System Protection Technology

This video presents the main features and advantages of PLCs, including hardware arrangements, software (i.e. programming) and typical applications. Extension of the PLC is discussed, noting features of a typical distributed control system

On completion of this videotape and associated workbook, the participant should be able to understand the following concepts, and apply them to day-to-day work activities

• Process logic & logic diagrams
• Hard-wired relay panels; control devices
• Advantages of PLCs
• Compact PLCs and rack mounted PLCs
• PLC elements
• Types of memory; RAM, ROM, EPROM
• Terminal connections; input-output image memory
• Input-output point address
• CPU operation, scanning time
• Nature of input and output signals; digital, analog
• Function of input and output interfaces
• Conditioning input and output signals
• Voltage sources for input and output signals
• Opto-isolators
• A/D and D/A conversion
• Output relays
• Transistor switching
• Protection against signal noise
• The external programming module
• Coding instructions
• Entering ladder logic
• Programming functions; timer, counter, latch
• Programming examples
• Troubleshooting with the programming module
• Extended PLC networks
• Interconnecting communication bus
• Distance limitations
• Input-output racks; local and remote
• Remote input-output blocks
• Distributed control system, SCADA
• Monitoring and programming the system