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March 2008
ISA Tampico, Mexico
Programmable Controller:
The Start of It All
PLC History
PLC History
PLC History
PLC History
PLC History
PLC History
Bedford Associates
 Skiing and Harley
 Out of the company
 Retired 1964?
 Contract engineering
 20 professionals
1968
 New Year’s Day
 Hangover
 Late again
 Similarity across applications
 Lazy
Philosophy #1
 Heat
 Electricians
 Never off
 Over-engineered
 Coke proof
 Make money while I sleep
Philosophy #2
 Heat
 Memory
• Shannon
 Snapshot
 Grab – process – ship
• Intermodulation effects
Hardware #1
 No fans
 Conductive cooling
 Viewing the thermo world with copper
 Sealed
 Spark immunity – welding?
 Stunt – memory – process
Hardware #2
 No “off” switch
 Looks good to manufacturing
 Power voltage insensitive
 Rugged
 Cost is a bad word
Software
 For the electrician
• For the problem, not the academics
 Sample rate a constant
• Problem speed – not computer speed
• Quantum thinking
• A lump of energy in the power
Language #1
 Language
 Memory
• Shannon
 Hard real time
 Never wanted to repair
 Come from, not go to
 RLL
Language #2
 Standalone lines of logic
 No interrupt
 Relay, not Boolean
 Constant scan, independent of activity
 Only four contacts per line
 We got no respect from MIT
PLC History
Market #1
 Not a computer
• Erased boards
 Started – CNC – not another piece of
colored sheet metal
 Angel – never original product
 Low hanging fruit – Ford
Market #2
 What is it?
• Box of relays – relays complexity
constrained
 Time to market
• Months to weeks
 Runs “forever”
Money
 Digital – Anderson – airport
 VC
 Almost failed
President
 Board chair
 Tech – Fletcher
 Sales – Rousseau
 Money – Kramer
• Paint story
Manufacturing #1
 The box
• Temp and spark
 Always on
 Harwood
 Big boards
 Move people
Manufacturing #2
 Real quality
 Overnight at temp
 Running in the box
Users
 GM story
• PDP – 16
• Never knew
 GE story
 Landis grinding
• Plane and crash – welding cable
• Japan – Yaskawa and Toyota
Competition
 After the fact
 GE OEM by Modicon
 Odo Struger
• Management vs. tech
 PDP-II, RT II
 Relays – backup?
Me
 Never an employee
 Temp president for
several weeks
 084 to 184
(Morley to Greenberg)
 Number and name –
job and Schwenk
 Machinist and physicist
PLC History
My Guiding Principle

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PLC History

  • 1. March 2008 ISA Tampico, Mexico Programmable Controller: The Start of It All
  • 8. Bedford Associates  Skiing and Harley  Out of the company  Retired 1964?  Contract engineering  20 professionals
  • 9. 1968  New Year’s Day  Hangover  Late again  Similarity across applications  Lazy
  • 10. Philosophy #1  Heat  Electricians  Never off  Over-engineered  Coke proof  Make money while I sleep
  • 11. Philosophy #2  Heat  Memory • Shannon  Snapshot  Grab – process – ship • Intermodulation effects
  • 12. Hardware #1  No fans  Conductive cooling  Viewing the thermo world with copper  Sealed  Spark immunity – welding?  Stunt – memory – process
  • 13. Hardware #2  No “off” switch  Looks good to manufacturing  Power voltage insensitive  Rugged  Cost is a bad word
  • 14. Software  For the electrician • For the problem, not the academics  Sample rate a constant • Problem speed – not computer speed • Quantum thinking • A lump of energy in the power
  • 15. Language #1  Language  Memory • Shannon  Hard real time  Never wanted to repair  Come from, not go to  RLL
  • 16. Language #2  Standalone lines of logic  No interrupt  Relay, not Boolean  Constant scan, independent of activity  Only four contacts per line  We got no respect from MIT
  • 18. Market #1  Not a computer • Erased boards  Started – CNC – not another piece of colored sheet metal  Angel – never original product  Low hanging fruit – Ford
  • 19. Market #2  What is it? • Box of relays – relays complexity constrained  Time to market • Months to weeks  Runs “forever”
  • 20. Money  Digital – Anderson – airport  VC  Almost failed
  • 21. President  Board chair  Tech – Fletcher  Sales – Rousseau  Money – Kramer • Paint story
  • 22. Manufacturing #1  The box • Temp and spark  Always on  Harwood  Big boards  Move people
  • 23. Manufacturing #2  Real quality  Overnight at temp  Running in the box
  • 24. Users  GM story • PDP – 16 • Never knew  GE story  Landis grinding • Plane and crash – welding cable • Japan – Yaskawa and Toyota
  • 25. Competition  After the fact  GE OEM by Modicon  Odo Struger • Management vs. tech  PDP-II, RT II  Relays – backup?
  • 26. Me  Never an employee  Temp president for several weeks  084 to 184 (Morley to Greenberg)  Number and name – job and Schwenk  Machinist and physicist