2 Red_PLT Green_PLT L1 L2 Figure 6A-1. Relay Ladder Diagram Step 1 Assign the input/output ports as indicated in the following: • Switch one (SW1) to input port address I:0/0. • Switch two (SW2) to input port address I:0/3. • Green pilot light (Green_PLT) to output port address O:0/3. • Red pilot light (Red_PLT) to output port address O:0/4.