In this article, you will learn the PLC programming example on timers function block using switch and lamps.
Note: The PLC example logic presented is for educational resource for engineering students and technicians to learn the basics.
PLC Programming Example on Timers
Problem Statement
Design a PLC ladder logic for the following application.
We are using one toggle switch to control two lamps.
When Switch 1 is ON, then
- Lamp 1 will be ON for 10 seconds.
- Lamp 2 will be ON after 10 seconds.
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I/O List
Digital Inputs:
The list of digital inputs shown below.
Switch 1: I0.0
Digital Outputs:
The list of digital outputs shown below.
Lamp 1: Q0.0
Lamp 2: Q0.1
Ladder Logic
PLC Program Description
Here we used Normally Open Contact for Switch 1 (I0.0).
Timer Function Block Type TP is used for Lamp 1 and Time Function Block Type TON is used for Lamp 2.
In Rung 0:
1) Normally Open Contact is used for Switch 1 to Turn ON Lamp 1.
2) Timer Function Block type TP is used to Turn OFF Lamp 1 after Set time.
In Rung 1:
1) Normally Open Contact is used for Switch 1 to Turn ON Lamp 2.
2) Timer Function Block type TON is used to delay the time of Lamp 2 to Turn ON.
When Switch 1 is ON, the signal will flow through Switch 1 as Normally Open Contact is used for Switch 1 and Lamp 1 will Turn ON for 10 seconds because Timer Function Block type TP is used for Lamp1 and time is set for 10 sec.
After 10 seconds, Lamp 2 will Turn ON in Rung1 as Timer Function Block type TON is used for Lamp 2 to delay the turning ON and time is set for 10 sec.
Simulation Results
Here we show the PLC logic simulation results.
When Switch 1 is ON
When Switch 1 is turned ON, Lamp 1 will Turn ON for 10s in Rung 0 as Timer Function Block Type TP is used for Lamp 1.
After 10 seconds, Lamp 1 will Turn OFF and Lamp 2 will Turn ON in Rung 1 because Timer Function Block Type TON is used for Lamp 2 which will delay the time of Lamp 2 to Turn ON for Set time.
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