INEL 20040 Control Ladder Logic

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Last updated 5:56 PM on 4/28/26
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15 Terms

1
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What is the name of the logic circuit formed by placing two or more normally open (N.O.) switches in parallel?

OR Logic

2
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What is the output condition of an AND logic circuit?

The output is energized only when all input devices on the rung are activated.

3
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Which type of switch is typically used to form NOT logic?

Normally closed (N.C.) switch

4
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In an AND logic circuit, how are the switches connected?

Connected in Series

5
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What is the common use of NOT logic in control systems?

Emergency stop push buttons

6
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What is the best method for reading a ladder diagram?

Start at the upper left with the first input on the first rung, then work across the rung before moving to the next rung.

7
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What does a selector switch do in a control circuit?

It changes the operating mode of the machine.

8
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What is the purpose of an indicator lamp in a control system?

To indicate that the power is on, the cycle has begun, or that a dangerous condition is occurring.

9
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Electrical Control System

Senses inputs and makes decisions for a machine much like the brain and the nervous system for the human body

10
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6 rules of drawing a ladder logic diagram:

All components must be labeled

All conductors must be numbered

All lines must be numbered

Only show control devices

Place only one load per line

Output devices located on right

11
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AND logic circuit

Made it two normally open switches wired in series. Both switches must be closed to energize the output

12
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OR logic circuit

Made of 2 normally open switches wired in parallel. Closing either switches or both will energize the circuit

13
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NOT logic circuit

Made of one normally closed switch wired in series with the output. Pressing the switch will open the circuit.

14
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NOR logic circuit

Made of 2 normally closed switches wired in series. Opening either or both will de-energize the output

15
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NAND logic circuit

Made of two or more normally closed switches wired in parallel. Opening either if the switches will have no effect on the circuit. It is necessary to open all the switches to de-energize the output.