In this session, you will learn: Ladder Logic Examples Motor starter Motor starter with limit switch

1. Industrial Automation
Training
Session 06 – Ladder Logic –
Exercises

2. Page 1Classification: Restricted
Ladder Logic Examples
• Motor starter
• Motor starter with limit switch
Agenda

3. Page 2Classification: Restricted
Ladder Logic- Motor Starter Example
1. What are inputs
2. What is output
3. Latching is required ?
4. What truth table to be deployed ?
5. IO list

4. Page 3Classification: Restricted
Ladder Logic- Motor Starter Example

5. Page 4Classification: Restricted
Ladder Logic- Motor Starter Expansion

6. Page 5Classification: Restricted
TIMERS
• ON-Delay
• OFF DELAY

7. Page 6Classification: Restricted
TIMERS
• Retention ON delay
In the following example a tank will be filled with two
chemicals, mixed, and then drained. When the Start Button is
pressed at input I0.0, the program starts pump 1 controlled by
output Q0.0. Pump 1 runs for 5 seconds, filling the tank with
the first chemical, then shuts off. The program then starts pump
2, controlled by output Q0.1. Pump 2 runs for 3 seconds filling
the tank with the second chemical. After 3 seconds pump 2
shuts off. The program starts the mixer motor, connected to
output Q0.2 and mixes the two chemicals for 60 seconds. The
program then opens the drain valve controlled by output Q0.3,
and starts pump 3 controlled by output Q0.4. Pump 3 shuts off
after 8 seconds and the process stops. A manual Stop switch is
also provided at input I0.1.

8. Page 7Classification: Restricted
Ladder Logic- MIXING USING TIMERS
A tank will be filled with two chemicals, mixed, and then drained. When the Start Button is pressed at
input I0.0, the program starts pump 1 controlled by output Q0.0. Pump 1 runs for 5 seconds, filling the
tank with the first chemical, then shuts off. The program then starts pump 2, controlled by output
Q0.1. Pump 2 runs for 3 seconds filling the tank with the second chemical. After 3 seconds pump 2
shuts off. The program starts the mixer motor, connected to output Q0.2 and mixes the two chemicals
for 60 seconds. The program then opens the drain valve controlled by output Q0.3, and starts pump 3
controlled by output Q0.4. Pump 3 shuts off after 8 seconds and the process stops. A manual Stop
switch is also provided at input I0.1.

9. Page 8Classification: Restricted
Conveyor Example
When load is more than a
200LBS – Conveyor A

10. Page 9Classification: Restricted
What is firmware?
ROM
RAM
NVRAM
What is difference between RS232 & RS-485
PLC Memory

11. Page 10Classification: Restricted
Topics to be covered in next session
SCADA at application level
•Elements of SCADA
•Technology behind
•Implementation

12. Page 11Classification: Restricted
Thank you!