PLC Ladder Logic for simple ON-OFF of Motor and Lamp

Write ladder logic for the simple ON/OFF of motor and lamp.

Consider the following cases:

When

  • Switch 1 ON —— conveyor motor ON
  • Switch 2 and switch3 ON ——- lamp 1 ON & lamp2 ON
  • Switch 4 or switch5 ON —– conveyor motor OFF
  • Switch 6 ON —– lamp 1 OFF, lamp2 OFF

When you turn ON a switch 1 for the first time, conveyer motor should ON. When Switch 2 ON and switch 3 ON (Both are in ON Condition) should make Lamp 1 & 2 should go ON.

When Switch 4 or Switch 5 (Anyone ON) will make conveyor motor (Which was already turned ON by switch 1) should go OFF. When Switch 6 ON, will make lamps 1 & 2 (Which was already turned ON by switch 2 and switch 3) should go OFF.

Ladder Logic

Ladder Logic for simple ON OFF of Motor and Lamp

Logic Explanation

Network 1:

When switch 1 is pressed, the motor will turn on. Switch 4 and 5 are connected as normally closed contact in series with the output which will make output to go off when anyone goes ON.

Network 2:

Switch 2 and 3 are connected as normally open contact in series with the output which will make output lamp 1 and 2 to go ON only if both are ON. Switch 6 is connected as normally closed contact to break the power line when it goes ON.

Author: Hema

Training Course: Siemens PLC Training

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