plc development 2010g michael kellow kathleen manuel james kemp
TRANSCRIPT
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PLC Development 2010gMichael Kellow
Kathleen ManuelJames Kemp
www.2010g.info
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Overview
• Description• Scope• Current Progress
• Communication• Software• Hardware
• Future Plans2
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PLC’s Control the World
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PLC Industries
• Water & Waste Treatment• Electricity Generation and Distribution• Mining• Manufacturing• Pharmaceuticals• Golf Clubs
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What makes a PLC
Programmable Logic Controller
• Simple Logic Controller• Reliable• Extendable• Versatile
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PLC vs PC or Micro
• Less Errors in Programming• High Reliability• Compatibility with Hardware and
Instuments
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PLC Range
16 Major PLC Manufacturers
Many Smaller Manufacturers
Not Compatible with each other
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Scope
Research, develop and construct an industry standard PLC (programmable logic controller)
for teaching purposes.
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Current Progress
PLC Development
Communications Protocol Software Hardware
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Communications Protocol
Some of the factors that will help determine which type of protocol to use:
• cost• redundancy• speed• repeatability• maintainability
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Communications Protocol
Modbus • Developed by Modicon• Standard communications protocol in industry• Widespread use of Modbus in industry mainly due to:
– Cost – Maintainability
Image taken from: www.rtaautomation.com/modbustcp11
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Communications Protocol
Ethernet/IP• Developed by Rockwell Automation (Allen-Bradley)• Designed for use in process control and other automation
applications
Image taken from: ethernetgateways.com12
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Current Progress Software
• Kernel Design• SLC 500 Commands• Closed Source• PID Control• Ladder Logic Interpreter
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Ladder Logic
[ I2 AND NOT (O3) ] OR [ O3 AND NOT (I2) ] = Output 214
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Programming
RS Logix 50015
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Hardware
Enclosure
Processor Module
Communications Modules
Expansion and I/O Modules
Power Supply
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Future Goals
http://www.wastechcontrols.com/images/plc.jpg17
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Questions