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PLC’s in the 21st
Century
Presented by Benjamin D. Miller, PE
Chicago/Rockford Consultants’ Network
March 30, 2009
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History
1968 General Motors specifies the design for a
“standard machine controller”
1969 Modicon develops first model- “box full of relays”
1970-1972 Allen-Bradley
1971-1973 GE & Omron
1970’s-1980’s Siemens, Mitsubishi, Koyo, others
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A/B PLC5
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A/B SLC500
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A/B Micrologix
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A/B Control Logix
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Hardware
Inputs: AC, DC Source/Sink
Outputs: AC triac, relay, DC transistor
Analog In: 0-5 V, 0-10V, 4-20 mA;12- bit
Analog Out: 0-5 V, 0-10V, 4-20 mA;10-12 bit
Communication: RS232, RS485, Modbus,
Device Net, etc.
High speed counter, motor drive, etc.
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Programming Methods
IEC 61131-3
Relay ladder logic
Function block diagram
Structured text
Instruction list
Sequential function block
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Ladder Logic
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Micrologix Functions
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Future
Advanced communication
Greater processing power
Smaller packages
Total automation control
Compatibility
Safety PLC
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