1 of 10

LADDER DIAGRAM

2 of 10

  • Graphical representation of a program generally written in langs like C or LadderLogic
  • Quite similar to a ladder

3 of 10

Rails: placed vertically

​

Rungs: placed horizontally (b/w power rails)

4 of 10

How switch works

Mainly 2 configurations:

Normally – Open: allows current flow when activated

Normally – Closed: blocks current flow when activated

5 of 10

  • Perform ON, OFF and AND operations
  • Can make any logic using these, fundamentally logic is binary

6 of 10

How output-coil works

Gets energised when conditions are met and activates a real world system

Possible output systems: motors, lights/ indicators, and alarms

7 of 10

ADVANTAGES

  • Visual representation of rungs reduce maintenance
  • Allows real time monitoring of system status
  • Widely accepted by engineers and technicians

8 of 10

DISADVANTAGES

  • Not suitable for data processing
  • Not suitable for time based problems
  • Can face problems in complex control systems

9 of 10

    • Manufacturing control to control diff machinery to sort items, quality control and packaging
    • Can control pressure, chemical balance in water
    • Widely used in food packaging and beverage processing

APPLICATIONS

10 of 10

THANK YOU