Programmable Logic Controls training day 1

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PLC ladder logic training guide

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  • The PLC performs the logic functions of relays, timers, counters and sequencers. It has the following advantages: 1) Low cost 2) Reliability 3) Reprogramability
  • The PLC inputs give it information about the machine or process that it is controlling. These are typically switches and sensors. The switches are connected to an input module that provides the interface between the switches or sensors and the PLC.Usually designed with opto – isolalators to protect the PLC
  • The PLC outputs are connected directly or indirectly (e.g. through a relay) to actuator controls. Examples include solenoids on directional control valves, motors, motor contactors, alarms and warning lights.Triac: Used mainly for Alternating Current conditions (requires some form of over current protection)Transistors: For fast switching (used for DC components only/ low voltage situations)
  • The wiring diagram in Fig 1.5 shows the inputs and outputs connected directly (hard wired) to the PLC. The devices shown are on/off or digital in nature but the signal to the PLC is analog. Many commonly used devices conform to a 4-20 mA standard whereby signals of 4mA and 20mA form respectively the minimum and maximum values of an analog signalWhat does analog signal in PLC imply ? It implies that a separate cable needs to be run between the end device and the control system because only a single analog signal can be represented on the circuit.
  • Programmable Logic Controls training day 1

    1. 1. ROLAND NIWAREEBA CERIANO MBIIKA EPHRAIM MALINGA 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    2. 2. PROGRAMMABLE LOGIC CONTROLLERS INTRODUCTION 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    3. 3. OBJECTIVES PROGRAMMING OPTIONS FOR PLCs LADDER DIAGRAMS • Statement Lists • Function Blocks • Digital Inputs / outputs • Analog Input / Outputs PLC Design, Simulation 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    4. 4. PROGRAMMING OPTIONS FOR PLCs PLC Basics Ladder Logic / Programming • RSLogix 5000 – • Micrex sx programming from Fuji Electric • i-TRILOGI (Ladder + BASIC) • SYSWIN 3.4 for OMRON C/C++ to PLC / Ladder Logic MATLAB LabVIEW (for NI cRIO, myRIO, myDAQ e. t. c) 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    5. 5. PLC Basics Function of a PLC Inputs and outputs Architecture and wiring of PLCs Network Protocols 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    6. 6. Function of a PLC Microprocessor based controller with various inputs and outputs 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    7. 7. Function of a PLC 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    8. 8. Inputs and Outputs • These are typically switches or sensors • Designed with opto – isolators 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    9. 9. Inputs and Outputs • Relays (volt free) • Triac • Transistors 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    10. 10. Architecture and Wiring Diagrams 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    11. 11. Architecture and Wiring Diagrams 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    12. 12. Network Protocols • Note nature in which I/O devices are connected • Note also they are either ON/OFF (hence digital in nature) • However, PLC I/O signals are analog (vary between 4 – 20mA) • What does this imply ? 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    13. 13. Standards used • Field bus: ASibus, Profibus, Devicenet and Modbus 4/17/2014
    14. 14. Hierarchy 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    15. 15. Bus Systems 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    16. 16. Review Questions 1.Switches, proximity devices and sensors are generally used in what way in a plc application? a) Relays b) Software elements c) Inputs d) Outputs 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    17. 17. Review Questions Study the diagram Below 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd
    18. 18. Revision Questions Pick the correct statement about it. a) When the power is switched on to the PLC all the N/O relay contacts are shown close b) The 24 V supply shown is used to power the plc itself. c) The plc energises an output by closing the relevant relay contact. d) When the plc outputs are energised they are al l latched on by the relay contacts shown 4/17/2014 Presented by Global Technocrats and Consultants (GTC) Ltd

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