- •1.1 TODO LIST
- •2. PROGRAMMABLE LOGIC CONTROLLERS
- •2.1 INTRODUCTION
- •2.1.1 Ladder Logic
- •2.1.2 Programming
- •2.1.3 PLC Connections
- •2.1.4 Ladder Logic Inputs
- •2.1.5 Ladder Logic Outputs
- •2.2 A CASE STUDY
- •2.3 SUMMARY
- •2.4 PRACTICE PROBLEMS
- •2.5 PRACTICE PROBLEM SOLUTIONS
- •2.6 ASSIGNMENT PROBLEMS
- •3. PLC HARDWARE
- •3.1 INTRODUCTION
- •3.2 INPUTS AND OUTPUTS
- •3.2.1 Inputs
- •3.2.2 Output Modules
- •3.3 RELAYS
- •3.4 A CASE STUDY
- •3.5 ELECTRICAL WIRING DIAGRAMS
- •3.5.1 JIC Wiring Symbols
- •3.6 SUMMARY
- •3.7 PRACTICE PROBLEMS
- •3.8 PRACTICE PROBLEM SOLUTIONS
- •3.9 ASSIGNMENT PROBLEMS
- •4. LOGICAL SENSORS
- •4.1 INTRODUCTION
- •4.2 SENSOR WIRING
- •4.2.1 Switches
- •4.2.2 Transistor Transistor Logic (TTL)
- •4.2.3 Sinking/Sourcing
- •4.2.4 Solid State Relays
- •4.3 PRESENCE DETECTION
- •4.3.1 Contact Switches
- •4.3.2 Reed Switches
- •4.3.3 Optical (Photoelectric) Sensors
- •4.3.4 Capacitive Sensors
- •4.3.5 Inductive Sensors
- •4.3.6 Ultrasonic
- •4.3.7 Hall Effect
- •4.3.8 Fluid Flow
- •4.4 SUMMARY
- •4.5 PRACTICE PROBLEMS
- •4.6 PRACTICE PROBLEM SOLUTIONS
- •4.7 ASSIGNMENT PROBLEMS
- •5. LOGICAL ACTUATORS
- •5.1 INTRODUCTION
- •5.2 SOLENOIDS
- •5.3 VALVES
- •5.4 CYLINDERS
- •5.5 HYDRAULICS
- •5.6 PNEUMATICS
- •5.7 MOTORS
- •5.8 COMPUTERS
- •5.9 OTHERS
- •5.10 SUMMARY
- •5.11 PRACTICE PROBLEMS
- •5.12 PRACTICE PROBLEM SOLUTIONS
- •5.13 ASSIGNMENT PROBLEMS
- •6. BOOLEAN LOGIC DESIGN
- •6.1 INTRODUCTION
- •6.2 BOOLEAN ALGEBRA
- •6.3 LOGIC DESIGN
- •6.3.1 Boolean Algebra Techniques
- •6.4 COMMON LOGIC FORMS
- •6.4.1 Complex Gate Forms
- •6.4.2 Multiplexers
- •6.5 SIMPLE DESIGN CASES
- •6.5.1 Basic Logic Functions
- •6.5.2 Car Safety System
- •6.5.3 Motor Forward/Reverse
- •6.5.4 A Burglar Alarm
- •6.6 SUMMARY
- •6.7 PRACTICE PROBLEMS
- •6.8 PRACTICE PROBLEM SOLUTIONS
- •6.9 ASSIGNMENT PROBLEMS
- •7. KARNAUGH MAPS
- •7.1 INTRODUCTION
- •7.2 SUMMARY
- •7.3 PRACTICE PROBLEMS
- •7.4 PRACTICE PROBLEM SOLUTIONS
- •7.5 ASSIGNMENT PROBLEMS
- •8. PLC OPERATION
- •8.1 INTRODUCTION
- •8.2 OPERATION SEQUENCE
- •8.2.1 The Input and Output Scans
- •8.2.2 The Logic Scan
- •8.3 PLC STATUS
- •8.4 MEMORY TYPES
- •8.5 SOFTWARE BASED PLCS
- •8.6 SUMMARY
- •8.7 PRACTICE PROBLEMS
- •8.8 PRACTICE PROBLEM SOLUTIONS
- •8.9 ASSIGNMENT PROBLEMS
- •9. LATCHES, TIMERS, COUNTERS AND MORE
- •9.1 INTRODUCTION
- •9.2 LATCHES
- •9.3 TIMERS
- •9.4 COUNTERS
- •9.5 MASTER CONTROL RELAYS (MCRs)
- •9.6 INTERNAL RELAYS
- •9.7 DESIGN CASES
- •9.7.1 Basic Counters And Timers
- •9.7.2 More Timers And Counters
- •9.7.3 Deadman Switch
- •9.7.4 Conveyor
- •9.7.5 Accept/Reject Sorting
- •9.7.6 Shear Press
- •9.8 SUMMARY
- •9.9 PRACTICE PROBLEMS
- •9.10 PRACTICE PROBLEM SOLUTIONS
- •9.11 ASSIGNMENT PROBLEMS
- •10. STRUCTURED LOGIC DESIGN
- •10.1 INTRODUCTION
- •10.2 PROCESS SEQUENCE BITS
- •10.3 TIMING DIAGRAMS
- •10.4 DESIGN CASES
- •10.5 SUMMARY
- •10.6 PRACTICE PROBLEMS
- •10.7 PRACTICE PROBLEM SOLUTIONS
- •10.8 ASSIGNMENT PROBLEMS
- •11. FLOWCHART BASED DESIGN
- •11.1 INTRODUCTION
- •11.2 BLOCK LOGIC
- •11.3 SEQUENCE BITS
- •11.4 SUMMARY
- •11.5 PRACTICE PROBLEMS
- •11.6 PRACTICE PROBLEM SOLUTIONS
- •11.7 ASSIGNMENT PROBLEMS
- •12. STATE BASED DESIGN
- •12.1 INTRODUCTION
- •12.1.1 State Diagram Example
- •12.1.2 Conversion to Ladder Logic
- •12.1.2.1 - Block Logic Conversion
- •12.1.2.2 - State Equations
- •12.1.2.3 - State-Transition Equations
- •12.2 SUMMARY
- •12.3 PRACTICE PROBLEMS
- •12.4 PRACTICE PROBLEM SOLUTIONS
- •12.5 ASSIGNMENT PROBLEMS
- •13. NUMBERS AND DATA
- •13.1 INTRODUCTION
- •13.2 NUMERICAL VALUES
- •13.2.1 Binary
- •13.2.1.1 - Boolean Operations
- •13.2.1.2 - Binary Mathematics
- •13.2.2 Other Base Number Systems
- •13.2.3 BCD (Binary Coded Decimal)
- •13.3 DATA CHARACTERIZATION
- •13.3.1 ASCII (American Standard Code for Information Interchange)
- •13.3.2 Parity
- •13.3.3 Checksums
- •13.3.4 Gray Code
- •13.4 SUMMARY
- •13.5 PRACTICE PROBLEMS
- •13.6 PRACTICE PROBLEM SOLUTIONS
- •13.7 ASSIGNMENT PROBLEMS
- •14. PLC MEMORY
- •14.1 INTRODUCTION
- •14.2 MEMORY ADDRESSES
- •14.3 PROGRAM FILES
- •14.4 DATA FILES
- •14.4.1 User Bit Memory
- •14.4.2 Timer Counter Memory
- •14.4.3 PLC Status Bits (for PLC-5s and Micrologix)
- •14.4.4 User Function Control Memory
- •14.4.5 Integer Memory
- •14.4.6 Floating Point Memory
- •14.5 SUMMARY
- •14.6 PRACTICE PROBLEMS
- •14.7 PRACTICE PROBLEM SOLUTIONS
- •14.8 ASSIGNMENT PROBLEMS
- •15. LADDER LOGIC FUNCTIONS
- •15.1 INTRODUCTION
- •15.2 DATA HANDLING
- •15.2.1 Move Functions
- •15.2.2 Mathematical Functions
- •15.2.3 Conversions
- •15.2.4 Array Data Functions
- •15.2.4.1 - Statistics
- •15.2.4.2 - Block Operations
- •15.3 LOGICAL FUNCTIONS
- •15.3.1 Comparison of Values
- •15.3.2 Boolean Functions
- •15.4 DESIGN CASES
- •15.4.1 Simple Calculation
- •15.4.2 For-Next
- •15.4.3 Series Calculation
- •15.4.4 Flashing Lights
- •15.5 SUMMARY
- •15.6 PRACTICE PROBLEMS
- •15.7 PRACTICE PROBLEM SOLUTIONS
- •15.8 ASSIGNMENT PROBLEMS
- •16. ADVANCED LADDER LOGIC FUNCTIONS
- •16.1 INTRODUCTION
- •16.2 LIST FUNCTIONS
- •16.2.1 Shift Registers
- •16.2.2 Stacks
- •16.2.3 Sequencers
- •16.3 PROGRAM CONTROL
- •16.3.1 Branching and Looping
- •16.3.2 Fault Detection and Interrupts
- •16.4 INPUT AND OUTPUT FUNCTIONS
- •16.4.1 Immediate I/O Instructions
- •16.4.2 Block Transfer Functions
- •16.5 DESIGN TECHNIQUES
- •16.5.1 State Diagrams
- •16.6 DESIGN CASES
- •16.6.1 If-Then
- •16.6.2 Traffic Light
- •16.7 SUMMARY
- •16.8 PRACTICE PROBLEMS
- •16.9 PRACTICE PROBLEM SOLUTIONS
- •16.10 ASSIGNMENT PROBLEMS
- •17. OPEN CONTROLLERS
- •17.1 INTRODUCTION
- •17.3 OPEN ARCHITECTURE CONTROLLERS
- •17.4 SUMMARY
- •17.5 PRACTICE PROBLEMS
- •17.6 PRACTICE PROBLEM SOLUTIONS
- •17.7 ASSIGNMENT PROBLEMS
- •18. INSTRUCTION LIST PROGRAMMING
- •18.1 INTRODUCTION
- •18.2 THE IEC 61131 VERSION
- •18.3 THE ALLEN-BRADLEY VERSION
- •18.4 SUMMARY
- •18.5 PRACTICE PROBLEMS
- •18.6 PRACTICE PROBLEM SOLUTIONS
- •18.7 ASSIGNMENT PROBLEMS
- •19. STRUCTURED TEXT PROGRAMMING
- •19.1 INTRODUCTION
- •19.2 THE LANGUAGE
- •19.3 SUMMARY
- •19.4 PRACTICE PROBLEMS
- •19.5 PRACTICE PROBLEM SOLUTIONS
- •19.6 ASSIGNMENT PROBLEMS
- •20. SEQUENTIAL FUNCTION CHARTS
- •20.1 INTRODUCTION
- •20.2 A COMPARISON OF METHODS
- •20.3 SUMMARY
- •20.4 PRACTICE PROBLEMS
- •20.5 PRACTICE PROBLEM SOLUTIONS
- •20.6 ASSIGNMENT PROBLEMS
- •21. FUNCTION BLOCK PROGRAMMING
- •21.1 INTRODUCTION
- •21.2 CREATING FUNCTION BLOCKS
- •21.3 DESIGN CASE
- •21.4 SUMMARY
- •21.5 PRACTICE PROBLEMS
- •21.6 PRACTICE PROBLEM SOLUTIONS
- •21.7 ASSIGNMENT PROBLEMS
- •22. ANALOG INPUTS AND OUTPUTS
- •22.1 INTRODUCTION
- •22.2 ANALOG INPUTS
- •22.2.1 Analog Inputs With a PLC
- •22.3 ANALOG OUTPUTS
- •22.3.1 Analog Outputs With A PLC
- •22.3.2 Pulse Width Modulation (PWM) Outputs
- •22.3.3 Shielding
- •22.4 DESIGN CASES
- •22.4.1 Process Monitor
- •22.5 SUMMARY
- •22.6 PRACTICE PROBLEMS
- •22.7 PRACTICE PROBLEM SOLUTIONS
- •22.8 ASSIGNMENT PROBLEMS
- •23. CONTINUOUS SENSORS
- •23.1 INTRODUCTION
- •23.2 INDUSTRIAL SENSORS
- •23.2.1 Angular Displacement
- •23.2.1.1 - Potentiometers
- •23.2.2 Encoders
- •23.2.2.1 - Tachometers
- •23.2.3 Linear Position
- •23.2.3.1 - Potentiometers
- •23.2.3.2 - Linear Variable Differential Transformers (LVDT)
- •23.2.3.3 - Moire Fringes
- •23.2.3.4 - Accelerometers
- •23.2.4 Forces and Moments
- •23.2.4.1 - Strain Gages
- •23.2.4.2 - Piezoelectric
- •23.2.5 Liquids and Gases
- •23.2.5.1 - Pressure
- •23.2.5.2 - Venturi Valves
- •23.2.5.3 - Coriolis Flow Meter
- •23.2.5.4 - Magnetic Flow Meter
- •23.2.5.5 - Ultrasonic Flow Meter
- •23.2.5.6 - Vortex Flow Meter
- •23.2.5.7 - Positive Displacement Meters
- •23.2.5.8 - Pitot Tubes
- •23.2.6 Temperature
- •23.2.6.1 - Resistive Temperature Detectors (RTDs)
- •23.2.6.2 - Thermocouples
- •23.2.6.3 - Thermistors
- •23.2.6.4 - Other Sensors
- •23.2.7 Light
- •23.2.7.1 - Light Dependant Resistors (LDR)
- •23.2.8 Chemical
- •23.2.8.2 - Conductivity
- •23.2.9 Others
- •23.3 INPUT ISSUES
- •23.4 SENSOR GLOSSARY
- •23.5 SUMMARY
- •23.6 REFERENCES
- •23.7 PRACTICE PROBLEMS
- •23.8 PRACTICE PROBLEM SOLUTIONS
- •23.9 ASSIGNMENT PROBLEMS
- •24. CONTINUOUS ACTUATORS
- •24.1 INTRODUCTION
- •24.2 ELECTRIC MOTORS
- •24.2.1 Basic Brushed DC Motors
- •24.2.2 AC Motors
- •24.2.3 Brushless DC Motors
- •24.2.4 Stepper Motors
- •24.2.5 Wound Field Motors
- •24.3 HYDRAULICS
- •24.4 OTHER SYSTEMS
- •24.5 SUMMARY
- •24.6 PRACTICE PROBLEMS
- •24.7 PRACTICE PROBLEM SOLUTIONS
- •24.8 ASSIGNMENT PROBLEMS
- •25. CONTINUOUS CONTROL
- •25.1 INTRODUCTION
- •25.2 CONTROL OF LOGICAL ACTUATOR SYSTEMS
- •25.3 CONTROL OF CONTINUOUS ACTUATOR SYSTEMS
- •25.3.1 Block Diagrams
- •25.3.2 Feedback Control Systems
- •25.3.3 Proportional Controllers
- •25.3.4 PID Control Systems
- •25.4 DESIGN CASES
- •25.4.1 Oven Temperature Control
- •25.4.2 Water Tank Level Control
- •25.5 SUMMARY
- •25.6 PRACTICE PROBLEMS
- •25.7 PRACTICE PROBLEM SOLUTIONS
- •25.8 ASSIGNMENT PROBLEMS
- •26. FUZZY LOGIC
- •26.1 INTRODUCTION
- •26.2 COMMERCIAL CONTROLLERS
- •26.3 REFERENCES
- •26.4 SUMMARY
- •26.5 PRACTICE PROBLEMS
- •26.6 PRACTICE PROBLEM SOLUTIONS
- •26.7 ASSIGNMENT PROBLEMS
- •27. SERIAL COMMUNICATION
- •27.1 INTRODUCTION
- •27.2 SERIAL COMMUNICATIONS
- •27.2.1.1 - ASCII Functions
- •27.3 PARALLEL COMMUNICATIONS
- •27.4 DESIGN CASES
- •27.4.1 PLC Interface To a Robot
- •27.5 SUMMARY
- •27.6 PRACTICE PROBLEMS
- •27.7 PRACTICE PROBLEM SOLUTIONS
- •27.8 ASSIGNMENT PROBLEMS
- •28. NETWORKING
- •28.1 INTRODUCTION
- •28.1.1 Topology
- •28.1.2 OSI Network Model
- •28.1.3 Networking Hardware
- •28.1.4 Control Network Issues
- •28.2 NETWORK STANDARDS
- •28.2.1 Devicenet
- •28.2.2 CANbus
- •28.2.3 Controlnet
- •28.2.4 Ethernet
- •28.2.5 Profibus
- •28.2.6 Sercos
- •28.3 PROPRIETARY NETWORKS
- •28.3.1 Data Highway
- •28.4 NETWORK COMPARISONS
- •28.5 DESIGN CASES
- •28.5.1 Devicenet
- •28.6 SUMMARY
- •28.7 PRACTICE PROBLEMS
- •28.8 PRACTICE PROBLEM SOLUTIONS
- •28.9 ASSIGNMENT PROBLEMS
- •29. INTERNET
- •29.1 INTRODUCTION
- •29.1.1 Computer Addresses
- •29.1.2 Phone Lines
- •29.1.3 Mail Transfer Protocols
- •29.1.4 FTP - File Transfer Protocol
- •29.1.5 HTTP - Hypertext Transfer Protocol
- •29.1.6 Novell
- •29.1.7 Security
- •29.1.7.1 - Firewall
- •29.1.7.2 - IP Masquerading
- •29.1.8 HTML - Hyper Text Markup Language
- •29.1.9 URLs
- •29.1.10 Encryption
- •29.1.11 Compression
- •29.1.12 Clients and Servers
- •29.1.13 Java
- •29.1.14 Javascript
- •29.1.16 ActiveX
- •29.1.17 Graphics
- •29.2 DESIGN CASES
- •29.2.1 Remote Monitoring System
- •29.3 SUMMARY
- •29.4 PRACTICE PROBLEMS
- •29.5 PRACTICE PROBLEM SOLUTIONS
- •29.6 ASSIGNMENT PROBLEMS
- •30. HUMAN MACHINE INTERFACES (HMI)
- •30.1 INTRODUCTION
- •30.2 HMI/MMI DESIGN
- •30.3 DESIGN CASES
- •30.4 SUMMARY
- •30.5 PRACTICE PROBLEMS
- •30.6 PRACTICE PROBLEM SOLUTIONS
- •30.7 ASSIGNMENT PROBLEMS
- •31. ELECTRICAL DESIGN AND CONSTRUCTION
- •31.1 INTRODUCTION
- •31.2 ELECTRICAL WIRING DIAGRAMS
- •31.2.1 Selecting Voltages
- •31.2.2 Grounding
- •31.2.3 Wiring
- •31.2.4 Suppressors
- •31.2.5 PLC Enclosures
- •31.2.6 Wire and Cable Grouping
- •31.3 FAIL-SAFE DESIGN
- •31.4 SAFETY RULES SUMMARY
- •31.5 REFERENCES
- •31.6 SUMMARY
- •31.7 PRACTICE PROBLEMS
- •31.8 PRACTICE PROBLEM SOLUTIONS
- •31.9 ASSIGNMENT PROBLEMS
- •32. SOFTWARE ENGINEERING
- •32.1 INTRODUCTION
- •32.1.1 Fail Safe Design
- •32.2 DEBUGGING
- •32.2.1 Troubleshooting
- •32.2.2 Forcing
- •32.3 PROCESS MODELLING
- •32.4 PROGRAMMING FOR LARGE SYSTEMS
- •32.4.1 Developing a Program Structure
- •32.4.2 Program Verification and Simulation
- •32.5 DOCUMENTATION
- •32.6 COMMISIONING
- •32.7 REFERENCES
- •32.8 SUMMARY
- •32.9 PRACTICE PROBLEMS
- •32.10 PRACTICE PROBLEM SOLUTIONS
- •32.11 ASSIGNMENT PROBLEMS
- •33. SELECTING A PLC
- •33.1 INTRODUCTION
- •33.2 SPECIAL I/O MODULES
- •33.3 SUMMARY
- •33.4 PRACTICE PROBLEMS
- •33.5 PRACTICE PROBLEM SOLUTIONS
- •33.6 ASSIGNMENT PROBLEMS
- •34. FUNCTION REFERENCE
- •34.1 FUNCTION DESCRIPTIONS
- •34.1.1 General Functions
- •34.1.2 Program Control
- •34.1.3 Timers and Counters
- •34.1.4 Compare
- •34.1.5 Calculation and Conversion
- •34.1.6 Logical
- •34.1.7 Move
- •34.1.8 File
- •34.1.10 Program Control
- •34.1.11 Advanced Input/Output
- •34.1.12 String
- •34.2 DATA TYPES
- •35. COMBINED GLOSSARY OF TERMS
- •36. PLC REFERENCES
- •36.1 SUPPLIERS
- •36.2 PROFESSIONAL INTEREST GROUPS
- •36.3 PLC/DISCRETE CONTROL REFERENCES
- •37. GNU Free Documentation License
- •37.1 PREAMBLE
- •37.2 APPLICABILITY AND DEFINITIONS
- •37.3 VERBATIM COPYING
- •37.4 COPYING IN QUANTITY
- •37.5 MODIFICATIONS
- •37.6 COMBINING DOCUMENTS
- •37.7 COLLECTIONS OF DOCUMENTS
- •37.8 AGGREGATION WITH INDEPENDENT WORKS
- •37.9 TRANSLATION
- •37.10 TERMINATION
- •37.11 FUTURE REVISIONS OF THIS LICENSE
- •37.12 How to use this License for your documents
plc software - 32.12
2.A basic model of the system is developed in terms of the inputs and outputs. This might include items such as when sensor changes are expected, what effects actuators should have, and expected operator inputs.
3.A system simulator is constructed with some combination of specialized software and hardware.
4.The system is verified for the expect operation of the system.
5.The system is then used for testing software and verifying the operation.
A detailed description of simulator usage is available [Kinner, 1992].
32.5 DOCUMENTATION
Poor documentation is a common complaint lodged against control system designers. Good documentation is developed as a project progresses. Many engineers will leave the documentation to the end of a project as an afterthought. But, by that point many of the details have been forgotten. So, it takes longer to recall the details of the work, and the report is always lacking.
A set of PLC design forms are given in Figure 32.6 to Figure 32.12. These can be used before, during and after a controls project. These forms can then be kept in design or maintenance offices so that others can get easy access and make updates at the controller is changed. Figure 32.6 shows a design cover page. This should be completed with information such as a unique project name, contact person, and controller type. The list of changes below help to track design, redesign and maintenance that has been done to the machine. This cover sheet acts as a quick overview on the history of the machine. Figure 32.7 to Figure 32.9 show sheets that allow free form planning of the design. Figure 32.10 shows a sheet for planning the input and output memory locations. Figure 32.11 shows a sheet for planning internal memory locations, and finally Figure 32.12 shows a sheet for planning the ladder logic. The sheets should be used in the order they are given, but they do not all need to be used. When the system has been built and tested, a copy of the working ladder logic should be attached to the end of the bundle of pages.
plc software - 32.13
PLC Project Sheet
Project ID:
Start Date:
Contact Person:
PLC Model:
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Figure 32.6 Design Cover Page
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Figure 32.7 Project Note Page
plc software - 32.15
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Design Notes |
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State Diagram |
Truth Table |
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Flow Chart |
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Sequential Function Chart |
Communications |
Name: |
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Boolean Equations |
Other Notes |
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Figure 32.8 Project Diagramming Page
plc software - 32.16
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Application Notes |
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Test Plan |
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PLC Modules |
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Other Notes |
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Figure 32.9 Project Diagramming and Notes Page
plc software - 32.17
Input/Output Card |
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Card Type |
Notes: |
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Vin |
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Figure 32.10 IO Planning Page
plc software - 32.18
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Internal Locations |
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Figure 32.11 Internal Memory Locations Page
plc software - 32.19
Project I.D. |
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Figure 32.12 Ladder Logic Page