Study the following PLC Logic Ladder and answer following questions: 1. How many

Question

Study the following PLC Logic Ladder and answer following questions: 1. How many input signals this program is processing? 2. How many timers are used in this program? Which 'bit' number is being examined for "Push Button 1"? . Which 'bit' number is being examined for "Limit Switch 1"? 5. If you want to build this program in the lab, which terminal number of the PLC you should use to connect Motor 1"? 6· "Push Button 1" is pressed, what will happen to "Light 1" and "Motor 1" after 3 minutes? 7· "Push Button 1" is pressed, what will happen to "Light 1" and "Motor 1" after 4 minutes? 8. Modify the program such that "Limit Switch 1" can stop "Motor 1 if actuated Push Button 1 I:0 Timer On Delay Timer Time Base 1 Preset Accum T4:0 200 Limit Switch 1 I:0 Timer On Delay Timer Time Base .0 Preset Accum 200 Light 1 0:0 T4:0 T4:1 Motor 1 0:0 T4:0 DN T4:1 DN

Explanation / Answer

1- There are only 2 input signals I.e push button 1 and limit switch.

2-There are 2 on delay timers as shown.

3-Bit number 0 is examined for pushbuttons as there are generally 8 bits for inputs i.e from 0 to 7 . For 1st input bit number 0 is used and for 2nd bit 1 is used and so on.

4-Bit number 1 is examined for limit switch

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