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Siemens PLC Training: Motor Start and Stop Ladder Logic PLC Program | PLC Programming Examples
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In previous parts of this Siemens PLC programming course, you gained a good understanding of the PLC programming basics.
In Part 1, you learned how to configure the PLC hardware in TIA Portal V15.1.
In Part 2, you learned how to write a Ladder Logic PLC program for a simple Water Pumping System and how to control the level of the water tank in that process.
In Part 3, you learned how to simulate our PLC program using the PLC simulator or PLCSIM.
In Part 4 (this part) of the PLC programming course, we'll continue with another simple PLC programming example and you'll learn how to write a ladder logic PLC program to start and stop an electric motor using Siemens TIA portal.
Remember that you don't need any actual hardware to participate in this course. So having a laptop with a TIA Portal installed on that would be enough! In most of the examples, you can use Step 7 and WinCC instead of TIA Portal.
Same as always, first, we have to calculate the number of inputs and outputs of the process to and from the PLC cards. We have two pushbuttons, one for starting and the other for stopping the electric motor.
Each of these pushbuttons has an indicator lamp inside to signal the condition of the motor to the operator.
Therefore, we have two inputs to our digital input card from the pushbuttons and another input from the contactor’s auxiliary contact.
We use the input from the auxiliary contact of the contactor in our PLC program as feedback for the electric motor status. Is it ON or OFF?
By the way, we have three outputs as well. One is for turning ON and OFF the electric motor and the other two are for turning ON and OFF the indicator lamps of the pushbuttons.
Sometimes where it’s possible, we should use a proximity sensor on the shaft of the motor to make sure if the motor is really running and it’s not stocked by any means.
In this way, as long as the proximity sensor’s input to the PLC card is getting ON/OFF with a certain frequency, we are sure that the motor is working.
Another point that you'll learn in this video is that: one of the important automation documents or drawings that is used frequently during commissioning and troubleshooting of processes is the “Control Panel Wiring Diagram” in which we can find the power and control sections of the process.
But the electrical schematic that you see in this video actually does not really count as a wiring diagram, but it’s a simple schematic drawing for a better understanding of the concepts.
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SECTIONS of this video:
0:00 What will you learn in this PLC programming example?
0:39 How many PLC cards do we need? (PLC Signals Quantity)
1:31 What should we do before PLC Programming?
1:46 Start/Stop motor control Ladder Diagram PLC Program
3:01 PLC Logic NO and NC contacts VS Actual NO and NC contacts
3:30 Simulate PLC Program
4:37 Contactor's Auxiliary Contact in PLC Program
5:00 How to check motor rotation by a Proximity Sensor
5:24 Electrical Schematic VS Wiring Diagram
5:58 What will you learn in the next videos?
===========================
▶ If you've missed our most recent videos, watch them here:
Wiring Diagrams Explained | How to Read Electrical Diagrams
What is a Directional Control Valve? (5/2 Solenoid Valve)
NO vs NC: 5 Practical and Important Points about NO and NC contacts
===========================
▶ If you want to become a confident PLC programmer, don't miss this free "Siemens PLC Training" course (This course will be continued):
Part 1: Up & Running with PLC Ladder Programming
Part 2: How to Write PLC Ladder Program?
Part 3: How to Simulate the PLC Program?
Part 4: Motor Start and Stop Ladder Logic PLC Program
===========================
FOLLOW US on other Social Media
===========================
#plcladderlogic #plcprogram #plcprogramming
In previous parts of this Siemens PLC programming course, you gained a good understanding of the PLC programming basics.
In Part 1, you learned how to configure the PLC hardware in TIA Portal V15.1.
In Part 2, you learned how to write a Ladder Logic PLC program for a simple Water Pumping System and how to control the level of the water tank in that process.
In Part 3, you learned how to simulate our PLC program using the PLC simulator or PLCSIM.
In Part 4 (this part) of the PLC programming course, we'll continue with another simple PLC programming example and you'll learn how to write a ladder logic PLC program to start and stop an electric motor using Siemens TIA portal.
Remember that you don't need any actual hardware to participate in this course. So having a laptop with a TIA Portal installed on that would be enough! In most of the examples, you can use Step 7 and WinCC instead of TIA Portal.
Same as always, first, we have to calculate the number of inputs and outputs of the process to and from the PLC cards. We have two pushbuttons, one for starting and the other for stopping the electric motor.
Each of these pushbuttons has an indicator lamp inside to signal the condition of the motor to the operator.
Therefore, we have two inputs to our digital input card from the pushbuttons and another input from the contactor’s auxiliary contact.
We use the input from the auxiliary contact of the contactor in our PLC program as feedback for the electric motor status. Is it ON or OFF?
By the way, we have three outputs as well. One is for turning ON and OFF the electric motor and the other two are for turning ON and OFF the indicator lamps of the pushbuttons.
Sometimes where it’s possible, we should use a proximity sensor on the shaft of the motor to make sure if the motor is really running and it’s not stocked by any means.
In this way, as long as the proximity sensor’s input to the PLC card is getting ON/OFF with a certain frequency, we are sure that the motor is working.
Another point that you'll learn in this video is that: one of the important automation documents or drawings that is used frequently during commissioning and troubleshooting of processes is the “Control Panel Wiring Diagram” in which we can find the power and control sections of the process.
But the electrical schematic that you see in this video actually does not really count as a wiring diagram, but it’s a simple schematic drawing for a better understanding of the concepts.
===========================
===========================
SECTIONS of this video:
0:00 What will you learn in this PLC programming example?
0:39 How many PLC cards do we need? (PLC Signals Quantity)
1:31 What should we do before PLC Programming?
1:46 Start/Stop motor control Ladder Diagram PLC Program
3:01 PLC Logic NO and NC contacts VS Actual NO and NC contacts
3:30 Simulate PLC Program
4:37 Contactor's Auxiliary Contact in PLC Program
5:00 How to check motor rotation by a Proximity Sensor
5:24 Electrical Schematic VS Wiring Diagram
5:58 What will you learn in the next videos?
===========================
▶ If you've missed our most recent videos, watch them here:
Wiring Diagrams Explained | How to Read Electrical Diagrams
What is a Directional Control Valve? (5/2 Solenoid Valve)
NO vs NC: 5 Practical and Important Points about NO and NC contacts
===========================
▶ If you want to become a confident PLC programmer, don't miss this free "Siemens PLC Training" course (This course will be continued):
Part 1: Up & Running with PLC Ladder Programming
Part 2: How to Write PLC Ladder Program?
Part 3: How to Simulate the PLC Program?
Part 4: Motor Start and Stop Ladder Logic PLC Program
===========================
FOLLOW US on other Social Media
===========================
#plcladderlogic #plcprogram #plcprogramming
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