EET-123 Study Guide - Final Guide: Humber College, Truth Table, Unit
Document Summary
The and logic compares two or more instructions in series in a ladder rung. N. o. pushbuttons i:1/02 and i:3/05 both have to be pressed before light o:4/01 turns on. The truth table for a two input and logic is shown in fig. The or logic compares two or more instructions in parallel in a ladder rung. Either n. o. pushbutton i:1/03 or n. o. pushbutton i:3/02, when pressed will turn light o:2/04 on. The truth table for a two input or logic is shown in fig. Note: logic 0 = false, logic 1 = true. Unit 3 the basic start/stop control circuit. Start pushbutton i:1/02 , light o:4/03 turns on and stays on. Press n. c. stop pushbutton i:3/01, light o:4/03 turns off and stays off. The n. o. contact (xic instruction) in parallel with the start pushbutton instruction acts like a holding contact. Its address is the same as the address of the output instruction of the light: o:4/3.
