PLC Development 2010g Michael Kellow Kathleen Manuel James Kemp

Overview Description Scope Current Progress Communication Software Hardware Future Plans 2

PLC’s Control the World 3

PLC Industries Water & Waste Treatment Electricity Generation and Distribution Mining Manufacturing Pharmaceuticals Golf Clubs 4

What makes a PLC Programmable Logic Controller Simple Logic Controller Reliable Extendable Versatile 5

PLC vs PC or Micro Less Errors in Programming High Reliability Compatibility with Hardware and Instuments 6

PLC Range 16 Major PLC Manufacturers Many Smaller Manufacturers Not Compatible with each other 7

Scope Research, develop and construct an industry standard PLC (programmable logic controller) for teaching purposes. 8

Current Progress PLC Development Communications Protocol SoftwareHardware 9

Communications Protocol Some of the factors that will help determine which type of protocol to use: cost redundancy speed repeatability maintainability 10

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: 11

Communications Protocol Ethernet/IP Developed by Rockwell Automation (Allen-Bradley) Designed for use in process control and other automation applications Image taken from: ethernetgateways.com 12

Current Progress Software Kernel Design SLC 500 Commands Closed Source PID Control Ladder Logic Interpreter 13

Ladder Logic [ I 2 AND NOT (O 3 ) ] OR [ O 3 AND NOT (I 2 ) ] = Output 2 14

Programming RS Logix

Hardware Enclosure Processor Module Communications Modules Expansion and I/O Modules Power Supply 16

Future Goals 17

Questions