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CPU block diagram                    2
Functional interaction of a PLC system                                         3
Multiprocessor Configuration                               4
PLC Total Scan Representation                                5
Illustration of a signal that will not bedetected by a PLC during a normal scan                                           ...
PLC scan with immediate I/O updateThese immediate instructions are very useful when the PLC mustreact instantaneously to a...
Typical PLC subsystem configuration                                      8
Error Detection and Correction•More sophisticated programmable controllersmay have an error detection and correctionscheme...
CPU DIAGNOSTICS•The processor is responsible for detectingcommunication failures, as well as other failures, thatmay occur...
THE SYSTEM POWER SUPPLY                          11
A typical Miniprogrammer     and a Small PLC                           12
A Removable Memory Card  for a Miniprogrammer                          13
PLC Ladder Diagram Displayed on a       Personal Computer                                    14
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Typical discrete input/output system                                       17
Internal switches used to set I/O addresses                                              18
Master racks(a) without I/O modules       (b) with I/O modules                                                     19
Local Rack Configuration                           20
Remote Rack Configuration                            21
Specifications for the I/O Rack Enclosure                                            22
23
Remote I/O Configurations(a) Daisy chain            (b) Star           (c) Multidrop                                      ...
DISCRETE INPUTS                  25
Block diagram of an AC/DC input circuit                                          26
Device connections(a) an AC input module          (b) a DC input module                                                   ...
DC INPUTS (SINK/SOURCE)•A DC input module can interface with field devices in bothsinking and sourcing operations, a capab...
Field device connections for a sink/source             DC input module                                             29
Conversion circuit interfacing a sinking output        with a sourcing input module                                       ...
ISOLATED AC/DC INPUTSIsolated input interfaces operate like standard AC/DC modulesexcept that each input has a separate re...
TTL INPUTSTransistor-transistor logic (TTL) input interfaces allow controllersto accept signals from TTL-compatible device...
REGISTER/BCD INPUTS•Multibit register/BCD input modules enhance input interfacingmethods with the programmable controller ...
DISCRETE OUTPUTS                   34
AC OUTPUT Circuit Block Diagram                                  35
AC output module connection diagram                                      36
DC OUTPUTS (SINK/SOURCE)                           37
ISOLATED AC AND DC OUTPUTS                             38
TTL OUTPUTS              39
REGISTER/BCD OUTPUTS                       40
CONTACT OUTPUTS                  41
DISCRETE BYPASS/CONTROL STATIONS                                   42
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Plc (processors and dio)

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Transcript of "Plc (processors and dio)"

  1. 1. 1
  2. 2. CPU block diagram 2
  3. 3. Functional interaction of a PLC system 3
  4. 4. Multiprocessor Configuration 4
  5. 5. PLC Total Scan Representation 5
  6. 6. Illustration of a signal that will not bedetected by a PLC during a normal scan 6
  7. 7. PLC scan with immediate I/O updateThese immediate instructions are very useful when the PLC mustreact instantaneously to a critical input or output. 7
  8. 8. Typical PLC subsystem configuration 8
  9. 9. Error Detection and Correction•More sophisticated programmable controllersmay have an error detection and correctionscheme that provides greater reliability thanconventional error detection.•The key to this type of error correction is themultiple representation of the same value. 9
  10. 10. CPU DIAGNOSTICS•The processor is responsible for detectingcommunication failures, as well as other failures, thatmay occur during system operation.•It must alert the operator or system in case of amalfunction.•The processor performs diagnostics, or error checks,during its operation and sends status information toindicators that are normally located on the front of theCPU.•Typical diagnostics include memory OK, processor OK,battery OK, and power supply OK.•Some controllers possess a set of fault relay contactsthat can be used in an alarm circuit to signal a failure. 10
  11. 11. THE SYSTEM POWER SUPPLY 11
  12. 12. A typical Miniprogrammer and a Small PLC 12
  13. 13. A Removable Memory Card for a Miniprogrammer 13
  14. 14. PLC Ladder Diagram Displayed on a Personal Computer 14
  15. 15. 15
  16. 16. 16
  17. 17. Typical discrete input/output system 17
  18. 18. Internal switches used to set I/O addresses 18
  19. 19. Master racks(a) without I/O modules (b) with I/O modules 19
  20. 20. Local Rack Configuration 20
  21. 21. Remote Rack Configuration 21
  22. 22. Specifications for the I/O Rack Enclosure 22
  23. 23. 23
  24. 24. Remote I/O Configurations(a) Daisy chain (b) Star (c) Multidrop 24
  25. 25. DISCRETE INPUTS 25
  26. 26. Block diagram of an AC/DC input circuit 26
  27. 27. Device connections(a) an AC input module (b) a DC input module 27
  28. 28. DC INPUTS (SINK/SOURCE)•A DC input module can interface with field devices in bothsinking and sourcing operations, a capability that AC/DC inputmodules do not have.•Sinking and sourcing operations refer to the electricalconfiguration of the circuits in the module and field inputdevices.•If a device provides current when it is ON, it is said to besourcing current.•If a device receives current when it is ON, it is said to be sinkingcurrent. 28
  29. 29. Field device connections for a sink/source DC input module 29
  30. 30. Conversion circuit interfacing a sinking output with a sourcing input module 30
  31. 31. ISOLATED AC/DC INPUTSIsolated input interfaces operate like standard AC/DC modulesexcept that each input has a separate return, or common, line. 31
  32. 32. TTL INPUTSTransistor-transistor logic (TTL) input interfaces allow controllersto accept signals from TTL-compatible devices, such as solid-statecontrols and sensing instruments. 32
  33. 33. REGISTER/BCD INPUTS•Multibit register/BCD input modules enhance input interfacingmethods with the programmable controller through the use ofstandard thumbwheel switches.•This register, or BCD, configuration allows groups of bits to beinput as a unit to accommodate devices requiring that bits be inparallel form. 33
  34. 34. DISCRETE OUTPUTS 34
  35. 35. AC OUTPUT Circuit Block Diagram 35
  36. 36. AC output module connection diagram 36
  37. 37. DC OUTPUTS (SINK/SOURCE) 37
  38. 38. ISOLATED AC AND DC OUTPUTS 38
  39. 39. TTL OUTPUTS 39
  40. 40. REGISTER/BCD OUTPUTS 40
  41. 41. CONTACT OUTPUTS 41
  42. 42. DISCRETE BYPASS/CONTROL STATIONS 42
  43. 43. 43
  44. 44. 44
  45. 45. 45
  46. 46. 46
  47. 47. 47
  48. 48. 48
  49. 49. 49
  50. 50. 50
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