Ladder Diagram Symbols

Study the various symbols identified in this presentation.

Once you have memorized the different symbols and can name them, take the flashcard quiz,

separate from this program

N.O. Push Button

N.C. Push Button

N.O. & N.C. Push Button

Knife Switch / Toggle Switch

N.O. Limit Switch

N.O. Limit Switch Held Closed

N.C. Limit Switch

N.C. Limit Switch Held Open

Input Symbols

L R

N.O. Pressure Switch

N.C. Pressure Switch

N.O. Float Switch

N.C. Float Switch

N.O. Temperature Switch

N.C. Temperature Switch

Three Way Selector Switch

N.O. On Delay Contact

N.C. On Delay Contact

N.O. Off Delay Contact

N.C. Off Delay Contact

N.O. Contact

N.C. Contact

Normally Open Proximity Switch

Normally Closed Proximity Switch

R

F

Indicator Light

Motor Coil, Forward

Solenoid

R Motor Coil, Reverse

CR Control Relay Coil

TR Timer Relay Coil

Output Symbols

Other Symbols

Fuse

Transformer

Ground

Overload

Buzzer

Horn/Alarm

Bell

EXIT

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