Plc & scada
- 1. PLC & SCADA
- 3. PLC (Programmable Logic Controller) Basics – A PLC is a solid state device designed to perform logic functions previously accomplished by electro mechanical relays. – A PLC is a digital computer used for automation of electro mechanical processes such as control of machinery on factory assembly lines. – Basically a PLC is a assembly of solid state digital logic elements designed to make logical decisions and provide outputs. – PLC’s are used for control & operation of manufacturing process equipment & machinery.
- 4. PLC Block Diagram Rack & Chassis
- 5. PLC Components – C.P.U (Central Processing unit) – a) Microprocessor – b) Memory Unit – C) Power supply Module – Programming / monitors – I/O Modules – Rack & Chassis – Optional units
- 10. PLC power supply Module
- 11. PLC power supply Module
- 12. Advantages of PLC – Flexibility – Implementing Changes & Minimising errors – Large quantities of Contacts – Low Cost – Pilot Running – Visual Observation – Speed of Response – Ladder / Boolean Programming method – Reliability & Maintainability – Simplicity of Ordering Control Systems – Documentation – Security
- 13. –Newer technology –Environmental Condition –Fail Safe Operation –Fixed Programming Applications Dis-advantages of PLC
- 15. – Number of logical inputs and outputs – Size of memory required – Number of special I/O Modules required – Scan Time – Communications – Speed and power requirement of CPU and Instruction set – Software's – Manufacturers support and Backup Selection Criteria of PLC
- 16. Than “Q”