Basics Of Programmable Logic Controllers PLC.pptx

Basics of PLC
Presented By
Md. Mobarak Hossain
Assistant Engineer (Production)
Aftab Feed Production Ltd

 What is Programmable logic controller (PLC)
 Working Principal of ‘‘PLC System’’
 The Name Of Input Devices
 The Name Of Output Devices
 Logo PLC Module
 How Many Kinds of Input/Outputs
 Digital Input / Analog Input
 PLC Programing
 Maintenance schedule
 Key Points of PLC

 What is PLC ?
A PLC is Industrial Controlling device That Continuously Monitors
the state of Input devices and make decision based upon a
custom Program to Control the state of Output devices.
That’s the meaning of PLC ?
PLC means that Programmable Logic Controller.

 Working Principal of ‘‘PLC System’’

1. Push Switch
2. Limit Switch
3. Toggle Switch
4. Proximity Sensor
5. Pressure Switch
6. Level Switch
7. Temperature Sensor. etc.
The Name Of Input Devices

1. Magnetic Conductor
2. Relay
3. Solenoid Valve
4. Indicator lamp
The Name Of Output Devices

 Function block diagram
 Ladder diagram
 user-defined function (UDF)
PLC Programming Diagram

 This Notation for 0BA0,0BA1,0BA2,0BA3,0bA4,0BA5,0BA6
 Model PLC 0BA6 have 8 Input & 04 Outputs,
 Inputs Notation :-
I1,I2,I3,I4,I5,I6,I7,I8
 Outputs Notation :-
Q1,Q2,Q3,Q4
Siemens logo PLC Module

 Input.
 Digital Input
 Analog Input
 Output.
 Digital Output
 Analog Output
 Input & output of PLC

 TX and Rx are abbreviations for Transmit and Receive, Respectively.
Note that these metrics are referenced to the Server Being monitored ;
Transmit FROM this Server, and Receive to this server. Units are in Bytes
(not bit)
 TX and Rx

Digital Input
Push buttons Switch, Toggle Switch, Limit Switch,
Proximity Sensor Etc.
Analog Input
PT-100, Load Cell (0-10V or 4-20mA)
Digital Input & Analog Input

 Preventing Downtime: PLC failures can lead to unexpected downtime, causing
delays in production and affecting overall efficiency. Regular maintenance helps identify and
address potential issues before they escalate into significant problems, minimizing
unplanned downtime.
 Ensuring Safety: In industrial settings, PLCs often control critical processes and
machinery. Proper maintenance ensures that safety protocols are functioning correctly and
that emergency shutdown systems are operational. This helps prevent accidents and ensures
the well-being of personnel.
 Maximizing Performance: Regular maintenance keeps PLC systems operating at
their peak performance. By cleaning components, checking connections, and updating
firmware and software, you can optimize the system’s efficiency and responsiveness.
 Extending Equipment Lifespan: PLCs are a long-term investment for
businesses. Proper maintenance practices, such as cleaning, inspections, and preventive
maintenance, can extend the lifespan of PLC components and prevent premature failure.
This helps businesses save costs on frequent replacements.
Importance of PLC Maintenance

 Regular maintenance is essential to prevent unexpected downtime
and costly breakdowns. Here are some best practices for PLC
maintenance:
 Cleaning and Inspections: Dust, debris, and moisture can adversely affect
PLC performance. Regularly clean the PLC cabinet, paying attention to cooling fans
and vents. Inspect connections, cables, and terminals for signs of wear or corrosion.
 Firmware and Software Updates: Keep the PLC’s firmware and software up
to date to benefit from performance improvements, bug fixes, and security patches.
Ensure compatibility and test updates in a controlled environment before
implementation.
 Backup and Documentation: Create routine backups of PLC programs and
documentation, storing them securely offsite. This practice allows for swift recovery in case of a
hardware failure or accidental program loss.
Regular PLC Maintenance Practices

 Communication Failures: Check for loose or damaged
cables and connectors. Verify network settings and ensure
compatibility between devices.
 Faulty Inputs or Outputs: Inspect input/output modules and
wiring for loose connections or damaged components. Measure voltages and
currents to ensure proper functioning.
 Programming Errors: Carefully review the PLC program for
logical or syntax errors. Use debugging tools to identify and rectify
programming mistakes. Document changes to ensure proper version control.
Troubleshooting Common PLC Issues

 Easily Maintenance
 Fixed circuit operation
 Various communication
 Real-Time Operation
 Cost Effective
 Safety Features
 Programming
 Reliability (নির্ভরযোগ্যতা )
 Scalability
 Combination
 Remote Monitoring
 Advantages of PLC

Star Delta Connection
01. Set the direction control to neutral.
02. Start the forklift
03. Hand Break Unlock
04. Always approach the load slowly
and carefully

Basics Of Programmable Logic Controllers PLC.pptx

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